Document and Entity Information - shares shares in Thousands	3 Months Ended
	Dec. 29, 2018	Jan. 18, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 29, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	AAPL
Entity Registrant Name	APPLE INC
Entity Central Index Key	0000320193
Current Fiscal Year End Date	--09-28
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		4,715,280

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Net sales	$ 84,310	$ 88,293
Cost of sales	52,279	54,381
Gross margin	32,031	33,912
Operating expenses:
Research and development	3,902	3,407
Selling, general and administrative	4,783	4,231
Total operating expenses	8,685	7,638
Operating income	23,346	26,274
Other income/(expense), net	560	756
Income before provision for income taxes	23,906	27,030
Provision for income taxes	3,941	6,965
Net income	$ 19,965	$ 20,065
Earnings per share:
Basic (in dollars per share)	$ 4.22	$ 3.92
Diluted (in dollars per share)	$ 4.18	$ 3.89
Shares used in computing earnings per share:
Basic (in shares)	4,735,820	5,112,877
Diluted (in shares)	4,773,252	5,157,787
Products
Net sales	$ 73,435	$ 79,164
Cost of sales	48,238	50,575
Services
Net sales	10,875	9,129
Cost of sales	$ 4,041	$ 3,806

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 19,965	$ 20,065
Other comprehensive income/(loss):
Change in foreign currency translation, net of tax	(78)	40
Change in unrealized gains/losses on derivative instruments, net of tax:
Change in fair value of derivatives	(334)	88
Adjustment for net (gains)/losses realized and included in net income	42	102
Total change in unrealized gains/losses on derivative instruments	(292)	190
Change in unrealized gains/losses on marketable securities, net of tax:
Change in fair value of marketable securities	110	(846)
Adjustment for net (gains)/losses realized and included in net income	37	(75)
Total change in unrealized gains/losses on marketable securities	147	(921)
Total other comprehensive income/(loss)	(223)	(691)
Total comprehensive income	$ 19,742	$ 19,374

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018
Current assets:
Cash and cash equivalents	$ 44,771	$ 25,913
Marketable securities	41,656	40,388
Accounts receivable, net	18,077	23,186
Inventories	4,988	3,956
Vendor non-trade receivables	18,904	25,809
Other current assets	12,432	12,087
Total current assets	140,828	131,339
Non-current assets:
Marketable securities	158,608	170,799
Property, plant and equipment, net	39,597	41,304
Other non-current assets	34,686	22,283
Total non-current assets	232,891	234,386
Total assets	373,719	365,725
Current liabilities:
Accounts payable	44,293	55,888
Other current liabilities	36,703	33,327
Deferred revenue	5,546	5,966
Commercial paper	11,969	11,964
Term debt	9,772	8,784
Total current liabilities	108,283	115,929
Non-current liabilities:
Term debt	92,989	93,735
Other non-current liabilities	54,555	48,914
Total non-current liabilities	147,544	142,649
Total liabilities	255,827	258,578
Commitments and contingencies
Shareholders’ equity:
Common stock and additional paid-in capital, $0.00001 par value: 12,600,000 shares authorized; 4,729,803 and 4,754,986 shares issued and outstanding, respectively	40,970	40,201
Retained earnings	80,510	70,400
Accumulated other comprehensive income/(loss)	(3,588)	(3,454)
Total shareholders’ equity	117,892	107,147
Total liabilities and shareholders’ equity	$ 373,719	$ 365,725

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Dec. 29, 2018	Sep. 29, 2018
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	12,600,000,000	12,600,000,000
Common stock, shares issued (in shares)	4,729,803,000	4,754,986,000
Common stock, shares outstanding (in shares)	4,729,803,000	4,754,986,000

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income/(loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of changes in accounting principles			$ 0	$ 0
Beginning balances at Sep. 30, 2017	$ 134,047	$ 35,867	98,330	(150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld related to net share settlement of equity awards, net		(738)	(393)
Share-based compensation		1,318
Net income	20,065		20,065
Dividends and dividend equivalents declared			(3,300)
Common stock repurchased			(10,109)
Other comprehensive income/(loss)	(691)			(691)
Ending balances at Dec. 30, 2017	$ 140,199	36,447	104,593	(841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.63
Cumulative effect of changes in accounting principles			2,501	89
Beginning balances at Sep. 29, 2018	$ 107,147	40,201	70,400	(3,454)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld related to net share settlement of equity awards, net		(822)	(594)
Share-based compensation		1,591
Net income	19,965		19,965
Dividends and dividend equivalents declared			(3,526)
Common stock repurchased	(8,236)		(8,236)
Other comprehensive income/(loss)	(223)			(223)
Ending balances at Dec. 29, 2018	$ 117,892	$ 40,970	$ 80,510	$ (3,588)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.73

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents, beginning balances	$ 25,913	$ 20,289
Operating activities:
Net income	19,965	20,065
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	3,395	2,745
Share-based compensation expense	1,559	1,296
Deferred income tax expense/(benefit)	53	(33,737)
Other	(54)	(11)
Changes in operating assets and liabilities:
Accounts receivable, net	5,130	(5,570)
Inventories	(1,076)	434
Vendor non-trade receivables	6,905	(9,660)
Other current and non-current assets	(886)	(197)
Accounts payable	(8,501)	12,602
Deferred revenue	(370)	569
Other current and non-current liabilities	570	39,757
Cash generated by operating activities	26,690	28,293
Investing activities:
Purchases of marketable securities	(7,077)	(41,272)
Proceeds from maturities of marketable securities	7,203	14,048
Proceeds from sales of marketable securities	9,723	16,801
Payments for acquisition of property, plant and equipment	(3,355)	(2,810)
Payments made in connection with business acquisitions, net	(167)	(173)
Purchases of non-marketable securities	(427)	(141)
Other	(56)	(43)
Cash generated by/(used in) investing activities	5,844	(13,590)
Financing activities:
Payments for taxes related to net share settlement of equity awards	(1,318)	(1,038)
Payments for dividends and dividend equivalents	(3,568)	(3,339)
Repurchases of common stock	(8,796)	(10,095)
Proceeds from issuance of term debt, net	0	6,969
Change in commercial paper, net	6	2
Cash used in financing activities	(13,676)	(7,501)
Increase/(Decrease) in cash and cash equivalents	18,858	7,202
Cash and cash equivalents, ending balances	44,771	27,491
Supplemental cash flow disclosure:
Cash paid for income taxes, net	4,916	3,551
Cash paid for interest	$ 836	$ 623

Summary of Significant Accounting Policies

3 Months Ended

Dec. 29, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Apple Inc. and its wholly-owned subsidiaries (collectively “Apple” or the “Company”) designs, manufactures and markets mobile communication and media devices and personal computers, and sells a variety of related software, services, accessories and third-party digital content and applications. The Company’s products and services include iPhone^®, Mac^®, iPad^®, Apple Watch^®, AirPods^®, Apple TV^®, HomePod™, a portfolio of consumer and professional software applications, iOS, macOS^®, watchOS^® and tvOS^® operating systems, iCloud^®, Apple Pay^® and a variety of accessory, service and support offerings. The Company sells and delivers digital content and applications through the iTunes Store^®, App Store^®, Mac App Store, TV App Store, Book Store and Apple Music^® (collectively “Digital Content and Services”). The Company sells its products worldwide through its retail stores, online stores and direct sales force, as well as through third-party cellular network carriers, wholesalers, retailers and resellers. In addition, the Company sells a variety of third-party Apple-compatible products, including application software and various accessories, through its retail and online stores. The Company sells to consumers, small and mid-sized businesses and education, enterprise and government customers.

Basis of Presentation and Preparation

The accompanying condensed consolidated financial statements include the accounts of the Company. Intercompany accounts and transactions have been eliminated. In the opinion of the Company’s management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. The preparation of these condensed consolidated financial statements and accompanying notes in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ materially from those estimates. Certain prior period amounts in the condensed consolidated financial statements and accompanying notes have been reclassified to conform to the current period’s presentation. These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s annual consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the fiscal year ended September 29, 2018 (the “2018 Form 10-K”).

The Company’s fiscal year is the 52- or 53-week period that ends on the last Saturday of September. A 14th week is included in the first fiscal quarter every five or six years to realign the Company’s fiscal quarters with calendar quarters. The Company’s fiscal years 2019 and 2018 span 52 weeks each. Unless otherwise stated, references to particular years, quarters, months and periods refer to the Company’s fiscal years ended in September and the associated quarters, months and periods of those fiscal years.

Recently Adopted Accounting Pronouncements

Revenue Recognition

In the first quarter of 2019, the Company adopted the Financial Accounting Standards Board’s (the “FASB”) Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), and additional ASUs issued to clarify the guidance in ASU 2014-09 (collectively the “new revenue standard”), which amends the existing accounting standards for revenue recognition. The Company adopted the new revenue standard utilizing the full retrospective transition method. The Company did not restate total net sales in the prior periods presented, as adoption of the new revenue standard did not have a material impact on previously reported amounts.

Additionally, beginning in the first quarter of 2019, the Company classified the amortization of the deferred value of Maps, Siri^® and free iCloud services, which are bundled in the sales price of iPhone, Mac, iPad and certain other products, in Services net sales. Historically, the Company classified the amortization of these amounts in Products net sales consistent with its management reporting framework. As a result, Products and Services net sales information for the first quarter of 2018 was reclassified to conform to the 2019 presentation.

Financial Instruments

In the first quarter of 2019, the Company adopted FASB ASU No. 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”), which updates certain aspects of the recognition, measurement, presentation and disclosure of financial instruments. The adoption of ASU 2016-01 did not have a material impact on the Company’s condensed consolidated financial statements.

Income Taxes

In the first quarter of 2019, the Company adopted FASB ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”), which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The Company adopted ASU 2016-16 utilizing the modified retrospective transition method. Upon adoption, the Company recorded $2.7 billion of net deferred tax assets, reduced other non-current assets by $128 million, and increased retained earnings by $2.6 billion on its Condensed Consolidated Balance Sheet. The Company will recognize incremental deferred income tax expense as these net deferred tax assets are utilized.

Earnings Per Share

The following table shows the computation of basic and diluted earnings per share for the three months ended December 29, 2018 and December 30, 2017 (net income in millions and shares in thousands):



	Three Months Ended
	December 29, 2018		December 30, 2017
Numerator:
Net income	$	19,965	$	20,065

Denominator:
Weighted-average basic shares outstanding	4,735,820		5,112,877
Effect of dilutive securities	37,432		44,910
Weighted-average diluted shares	4,773,252		5,157,787

Basic earnings per share	$	4.22	$	3.92
Diluted earnings per share	$	4.18	$	3.89

Potentially dilutive securities representing 28.8 million shares of common stock were excluded from the computation of diluted earnings per share for the three months ended December 29, 2018 because their effect would have been antidilutive.

Revenue Recognition

3 Months Ended

Dec. 29, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Net sales consist of revenue from the sale of iPhone, Mac, iPad, services and other products. The Company recognizes revenue at the amount to which it expects to be entitled when control of the products or services is transferred to its customers. Control is generally transferred when the Company has a present right to payment and title and the significant risks and rewards of ownership of products or services are transferred to its customers. For most of the Company’s products net sales, control transfers when products are shipped. For the Company’s services net sales, control transfers over time as services are delivered. Payment for products and services net sales is collected within a short period of time following transfer of control or commencement of delivery of services, as applicable.

The Company records reductions to products net sales related to future product returns, price protection and other customer incentive programs based on the Company’s expectations and historical experience.

For arrangements with multiple performance obligations, which represent promises within an arrangement that are capable of being distinct, the Company allocates revenue to all distinct performance obligations based on their relative stand-alone selling prices (“SSP”). When available, the Company uses observable prices to determine the SSP. When observable prices are not available, SSPs are established that reflect the Company’s best estimates of what the selling prices of the performance obligations would be if they were sold regularly on a stand-alone basis. The Company’s process for estimating SSPs without observable prices considers multiple factors that may vary depending upon the unique facts and circumstances related to each performance obligation including, where applicable, prices charged by the Company for similar offerings, market trends in the pricing for similar offerings, product-specific business objectives and the estimated cost to provide the performance obligation.

The Company has identified up to three performance obligations regularly included in arrangements involving the sale of iPhone, Mac, iPad and certain other products. The first performance obligation, which represents the substantial portion of the allocated sales price, is the hardware and bundled software delivered at the time of sale. The second performance obligation is the right to receive certain product-related bundled services, which include iCloud, Siri and Maps. The third performance obligation is the right to receive, on a when-and-if-available basis, future unspecified software upgrades relating to the software bundled with each device. The Company allocates revenue and any related discounts to these performance obligations based on their relative SSPs. Because the Company lacks observable prices for the undelivered performance obligations, the allocation of revenue is based on the Company’s estimated SSPs. Revenue allocated to the delivered hardware and bundled software is recognized when control has transferred to the customer, which generally occurs when the product is shipped. Revenue allocated to the product-related bundled services and unspecified software upgrade rights is deferred and recognized on a straight-line basis over the estimated period they are expected to be provided. Cost of sales related to delivered hardware and bundled software, including estimated warranty costs, are recognized at the time of sale. Costs incurred to provide product-related bundled services and unspecified software upgrade rights are recognized as cost of sales as incurred.

For certain long-term service arrangements, the Company has performance obligations for services it has not yet delivered. For these arrangements, the Company does not have a right to bill for the undelivered services. The Company has determined that any unbilled consideration relates entirely to the value of the undelivered services. Accordingly, the Company has not recognized revenue, and has elected not to disclose amounts, related to these undelivered services.

For the sale of third-party products where the Company obtains control of the product before transferring it to the customer, the Company recognizes revenue based on the gross amount billed to customers. The Company considers multiple factors when determining whether it obtains control of third-party products including, but not limited to, evaluating if it has the ability to establish the price of the product, retains inventory risk for tangible products or has the responsibility for ensuring acceptability of the product. For third-party applications sold through the App Store, Mac App Store and TV App Store and certain digital content sold through the iTunes Store, the Company does not obtain control of the product before transferring it to the customer. Therefore, the Company accounts for such sales on a net basis by recognizing in services net sales only the commission it retains.

The Company has elected to record revenue net of taxes collected from customers that are remitted to governmental authorities, with the collected taxes recorded within other current liabilities until remitted to the relevant government authority.

Deferred Revenue

As of December 29, 2018 and September 29, 2018, the Company had total deferred revenue of $8.4 billion and $8.8 billion, respectively. As of December 29, 2018, the Company expects 66% of total deferred revenue to be realized in less than a year, 27% within one-to-two years, 6% within two-to-three years and 1% in greater than three years.

Disaggregated Revenue

Net sales disaggregated by significant products and services for the three months ended December 29, 2018 and December 30, 2017 were as follows (in millions):



	Three Months Ended
	December 29, 2018		December 30, 2017
iPhone⁽¹⁾	$	51,982	$	61,104
Mac ⁽¹⁾	7,416		6,824
iPad⁽¹⁾	6,729		5,755
Wearables, Home and Accessories ⁽¹⁾⁽²⁾	7,308		5,481
Services ⁽³⁾	10,875		9,129
Total net sales ⁽⁴⁾	$	84,310	$	88,293


(1)	Products net sales include amortization of the deferred value of unspecified software upgrade rights, which are bundled in the sales price of the respective product.


(2)	Wearables, Home and Accessories net sales include sales of AirPods, Apple TV, Apple Watch, Beats® products, HomePod, iPod touch® and Apple-branded and third-party accessories.


(3)	Services net sales include sales from Digital Content and Services, AppleCare®, Apple Pay, licensing and other services. Services net sales also include amortization of the deferred value of Maps, Siri and free iCloud services, which are bundled in the sales price of certain products.


(4)	Includes $2.4 billion and $2.0 billion of revenue recognized in the three months ended December 29, 2018 and December 30, 2017, respectively, that was included in deferred revenue at the beginning of each respective period.

The Company’s proportion of net sales by disaggregated revenue source was generally consistent for each reportable segment in Note 11, “Segment Information and Geographic Data” for the three months ended December 29, 2018 and December 30, 2017.

Financial Instruments

3 Months Ended

Dec. 29, 2018

Investments, All Other Investments [Abstract]

Financial Instruments

Cash, Cash Equivalents and Marketable Securities

The Company’s investments in marketable debt securities have been classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in other comprehensive income/(loss) (“OCI”).

The Company’s investments in mutual funds represent its only marketable equity securities and are classified as short-term based on the nature of the securities and their availability for use in current operations. The Company’s marketable equity securities are measured at fair value with gains and losses recognized in other income/(expense), net.

The following tables show the Company’s cash and marketable securities by significant investment category as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities
Cash	$	9,489	$	—	$	—		$	9,489	$	9,489	$	—	$	—

Level 1 ⁽¹⁾:
Money market funds	6,424		—		—			6,424		6,424		—		—
Mutual funds	682		—		—			682		—		682		—
Subtotal	7,106		—		—			7,106		6,424		682		—

Level 2 ⁽²⁾:
U.S. Treasury securities	46,191		6		(729		)	45,468		3,923		6,415		35,130
U.S. agency securities	9,731		—		(31		)	9,700		7,552		597		1,551
Non-U.S. government securities	23,460		48		(289		)	23,219		1,895		4,129		17,195
Certificates of deposit and time deposits	5,349		—		—			5,349		3,705		1,348		296
Commercial paper	11,953		—		—			11,953		11,679		274		—
Corporate debt securities	117,260		32		(2,387		)	114,905		104		27,134		87,667
Municipal securities	953		1		(7		)	947		—		187		760
Mortgage- and asset-backed securities	17,320		7		(428		)	16,899		—		890		16,009
Subtotal	232,217		94		(3,871		)	228,440		28,858		40,974		158,608

Total ⁽³⁾	$	248,812	$	94	$	(3,871	)	$	245,035	$	44,771	$	41,656	$	158,608



	September 29, 2018
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities
Cash	$	11,575	$	—	$	—		$	11,575	$	11,575	$	—	$	—

Level 1 ⁽¹⁾:
Money market funds	8,083		—		—			8,083		8,083		—		—
Mutual funds	799		—		(116		)	683		—		683		—
Subtotal	8,882		—		(116		)	8,766		8,083		683		—

Level 2 ⁽²⁾:
U.S. Treasury securities	47,296		—		(1,202		)	46,094		1,613		7,606		36,875
U.S. agency securities	4,127		—		(48		)	4,079		1,732		360		1,987
Non-U.S. government securities	21,601		49		(250		)	21,400		—		3,355		18,045
Certificates of deposit and time deposits	3,074		—		—			3,074		1,247		1,330		497
Commercial paper	2,573		—		—			2,573		1,663		910		—
Corporate debt securities	123,001		152		(2,038		)	121,115		—		25,162		95,953
Municipal securities	946		—		(12		)	934		—		178		756
Mortgage- and asset-backed securities	18,105		8		(623		)	17,490		—		804		16,686
Subtotal	220,723		209		(4,173		)	216,759		6,255		39,705		170,799

Total ⁽³⁾	$	241,180	$	209	$	(4,289	)	$	237,100	$	25,913	$	40,388	$	170,799


(1)	Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities.


(2)	Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.


(3)	As of December 29, 2018 and September 29, 2018, total cash, cash equivalents and marketable securities included $19.9 billion and $20.3 billion, respectively, that was restricted from general use, related to the State Aid Decision (refer to Note 5, “Income Taxes”) and other agreements.

The Company may sell certain of its marketable debt securities prior to their stated maturities for reasons including, but not limited to, managing liquidity, credit risk, duration and asset allocation. The maturities of the Company’s long-term marketable debt securities generally range from one to five years.

The following tables show information about the Company’s marketable securities that had been in a continuous unrealized loss position for less than 12 months and for 12 months or greater as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018
	Continuous Unrealized Losses
	Less than 12 Months			12 Months or Greater			Total
Fair value of marketable debt securities	$	53,336		$	127,006		$	180,342
Unrealized losses	$	(1,153	)	$	(2,718	)	$	(3,871	)



	September 29, 2018
	Continuous Unrealized Losses
	Less than 12 Months			12 Months or Greater			Total
Fair value of marketable securities	$	126,238		$	60,599		$	186,837
Unrealized losses	$	(2,400	)	$	(1,889	)	$	(4,289	)

The Company typically invests in highly rated securities, with the primary objective of minimizing the potential risk of principal loss. The Company’s investment policy generally requires securities to be investment grade and limits the amount of credit exposure to any one issuer. Fair values were determined for each individual security in the investment portfolio. When evaluating a marketable debt security for other-than-temporary impairment, the Company reviews factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates and the Company’s intent to sell, or whether it is more likely than not it will be required to sell the security before recovery of the security’s cost basis. As of December 29, 2018, the Company does not consider any of its marketable debt securities to be other-than-temporarily impaired.

Non-Marketable Securities

The Company holds non-marketable equity securities of certain privately held companies without readily determinable fair values, and has elected to apply the measurement alternative. As such, the Company’s non-marketable equity securities are measured at cost, less any impairment, and are adjusted for changes in fair value resulting from observable transactions for identical or similar investments of the same issuer. Gains and losses on non-marketable equity securities are recognized in other income/(expense), net. As of December 29, 2018, the Company’s non-marketable equity securities had a carrying value of $2.2 billion.

The Company holds a non-marketable debt security that is classified and accounted for as held-to-maturity. As of December 29, 2018, the Company’s non-marketable debt security had an amortized cost basis and carrying value of $1.5 billion.

Derivative Financial Instruments

The Company may use derivatives to partially offset its business exposure to foreign currency and interest rate risk on expected future cash flows, net investments in certain foreign subsidiaries, and certain existing assets and liabilities. However, the Company may choose not to hedge certain exposures for a variety of reasons including, but not limited to, accounting considerations or the prohibitive economic cost of hedging particular exposures. There can be no assurance the hedges will offset more than a portion of the financial impact resulting from movements in foreign currency exchange or interest rates.

To protect gross margins from fluctuations in foreign currency exchange rates, certain of the Company’s subsidiaries whose functional currency is the U.S. dollar may hedge a portion of forecasted foreign currency revenue, and subsidiaries whose functional currency is not the U.S. dollar may hedge a portion of forecasted inventory purchases not denominated in the subsidiaries’ functional currencies. The Company may enter into forward contracts, option contracts or other instruments to manage this risk and may designate these instruments as cash flow hedges. The Company generally hedges portions of its forecasted foreign currency exposure associated with revenue and inventory purchases, typically for up to 12 months.

To protect the net investment in a foreign operation from fluctuations in foreign currency exchange rates, the Company may enter into foreign currency forward and option contracts to offset a portion of the changes in the carrying amounts of these investments due to fluctuations in foreign currency exchange rates. In addition, the Company may use non-derivative financial instruments, such as its foreign currency–denominated debt, as hedges of its net investments in certain foreign subsidiaries. In both of these cases, the Company designates these instruments as net investment hedges.

To protect the Company’s foreign currency–denominated term debt or marketable securities from fluctuations in foreign currency exchange rates, the Company may enter into forward contracts, cross-currency swaps or other instruments. These instruments may offset a portion of the foreign currency remeasurement gains or losses, or changes in fair value. The Company may designate these instruments as either cash flow or fair value hedges. As of December 29, 2018, the Company’s hedged term debt– and marketable securities–related foreign currency transactions are expected to be recognized within 24 years.

The Company may also enter into non-designated foreign currency contracts to offset a portion of the foreign currency exchange gains and losses generated by the remeasurement of certain assets and liabilities denominated in non-functional currencies.

To protect the Company’s foreign currency–denominated term debt or marketable securities from fluctuations in interest rates, the Company may enter into interest rate swaps, options or other instruments. These instruments may offset a portion of the changes in interest income or expense, or changes in fair value. The Company designates these instruments as either cash flow or fair value hedges. As of December 29, 2018, the Company’s hedged interest rate transactions are expected to be recognized within 9 years.

Cash Flow Hedges

The effective portions of cash flow hedges are recorded in accumulated other comprehensive income/(loss) (“AOCI”) until the hedged item is recognized in earnings. Deferred gains and losses associated with cash flow hedges of foreign currency revenue are recognized as a component of net sales in the same period as the related revenue is recognized, and deferred gains and losses related to cash flow hedges of inventory purchases are recognized as a component of cost of sales in the same period as the related costs are recognized. Deferred gains and losses associated with cash flow hedges of interest income or expense are recognized in other income/(expense), net in the same period as the related income or expense is recognized. For options designated as cash flow hedges, changes in the time value are excluded from the assessment of hedge effectiveness. The ineffective portions and amounts excluded from the effectiveness testing of cash flow hedges are recognized in other income/(expense), net.

Derivative instruments designated as cash flow hedges must be de-designated as hedges when it is probable the forecasted hedged transaction will not occur in the initially identified time period or within a subsequent two-month time period. Deferred gains and losses in AOCI associated with such derivative instruments are reclassified into other income/(expense), net in the period of de-designation. Any subsequent changes in fair value of such derivative instruments are reflected in other income/(expense), net unless they are re-designated as hedges of other transactions.

Net Investment Hedges

The effective portions of net investment hedges are recorded in OCI as a part of the cumulative translation adjustment. The ineffective portions and amounts excluded from the effectiveness testing of net investment hedges are recognized in other income/(expense), net. For forward exchange contracts designated as net investment hedges, the Company excludes changes in fair value relating to changes in the forward carry component from its definition of effectiveness. Accordingly, any gains or losses related to this forward carry component are recognized in earnings in the current period.

Fair Value Hedges

Gains and losses related to changes in fair value hedges are recognized in earnings along with a corresponding loss or gain related to the change in value of the underlying hedged item in the same line in the Condensed Consolidated Statements of Operations.

Non-Designated Derivatives

Derivatives that are not designated as hedging instruments are adjusted to fair value through earnings in the financial statement line item to which the derivative relates. As a result, during the three months ended December 29, 2018, the Company recognized a gain of $255 million in net sales, a gain of $175 million in cost of sales and a gain of $723 million in other income/(expense), net.

The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. The following tables show the Company’s derivative instruments at gross fair value as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018
	Fair Value of Derivatives Designated as Hedge Instruments		Fair Value of Derivatives Not Designated as Hedge Instruments		Total Fair Value
Derivative assets ⁽¹⁾:
Foreign exchange contracts	$	1,110	$	419	$	1,529
Interest rate contracts	$	22	$	—	$	22

Derivative liabilities ⁽²⁾:
Foreign exchange contracts	$	701	$	345	$	1,046
Interest rate contracts	$	821	$	—	$	821



	September 29, 2018
	Fair Value of Derivatives Designated as Hedge Instruments		Fair Value of Derivatives Not Designated as Hedge Instruments		Total Fair Value
Derivative assets⁽¹⁾:
Foreign exchange contracts	$	1,015	$	259	$	1,274

Derivative liabilities ⁽²⁾:
Foreign exchange contracts	$	543	$	137	$	680
Interest rate contracts	$	1,456	$	—	$	1,456


(1)	The fair value of derivative assets is measured using Level 2 fair value inputs and is recorded as other current assets and other non-current assets in the Condensed Consolidated Balance Sheets.


(2)	The fair value of derivative liabilities is measured using Level 2 fair value inputs and is recorded as other current liabilities and other non-current liabilities in the Condensed Consolidated Balance Sheets.

The Company classifies cash flows related to derivative financial instruments as operating activities in its Condensed Consolidated Statements of Cash Flows.

The following table shows the pre-tax gains and losses of the Company’s derivative and non-derivative instruments designated as cash flow, net investment and fair value hedges in OCI and the Condensed Consolidated Statements of Operations for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Gains/(Losses) recognized in OCI – effective portion:
Cash flow hedges:
Foreign exchange contracts	$	(478	)	$	153
Interest rate contracts	—			1
Total	$	(478	)	$	154

Net investment hedges:
Foreign currency debt	$	(16	)	$	2

Gains/(Losses) reclassified from AOCI into net income – effective portion:
Cash flow hedges:
Foreign exchange contracts	$	(118	)	$	(124	)
Interest rate contracts	(1		)	1
Total	$	(119	)	$	(123	)

Gains/(Losses) on derivative instruments:
Fair value hedges:
Foreign exchange contracts	$	402		$	—
Interest rate contracts	657			(274		)
Total	$	1,059		$	(274	)

Gains/(Losses) related to hedged items:
Fair value hedges:
Marketable securities	$	(402	)	$	—
Fixed-rate debt	(657		)	274
Total	$	(1,059	)	$	274

The following table shows the notional amounts of the Company’s outstanding derivative instruments and credit risk amounts associated with outstanding or unsettled derivative instruments as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018				September 29, 2018
	Notional Amount		Credit Risk Amount		Notional Amount		Credit Risk Amount
Instruments designated as accounting hedges:
Foreign exchange contracts	$	56,000	$	1,110	$	65,368	$	1,015
Interest rate contracts	$	33,250	$	22	$	33,250	$	—

Instruments not designated as accounting hedges:
Foreign exchange contracts	$	82,013	$	419	$	63,062	$	259

The notional amounts for outstanding derivative instruments provide one measure of the transaction volume outstanding and do not represent the amount of the Company’s exposure to credit or market loss. The credit risk amounts represent the Company’s gross exposure to potential accounting loss on derivative instruments that are outstanding or unsettled if all counterparties failed to perform according to the terms of the contract, based on then-current currency or interest rates at each respective date. The Company’s exposure to credit loss and market risk will vary over time as currency and interest rates change. Although the table above reflects the notional and credit risk amounts of the Company’s derivative instruments, it does not reflect the gains or losses associated with the exposures and transactions that the instruments are intended to hedge. The amounts ultimately realized upon settlement of these financial instruments, together with the gains and losses on the underlying exposures, will depend on actual market conditions during the remaining life of the instruments.

The Company generally enters into master netting arrangements, which are designed to reduce credit risk by permitting net settlement of transactions with the same counterparty. To further limit credit risk, the Company generally enters into collateral security arrangements that provide for collateral to be received or posted when the net fair value of certain financial instruments fluctuates from contractually established thresholds. The Company presents its derivative assets and derivative liabilities at their gross fair values in its Condensed Consolidated Balance Sheets. The net cash collateral posted by the Company related to derivative instruments under its collateral security arrangements was $56 million and $1.0 billion as of December 29, 2018 and September 29, 2018, respectively, which were recorded as other current assets in the Condensed Consolidated Balance Sheets.

Under master netting arrangements with the respective counterparties to the Company’s derivative contracts, the Company is allowed to net settle transactions with a single net amount payable by one party to the other. As of December 29, 2018 and September 29, 2018, the potential effects of these rights of set-off associated with the Company’s derivative contracts, including the effects of collateral, would be a reduction to both derivative assets and derivative liabilities of $1.9 billion and $2.1 billion, respectively, resulting in a net derivative liability of $260 million and a net derivative asset of $138 million, respectively.

Accounts Receivable

Trade Receivables

The Company has considerable trade receivables outstanding with its third-party cellular network carriers, wholesalers, retailers, resellers, small and mid-sized businesses and education, enterprise and government customers. The Company generally does not require collateral from its customers; however, the Company will require collateral or third-party credit support in certain instances to limit credit risk. In addition, when possible, the Company attempts to limit credit risk on trade receivables with credit insurance for certain customers or by requiring third-party financing, loans or leases to support credit exposure. These credit-financing arrangements are directly between the third-party financing company and the end customer. As such, the Company generally does not assume any recourse or credit risk sharing related to any of these arrangements.

As of December 29, 2018, the Company had no customers that individually represented 10% or more of total trade receivables. As of September 29, 2018, the Company had one customer that represented 10% or more of total trade receivables, which accounted for 10%. The Company’s cellular network carriers accounted for 45% and 59% of total trade receivables as of December 29, 2018 and September 29, 2018, respectively.

Vendor Non-Trade Receivables

The Company has non-trade receivables from certain of its manufacturing vendors resulting from the sale of components to these vendors who manufacture sub-assemblies or assemble final products for the Company. The Company purchases these components directly from suppliers. As of December 29, 2018, the Company had two vendors that individually represented 10% or more of total vendor non-trade receivables, which accounted for 56% and 15%. As of September 29, 2018, the Company had two vendors that individually represented 10% or more of total vendor non-trade receivables, which accounted for 62% and 12%.

Condensed Consolidated Financial Statement Details

3 Months Ended

Dec. 29, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Condensed Consolidated Financial Statement Details

The following tables show the Company’s condensed consolidated financial statement details as of December 29, 2018 and September 29, 2018 (in millions):

Property, Plant and Equipment, Net



	December 29, 2018			September 29, 2018
Land and buildings	$	16,352		$	16,216
Machinery, equipment and internal-use software	66,823			65,982
Leasehold improvements	8,351			8,205
Gross property, plant and equipment	91,526			90,403
Accumulated depreciation and amortization	(51,929		)	(49,099		)
Total property, plant and equipment, net	$	39,597		$	41,304

Other Non-Current Liabilities



	December 29, 2018		September 29, 2018
Long-term taxes payable	$	30,948	$	33,589
Other non-current liabilities	23,607		15,325
Total other non-current liabilities	$	54,555	$	48,914

Other Income/(Expense), Net

The following table shows the detail of other income/(expense), net for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Interest and dividend income	$	1,307		$	1,452
Interest expense	(890		)	(734		)
Other income, net	143			38
Total other income/(expense), net	$	560		$	756

Income Taxes	3 Months Ended
Income Taxes	Dec. 29, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes U.S. Tax Cuts and Jobs Act On December 22, 2017, the U.S. enacted the Tax Cuts and Jobs Act (the “Act”), which significantly changed U.S. tax law. The Act lowered the Company’s U.S. statutory federal income tax rate from 35% to 21% effective January 1, 2018, while also imposing a deemed repatriation tax on previously deferred foreign income. The Act also created a new minimum tax on certain future foreign earnings. The Company completed its accounting for the income tax effects of the Act during the first quarter of 2019, in accordance with the U.S. Securities and Exchange Commission Staff Accounting Bulletin No. 118. Uncertain Tax Positions As of December 29, 2018, the total amount of gross unrecognized tax benefits was $14.7 billion, of which $8.2 billion, if recognized, would impact the Company’s effective tax rate. The Company had accrued $1.2 billion of gross interest and penalties as of December 29, 2018. Both the unrecognized tax benefits and the associated interest and penalties that are not expected to result in payment or receipt of cash within one year are classified as other non-current liabilities in the Condensed Consolidated Balance Sheet. The Company is subject to taxation and files income tax returns in the U.S. federal jurisdiction and in many state and foreign jurisdictions. The U.S. Internal Revenue Service concluded its review of the years 2013 through 2015 in 2018, and all years prior to 2016 are closed. Tax years subsequent to 2006 in certain major U.S. states and subsequent to 2010 in certain major foreign jurisdictions remain open, and could be subject to examination by the taxing authorities. The Company believes that an adequate provision has been made for any adjustments that may result from tax examinations. However, the outcome of tax audits cannot be predicted with certainty. If any issues addressed in the Company’s tax audits are resolved in a manner inconsistent with its expectations, the Company could be required to adjust its provision for income taxes in the period such resolution occurs. Although timing of resolution and/or closure of audits is not certain, the Company believes it is reasonably possible that its gross unrecognized tax benefits could decrease (either by payment, release or a combination of both) in the next 12 months by as much as $300 million. European Commission State Aid Decision On August 30, 2016, the European Commission announced its decision that Ireland granted state aid to the Company by providing tax opinions in 1991 and 2007 concerning the tax allocation of profits of the Irish branches of two subsidiaries of the Company (the “State Aid Decision”). The State Aid Decision ordered Ireland to calculate and recover additional taxes from the Company for the period June 2003 through December 2014. The recovery amount was calculated to be €13.1 billion, plus interest of €1.2 billion. Irish legislative changes, effective as of January 2015, eliminated the application of the tax opinions from that date forward. The Company believes the State Aid Decision to be without merit and appealed to the General Court of the Court of Justice of the European Union. Ireland has also appealed the State Aid Decision. The Company believes that any incremental Irish corporate income taxes potentially due related to the State Aid Decision would be creditable against U.S. taxes, subject to any foreign tax credit limitations in the Act. As of December 29, 2018, the entire recovery amount plus interest was funded into escrow, where it will remain restricted from general use pending conclusion of all appeals. Refer to Note 3, “Financial Instruments” for more information.

Debt

3 Months Ended

Dec. 29, 2018

Debt Disclosure [Abstract]

Debt

Commercial Paper

The Company issues unsecured short-term promissory notes (“Commercial Paper”) pursuant to a commercial paper program. The Company uses net proceeds from the commercial paper program for general corporate purposes, including dividends and share repurchases. As of both December 29, 2018 and September 29, 2018, the Company had $12.0 billion of Commercial Paper outstanding with maturities generally less than nine months. The weighted-average interest rate of the Company’s Commercial Paper was 2.39% as of December 29, 2018 and 2.18% as of September 29, 2018. The following table provides a summary of cash flows associated with the issuance and maturities of Commercial Paper for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Maturities 90 days or less:
Proceeds from/(Repayments of) commercial paper, net	$	2,011		$	1,621

Maturities greater than 90 days:
Proceeds from commercial paper	2,166			3,441
Repayments of commercial paper	(4,171		)	(5,060		)
Proceeds from/(Repayments of) commercial paper, net	(2,005		)	(1,619		)

Total change in commercial paper, net	$	6		$	2

Term Debt

As of December 29, 2018, the Company had outstanding floating- and fixed-rate notes with varying maturities for an aggregate principal amount of $103.8 billion (collectively the “Notes”). The Notes are senior unsecured obligations, and interest is payable in arrears, quarterly for the U.S. dollar–denominated and Australian dollar–denominated floating-rate notes, semi-annually for the U.S. dollar–denominated, Australian dollar–denominated, British pound–denominated, Japanese yen–denominated and Canadian dollar–denominated fixed-rate notes and annually for the euro-denominated and Swiss franc–denominated fixed-rate notes.

The following table provides a summary of the Company’s term debt as of December 29, 2018 and September 29, 2018:



	Maturities (calendar year)			December 29, 2018								September 29, 2018
	Maturities (calendar year)			Amount (in millions)			Effective Interest Rate					Amount (in millions)			Effective Interest Rate
2013 debt issuance of $17.0 billion:
Fixed-rate 2.400% – 3.850% notes	2023	–	2043	$	8,500			2.44%	–	3.91	%	$	8,500			2.44%	–	3.91	%

2014 debt issuance of $12.0 billion:
Floating-rate notes			2019	1,000						2.89	%	1,000						2.64	%
Fixed-rate 2.100% – 4.450% notes	2019	–	2044	8,500				2.89%	–	4.48	%	8,500				2.64%	–	4.48	%

2015 debt issuances of $27.3 billion:
Floating-rate notes	2019	–	2020	1,497				1.87%	–	2.92	%	1,507				1.87%	–	2.64	%
Fixed-rate 0.350% – 4.375% notes	2019	–	2045	24,181				0.28%	–	4.51	%	24,410				0.28%	–	4.51	%

2016 debt issuances of $24.9 billion:
Floating-rate notes	2019	–	2021	1,350				2.72%	–	3.81	%	1,350				2.48%	–	3.44	%
Fixed-rate 1.100% – 4.650% notes	2019	–	2046	23,038				1.13%	–	4.78	%	23,059				1.13%	–	4.78	%

2017 debt issuances of $28.7 billion:
Floating-rate notes	2019	–	2022	3,250				2.68%	–	3.10	%	3,250				2.41%	–	2.84	%
Fixed-rate 0.875% – 4.300% notes	2019	–	2047	25,454				1.54%	–	4.30	%	25,617				1.54%	–	4.30	%

2018 debt issuance of $7.0 billion:
Fixed-rate 1.800% – 3.750% notes	2019	–	2047	7,000				1.83%	–	3.80	%	7,000				1.83%	–	3.80	%
Total term debt				103,770								104,193

Unamortized premium/(discount) and issuance costs, net				(210		)						(218		)
Hedge accounting fair value adjustments				(799		)						(1,456		)
Less: Current portion of term debt				(9,772		)						(8,784		)
Total non-current portion of term debt				$	92,989							$	93,735

To manage interest rate risk on certain of its U.S. dollar–denominated fixed- or floating-rate notes, the Company has entered into interest rate swaps to effectively convert the fixed interest rates to floating interest rates or the floating interest rates to fixed interest rates on a portion of these notes. Additionally, to manage foreign currency risk on certain of its foreign currency–denominated notes, the Company has entered into foreign currency swaps to effectively convert these notes to U.S. dollar–denominated notes.

A portion of the Company’s Japanese yen–denominated notes is designated as a hedge of the foreign currency exposure of the Company’s net investment in a foreign operation. As of December 29, 2018 and September 29, 2018, the carrying value of the debt designated as a net investment hedge was $1.0 billion and $811 million, respectively. For further discussion regarding the Company’s use of derivative instruments, refer to the Derivative Financial Instruments section of Note 3, “Financial Instruments.”

The effective interest rates for the Notes include the interest on the Notes, amortization of the discount or premium and, if applicable, adjustments related to hedging. The Company recognized $809 million and $695 million of interest expense on its term debt for the three months ended December 29, 2018 and December 30, 2017, respectively.

As of December 29, 2018 and September 29, 2018, the fair value of the Company’s Notes, based on Level 2 inputs, was $102.6 billion and $103.2 billion, respectively.

Shareholders' Equity	3 Months Ended
Shareholders' Equity	Dec. 29, 2018
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Share Repurchase Program On May 1, 2018, the Company announced the Board of Directors had authorized a program to repurchase up to $100 billion of the Company’s common stock, of which $37.3 billion had been utilized as of December 29, 2018. During the three months ended December 29, 2018, the Company repurchased 38.0 million shares of its common stock for $8.2 billion. The Company’s share repurchase program does not obligate it to acquire any specific number of shares. Under this program, shares may be repurchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

Comprehensive Income

3 Months Ended

Dec. 29, 2018

Equity [Abstract]

Comprehensive Income

The Company’s OCI consists of foreign currency translation adjustments from those subsidiaries not using the U.S. dollar as their functional currency, net deferred gains and losses on certain derivative instruments accounted for as cash flow hedges and unrealized gains and losses on marketable debt securities classified as available-for-sale.

The following table shows the pre-tax amounts reclassified from AOCI into the Condensed Consolidated Statements of Operations, and the associated financial statement line item, for the three months ended December 29, 2018 and December 30, 2017 (in millions):



		Three Months Ended
Comprehensive Income Components	Financial Statement Line Item	December 29, 2018			December 30, 2017
Unrealized (gains)/losses on derivative instruments:
Foreign exchange contracts	Total net sales	$	63		$	184
	Total cost of sales	(375		)	(27		)
	Other income/(expense), net	396			(33		)
Interest rate contracts	Other income/(expense), net	1			(1		)
		85			123
Unrealized (gains)/losses on marketable securities	Other income/(expense), net	47			(116		)
Total amounts reclassified from AOCI		$	132		$	7

The following table shows the changes in AOCI by component for the three months ended December 29, 2018 (in millions):



	Cumulative Foreign Currency Translation			Unrealized Gains/Losses on Derivative Instruments			Unrealized Gains/Losses on Marketable Securities			Total
Balances as of September 29, 2018	$	(1,055	)	$	810		$	(3,209	)	$	(3,454	)
Other comprehensive income/(loss) before reclassifications	(82		)	(472		)	140			(414		)
Amounts reclassified from AOCI	—			85			47			132
Tax effect	4			95			(40		)	59
Other comprehensive income/(loss)	(78		)	(292		)	147			(223		)
Cumulative effect of change in accounting principle ⁽¹⁾	—			—			89			89
Balances as of December 29, 2018	$	(1,133	)	$	518		$	(2,973	)	$	(3,588	)


(1)	Refer to Note 1, “Summary of Significant Accounting Policies” for more information on the Company’s adoption of ASU 2016-01 at the beginning of the first quarter of 2019.

Benefit Plans

3 Months Ended

Dec. 29, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Benefit Plans

Stock Plans

The Company had 237.9 million shares reserved for future issuance under its stock plans as of December 29, 2018. Restricted stock units (“RSUs”) granted under the Company’s stock plans generally vest over four years, based on continued employment, and are settled upon vesting in shares of the Company’s common stock on a one-for-one basis. Each share issued with respect to RSUs granted under the Company’s stock plans reduces the number of shares available for grant under the plans by two shares. RSUs canceled and shares withheld to satisfy tax withholding obligations increase the number of shares available for grant under the plans utilizing a factor of two times the number of RSUs canceled or shares withheld.

Rule 10b5-1 Trading Plans

During the three months ended December 29, 2018, Section 16 officers Angela Ahrendts, Timothy D. Cook, Chris Kondo, Luca Maestri and Jeffrey Williams had equity trading plans in place in accordance with Rule 10b5-1(c)(1) under the Exchange Act. An equity trading plan is a written document that pre-establishes the amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of the Company’s stock, including shares acquired pursuant to the Company’s employee and director equity plans.

Restricted Stock Units

A summary of the Company’s RSU activity and related information for the three months ended December 29, 2018 is as follows:



	Number of RSUs (in thousands)		Weighted-Average Grant Date Fair Value Per RSU		Aggregate Fair Value (in millions)
Balance as of September 29, 2018	92,155		$	134.60
RSUs granted	29,228		$	223.41
RSUs vested	(18,935	)	$	124.36
RSUs canceled	(1,147	)	$	154.53
Balance as of December 29, 2018	101,301		$	161.91	$	15,826

The fair value as of the respective vesting dates of RSUs was $4.1 billion and $3.1 billion for the three months ended December 29, 2018 and December 30, 2017, respectively.

Share-Based Compensation

The following table shows share-based compensation expense and the related income tax benefit included in the Condensed Consolidated Statements of Operations for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Share-based compensation expense	$	1,559		$	1,296
Income tax benefit related to share-based compensation expense	$	(750	)	$	(631	)

As of December 29, 2018, the total unrecognized compensation cost related to outstanding RSUs and stock options was $14.0 billion, which the Company expects to recognize over a weighted-average period of 2.9 years.

Commitments and Contingencies

3 Months Ended

Dec. 29, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Accrued Warranty and Indemnification

The following table shows changes in the Company’s accrued warranties and related costs for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Beginning accrued warranty and related costs	$	3,692		$	3,834
Cost of warranty claims	(996		)	(982		)
Accruals for product warranty	1,123			1,471
Ending accrued warranty and related costs	$	3,819		$	4,323

Agreements entered into by the Company may include indemnification provisions, which may subject the Company to costs and damages in the event of a claim against an indemnified third party. Except as disclosed under the heading “Contingencies” below, in the opinion of management, there was not at least a reasonable possibility the Company may have incurred a material loss, or a material loss in excess of a recorded accrual, with respect to indemnification of third parties.

The Company offers an iPhone Upgrade Program, which is available to customers who purchase a qualifying iPhone in the U.S., the U.K. and mainland China. The iPhone Upgrade Program provides customers the right to trade in that iPhone for a specified amount when purchasing a new iPhone, provided certain conditions are met. The Company accounts for the trade-in right as a guarantee liability and recognizes arrangement revenue net of the fair value of such right, with subsequent changes to the guarantee liability recognized within net sales.

The Company has entered into indemnification agreements with its directors and executive officers. Under these agreements, the Company has agreed to indemnify such individuals to the fullest extent permitted by law against liabilities that arise by reason of their status as directors or officers of the Company, and to advance expenses incurred by such individuals in connection with related legal proceedings. It is not possible to determine the maximum potential amount of payments the Company could be required to make under these agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each claim. While the Company maintains directors and officers liability insurance coverage, such insurance coverage may be insufficient to cover all losses or all types of claims that may arise.

Concentrations in the Available Sources of Supply of Materials and Product

Although most components essential to the Company’s business are generally available from multiple sources, certain components are currently obtained from single or limited sources. In addition, the Company competes for various components with other participants in the markets for mobile communication and media devices and personal computers. Therefore, many components used by the Company, including those that are available from multiple sources, are at times subject to industry-wide shortage and significant commodity pricing fluctuations that could materially adversely affect the Company’s financial condition and operating results.

The Company uses some custom components that are not commonly used by its competitors, and new products introduced by the Company often utilize custom components available from only one source. When a component or product uses new technologies, initial capacity constraints may exist until the suppliers’ yields have matured or manufacturing capacity has increased. If the Company’s supply of components for a new or existing product were delayed or constrained, or if an outsourcing partner delayed shipments of completed products to the Company, the Company’s financial condition and operating results could be materially adversely affected. The Company’s business and financial performance could also be materially adversely affected depending on the time required to obtain sufficient quantities from the original source, or to identify and obtain sufficient quantities from an alternative source. Continued availability of these components at acceptable prices, or at all, may be affected if suppliers decide to concentrate on the production of common components instead of components customized to meet the Company’s requirements.

The Company has entered into agreements for the supply of many components; however, there can be no guarantee that the Company will be able to extend or renew these agreements on similar terms, or at all. Therefore, the Company remains subject to significant risks of supply shortages and price increases that could materially adversely affect its financial condition and operating results.

Substantially all of the Company’s hardware products are manufactured by outsourcing partners that are located primarily in Asia, with some Mac computers manufactured in the U.S. and Ireland. A significant concentration of this manufacturing is currently performed by a small number of outsourcing partners, often in single locations. Certain of these outsourcing partners are single-sourced suppliers of components and manufacturers for many of the Company’s products. Although the Company works closely with its outsourcing partners on manufacturing schedules, the Company’s financial condition and operating results could be materially adversely affected if its outsourcing partners were unable to meet their production commitments. The Company’s manufacturing purchase obligations typically cover its requirements for periods up to 150 days.

Other Off–Balance Sheet Commitments

Operating Leases

The Company leases various equipment and facilities, including retail space, under noncancelable operating lease arrangements. The Company does not currently utilize any other off–balance sheet financing arrangements. As of December 29, 2018, the Company’s total future minimum lease payments under noncancelable operating leases were $9.9 billion. The Company’s retail store and other facility leases typically have original terms not exceeding 10 years and generally contain multi-year renewal options.

Unconditional Purchase Obligations

The Company has entered into certain off–balance sheet commitments that require the future purchase of goods or services (“unconditional purchase obligations”). The Company’s unconditional purchase obligations primarily consist of payments for supplier arrangements, internet and telecommunication services, intellectual property licenses and content creation. As of December 29, 2018, the Company’s total future payments under noncancelable unconditional purchase obligations having a remaining term in excess of one year were $7.4 billion.

Contingencies

The Company is subject to various legal proceedings and claims that have arisen in the ordinary course of business and that have not been fully adjudicated, as further discussed in Part II, Item 1 of this Form 10-Q under the heading “Legal Proceedings” and in Part II, Item 1A of this Form 10-Q under the heading “Risk Factors.” The outcome of litigation is inherently uncertain. If one or more legal matters were resolved against the Company in a reporting period for amounts in excess of management’s expectations, the Company’s financial condition and operating results for that reporting period could be materially adversely affected. In the opinion of management, there was not at least a reasonable possibility the Company may have incurred a material loss, or a material loss in excess of a recorded accrual, with respect to loss contingencies for asserted legal and other claims, except for the following matters:

VirnetX

VirnetX, Inc. filed two lawsuits in the U.S. District Court for the Eastern District of Texas (the “Eastern Texas District Court”) against the Company alleging that certain Company products infringe four patents (the “VirnetX Patents”) relating to network communications technology (“VirnetX I” and “VirnetX II”). On September 30, 2016, a jury returned a verdict in VirnetX I against the Company and awarded damages of $302 million, which later increased to $440 million in post-trial proceedings. The Company appealed the VirnetX I verdict to the U.S. Court of Appeals for the Federal Circuit (the “Federal Circuit”). On April 11, 2018, a jury returned a verdict in VirnetX II against the Company and awarded damages of $503 million. VirnetX II is currently on appeal. The Company has challenged the validity of the VirnetX Patents at the U.S. Patent and Trademark Office (the “PTO”). In response, the PTO has declared the VirnetX Patents invalid. VirnetX appealed the invalidity decision of the PTO to the Federal Circuit. The Federal Circuit consolidated the Company’s appeal of the Eastern Texas District Court VirnetX I verdict and VirnetX’s appeals from the PTO invalidity proceedings. On January 15, 2019, the Federal Circuit affirmed the VirnetX I verdict, which the Company intends to further appeal. The remaining appeals from the PTO proceedings invalidating the VirnetX Patents remain pending.

Qualcomm

On January 20, 2017, the Company filed a lawsuit against Qualcomm Incorporated and affiliated parties (“Qualcomm”) in the U.S. District Court for the Southern District of California seeking, among other things, to enjoin Qualcomm from requiring the Company to pay royalties at the rate demanded by Qualcomm. As the Company does not believe the demanded royalty it has historically paid contract manufacturers for each applicable device is fair, reasonable and non-discriminatory, and believes it to be invalid and/or overstated in other respects as well, no Qualcomm-related royalty payments have been remitted by the Company to its contract manufacturers since the beginning of the second quarter of 2017. The Company believes it will prevail on the merits of the case and has accrued its best estimate for the ultimate resolution of this matter.

Following the Company’s lawsuit, Qualcomm has filed patent infringement suits against the Company and its affiliates in the U.S. and various international jurisdictions, some of which seek to enjoin the sale of certain of the Company’s products in particular countries. In one matter pending in China, on November 30, 2018, a court issued an order enjoining the sale in China of certain iPhone models running iOS 10 or iOS 11. The Company has taken steps to comply with the order and has deployed a software update to address the functionality at issue. The Company has sought reconsideration and a declaration of compliance with the order and has appealed the decision. In another matter pending in Germany, on December 20, 2018, a court issued an order enjoining the sale in Germany by the Company and certain of its subsidiaries of iPhone 7, 7 Plus, 8, 8 Plus and X. The Company has taken steps to comply with the order and has appealed the decision.

iOS Performance Management Cases

Various civil litigation matters have been filed in state and federal courts in the U.S. and in various international jurisdictions alleging violation of consumer protection laws, fraud, computer intrusion and other causes of action related to the Company’s performance management feature used in its iPhone operating systems, introduced to certain iPhones in iOS updates 10.2.1 and 11.2. The claims seek monetary damages and other non-monetary relief. On April 5, 2018, several U.S. federal actions were consolidated through a Multidistrict Litigation process into a single action in the U.S. District Court for the Northern District of California. In addition to civil litigation, the Company is also responding to governmental investigations and requests for information relating to the performance management feature. The Company believes that its iPhones were not defective, that the performance management feature introduced with iOS updates 10.2.1 and 11.2 was intended to, and did, improve customers’ user experience, and that the Company did not make any misleading statements or fail to disclose any material information. The Company has accrued its best estimate for the ultimate resolution of these matters.

Segment Information and Geographic Data

3 Months Ended

Dec. 29, 2018

Segment Reporting [Abstract]

Segment Information and Geographic Data

The Company reports segment information based on the “management” approach. The management approach designates the internal reporting used by management for making decisions and assessing performance as the source of the Company’s reportable segments.

The Company manages its business primarily on a geographic basis. The Company’s reportable segments consist of the Americas, Europe, Greater China, Japan and Rest of Asia Pacific. Americas includes both North and South America. Europe includes European countries, as well as India, the Middle East and Africa. Greater China includes China, Hong Kong and Taiwan. Rest of Asia Pacific includes Australia and those Asian countries not included in the Company’s other reportable segments. Although the reportable segments provide similar hardware and software products and similar services, each one is managed separately to better align with the location of the Company’s customers and distribution partners and the unique market dynamics of each geographic region. The accounting policies of the various segments are the same as those described in Note 1, “Summary of Significant Accounting Policies” of the Notes to Consolidated Financial Statements in Part II, Item 8 of the 2018 Form 10-K.

The Company evaluates the performance of its reportable segments based on net sales and operating income. Net sales for geographic segments are generally based on the location of customers and sales through the Company’s retail stores located in those geographic locations. Operating income for each segment includes net sales to third parties, related cost of sales and operating expenses directly attributable to the segment. Advertising expenses are generally included in the geographic segment in which the expenditures are incurred. Operating income for each segment excludes other income and expense and certain expenses managed outside the reportable segments. Costs excluded from segment operating income include various corporate expenses such as research and development, corporate marketing expenses, certain share-based compensation expenses, income taxes, various nonrecurring charges and other separately managed general and administrative costs. The Company does not include intercompany transfers between segments for management reporting purposes.

The following table shows information by reportable segment for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018		December 30, 2017
Americas:
Net sales	$	36,940	$	35,193
Operating income	$	11,200	$	11,316

Europe:
Net sales	$	20,363	$	21,054
Operating income	$	6,658	$	6,893

Greater China:
Net sales	$	13,169	$	17,956
Operating income	$	5,314	$	6,908

Japan:
Net sales	$	6,910	$	7,237
Operating income	$	3,014	$	3,082

Rest of Asia Pacific:
Net sales	$	6,928	$	6,853
Operating income	$	2,560	$	2,575

A reconciliation of the Company’s segment operating income to the Condensed Consolidated Statements of Operations for the three months ended December 29, 2018 and December 30, 2017 is as follows (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Segment operating income	$	28,746		$	30,774
Research and development expense	(3,902		)	(3,407		)
Other corporate expenses, net	(1,498		)	(1,093		)
Total operating income	$	23,346		$	26,274

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 29, 2018
Accounting Policies [Abstract]
Basis of Presentation and Preparation	Basis of Presentation and Preparation The accompanying condensed consolidated financial statements include the accounts of the Company. Intercompany accounts and transactions have been eliminated. In the opinion of the Company’s management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. The preparation of these condensed consolidated financial statements and accompanying notes in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ materially from those estimates. Certain prior period amounts in the condensed consolidated financial statements and accompanying notes have been reclassified to conform to the current period’s presentation. These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s annual consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the fiscal year ended September 29, 2018 (the “2018 Form 10-K”).
Fiscal Period	The Company’s fiscal year is the 52- or 53-week period that ends on the last Saturday of September. A 14th week is included in the first fiscal quarter every five or six years to realign the Company’s fiscal quarters with calendar quarters. The Company’s fiscal years 2019 and 2018 span 52 weeks each. Unless otherwise stated, references to particular years, quarters, months and periods refer to the Company’s fiscal years ended in September and the associated quarters, months and periods of those fiscal years.
New Accounting Pronouncements	Revenue Recognition In the first quarter of 2019, the Company adopted the Financial Accounting Standards Board’s (the “FASB”) Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), and additional ASUs issued to clarify the guidance in ASU 2014-09 (collectively the “new revenue standard”), which amends the existing accounting standards for revenue recognition. The Company adopted the new revenue standard utilizing the full retrospective transition method. The Company did not restate total net sales in the prior periods presented, as adoption of the new revenue standard did not have a material impact on previously reported amounts. Additionally, beginning in the first quarter of 2019, the Company classified the amortization of the deferred value of Maps, Siri^® and free iCloud services, which are bundled in the sales price of iPhone, Mac, iPad and certain other products, in Services net sales. Historically, the Company classified the amortization of these amounts in Products net sales consistent with its management reporting framework. As a result, Products and Services net sales information for the first quarter of 2018 was reclassified to conform to the 2019 presentation. Financial Instruments In the first quarter of 2019, the Company adopted FASB ASU No. 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”), which updates certain aspects of the recognition, measurement, presentation and disclosure of financial instruments. The adoption of ASU 2016-01 did not have a material impact on the Company’s condensed consolidated financial statements. Income Taxes In the first quarter of 2019, the Company adopted FASB ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”), which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The Company adopted ASU 2016-16 utilizing the modified retrospective transition method. Upon adoption, the Company recorded $2.7 billion of net deferred tax assets, reduced other non-current assets by $128 million, and increased retained earnings by $2.6 billion on its Condensed Consolidated Balance Sheet. The Company will recognize incremental deferred income tax expense as these net deferred tax assets are utilized.
Revenue Recognition	Net sales consist of revenue from the sale of iPhone, Mac, iPad, services and other products. The Company recognizes revenue at the amount to which it expects to be entitled when control of the products or services is transferred to its customers. Control is generally transferred when the Company has a present right to payment and title and the significant risks and rewards of ownership of products or services are transferred to its customers. For most of the Company’s products net sales, control transfers when products are shipped. For the Company’s services net sales, control transfers over time as services are delivered. Payment for products and services net sales is collected within a short period of time following transfer of control or commencement of delivery of services, as applicable. The Company records reductions to products net sales related to future product returns, price protection and other customer incentive programs based on the Company’s expectations and historical experience. For arrangements with multiple performance obligations, which represent promises within an arrangement that are capable of being distinct, the Company allocates revenue to all distinct performance obligations based on their relative stand-alone selling prices (“SSP”). When available, the Company uses observable prices to determine the SSP. When observable prices are not available, SSPs are established that reflect the Company’s best estimates of what the selling prices of the performance obligations would be if they were sold regularly on a stand-alone basis. The Company’s process for estimating SSPs without observable prices considers multiple factors that may vary depending upon the unique facts and circumstances related to each performance obligation including, where applicable, prices charged by the Company for similar offerings, market trends in the pricing for similar offerings, product-specific business objectives and the estimated cost to provide the performance obligation. The Company has identified up to three performance obligations regularly included in arrangements involving the sale of iPhone, Mac, iPad and certain other products. The first performance obligation, which represents the substantial portion of the allocated sales price, is the hardware and bundled software delivered at the time of sale. The second performance obligation is the right to receive certain product-related bundled services, which include iCloud, Siri and Maps. The third performance obligation is the right to receive, on a when-and-if-available basis, future unspecified software upgrades relating to the software bundled with each device. The Company allocates revenue and any related discounts to these performance obligations based on their relative SSPs. Because the Company lacks observable prices for the undelivered performance obligations, the allocation of revenue is based on the Company’s estimated SSPs. Revenue allocated to the delivered hardware and bundled software is recognized when control has transferred to the customer, which generally occurs when the product is shipped. Revenue allocated to the product-related bundled services and unspecified software upgrade rights is deferred and recognized on a straight-line basis over the estimated period they are expected to be provided. Cost of sales related to delivered hardware and bundled software, including estimated warranty costs, are recognized at the time of sale. Costs incurred to provide product-related bundled services and unspecified software upgrade rights are recognized as cost of sales as incurred. For certain long-term service arrangements, the Company has performance obligations for services it has not yet delivered. For these arrangements, the Company does not have a right to bill for the undelivered services. The Company has determined that any unbilled consideration relates entirely to the value of the undelivered services. Accordingly, the Company has not recognized revenue, and has elected not to disclose amounts, related to these undelivered services. For the sale of third-party products where the Company obtains control of the product before transferring it to the customer, the Company recognizes revenue based on the gross amount billed to customers. The Company considers multiple factors when determining whether it obtains control of third-party products including, but not limited to, evaluating if it has the ability to establish the price of the product, retains inventory risk for tangible products or has the responsibility for ensuring acceptability of the product. For third-party applications sold through the App Store, Mac App Store and TV App Store and certain digital content sold through the iTunes Store, the Company does not obtain control of the product before transferring it to the customer. Therefore, the Company accounts for such sales on a net basis by recognizing in services net sales only the commission it retains. The Company has elected to record revenue net of taxes collected from customers that are remitted to governmental authorities, with the collected taxes recorded within other current liabilities until remitted to the relevant government authority.
Marketable Securities	The Company’s investments in marketable debt securities have been classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in other comprehensive income/(loss) (“OCI”). The Company’s investments in mutual funds represent its only marketable equity securities and are classified as short-term based on the nature of the securities and their availability for use in current operations. The Company’s marketable equity securities are measured at fair value with gains and losses recognized in other income/(expense), net.
Fair Value Measurements	Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities.
Non-Marketable Securities	The Company holds non-marketable equity securities of certain privately held companies without readily determinable fair values, and has elected to apply the measurement alternative. As such, the Company’s non-marketable equity securities are measured at cost, less any impairment, and are adjusted for changes in fair value resulting from observable transactions for identical or similar investments of the same issuer. Gains and losses on non-marketable equity securities are recognized in other income/(expense), net.
Derivative Financial Instruments	The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. The Company classifies cash flows related to derivative financial instruments as operating activities in its Condensed Consolidated Statements of Cash Flows. Derivative Financial Instruments The Company may use derivatives to partially offset its business exposure to foreign currency and interest rate risk on expected future cash flows, net investments in certain foreign subsidiaries, and certain existing assets and liabilities. However, the Company may choose not to hedge certain exposures for a variety of reasons including, but not limited to, accounting considerations or the prohibitive economic cost of hedging particular exposures. There can be no assurance the hedges will offset more than a portion of the financial impact resulting from movements in foreign currency exchange or interest rates. To protect gross margins from fluctuations in foreign currency exchange rates, certain of the Company’s subsidiaries whose functional currency is the U.S. dollar may hedge a portion of forecasted foreign currency revenue, and subsidiaries whose functional currency is not the U.S. dollar may hedge a portion of forecasted inventory purchases not denominated in the subsidiaries’ functional currencies. The Company may enter into forward contracts, option contracts or other instruments to manage this risk and may designate these instruments as cash flow hedges. The Company generally hedges portions of its forecasted foreign currency exposure associated with revenue and inventory purchases, typically for up to 12 months. To protect the net investment in a foreign operation from fluctuations in foreign currency exchange rates, the Company may enter into foreign currency forward and option contracts to offset a portion of the changes in the carrying amounts of these investments due to fluctuations in foreign currency exchange rates. In addition, the Company may use non-derivative financial instruments, such as its foreign currency–denominated debt, as hedges of its net investments in certain foreign subsidiaries. In both of these cases, the Company designates these instruments as net investment hedges. To protect the Company’s foreign currency–denominated term debt or marketable securities from fluctuations in foreign currency exchange rates, the Company may enter into forward contracts, cross-currency swaps or other instruments. These instruments may offset a portion of the foreign currency remeasurement gains or losses, or changes in fair value. The Company may designate these instruments as either cash flow or fair value hedges. As of December 29, 2018, the Company’s hedged term debt– and marketable securities–related foreign currency transactions are expected to be recognized within 24 years. The Company may also enter into non-designated foreign currency contracts to offset a portion of the foreign currency exchange gains and losses generated by the remeasurement of certain assets and liabilities denominated in non-functional currencies. To protect the Company’s foreign currency–denominated term debt or marketable securities from fluctuations in interest rates, the Company may enter into interest rate swaps, options or other instruments. These instruments may offset a portion of the changes in interest income or expense, or changes in fair value. The Company designates these instruments as either cash flow or fair value hedges. As of December 29, 2018, the Company’s hedged interest rate transactions are expected to be recognized within 9 years. Cash Flow Hedges The effective portions of cash flow hedges are recorded in accumulated other comprehensive income/(loss) (“AOCI”) until the hedged item is recognized in earnings. Deferred gains and losses associated with cash flow hedges of foreign currency revenue are recognized as a component of net sales in the same period as the related revenue is recognized, and deferred gains and losses related to cash flow hedges of inventory purchases are recognized as a component of cost of sales in the same period as the related costs are recognized. Deferred gains and losses associated with cash flow hedges of interest income or expense are recognized in other income/(expense), net in the same period as the related income or expense is recognized. For options designated as cash flow hedges, changes in the time value are excluded from the assessment of hedge effectiveness. The ineffective portions and amounts excluded from the effectiveness testing of cash flow hedges are recognized in other income/(expense), net. Derivative instruments designated as cash flow hedges must be de-designated as hedges when it is probable the forecasted hedged transaction will not occur in the initially identified time period or within a subsequent two-month time period. Deferred gains and losses in AOCI associated with such derivative instruments are reclassified into other income/(expense), net in the period of de-designation. Any subsequent changes in fair value of such derivative instruments are reflected in other income/(expense), net unless they are re-designated as hedges of other transactions. Net Investment Hedges The effective portions of net investment hedges are recorded in OCI as a part of the cumulative translation adjustment. The ineffective portions and amounts excluded from the effectiveness testing of net investment hedges are recognized in other income/(expense), net. For forward exchange contracts designated as net investment hedges, the Company excludes changes in fair value relating to changes in the forward carry component from its definition of effectiveness. Accordingly, any gains or losses related to this forward carry component are recognized in earnings in the current period. Fair Value Hedges Gains and losses related to changes in fair value hedges are recognized in earnings along with a corresponding loss or gain related to the change in value of the underlying hedged item in the same line in the Condensed Consolidated Statements of Operations. Non-Designated Derivatives Derivatives that are not designated as hedging instruments are adjusted to fair value through earnings in the financial statement line item to which the derivative relates.
Segment Reporting	The Company reports segment information based on the “management” approach. The management approach designates the internal reporting used by management for making decisions and assessing performance as the source of the Company’s reportable segments. The Company manages its business primarily on a geographic basis. The Company’s reportable segments consist of the Americas, Europe, Greater China, Japan and Rest of Asia Pacific. Americas includes both North and South America. Europe includes European countries, as well as India, the Middle East and Africa. Greater China includes China, Hong Kong and Taiwan. Rest of Asia Pacific includes Australia and those Asian countries not included in the Company’s other reportable segments. Although the reportable segments provide similar hardware and software products and similar services, each one is managed separately to better align with the location of the Company’s customers and distribution partners and the unique market dynamics of each geographic region. The accounting policies of the various segments are the same as those described in Note 1, “Summary of Significant Accounting Policies” of the Notes to Consolidated Financial Statements in Part II, Item 8 of the 2018 Form 10-K. The Company evaluates the performance of its reportable segments based on net sales and operating income. Net sales for geographic segments are generally based on the location of customers and sales through the Company’s retail stores located in those geographic locations. Operating income for each segment includes net sales to third parties, related cost of sales and operating expenses directly attributable to the segment. Advertising expenses are generally included in the geographic segment in which the expenditures are incurred. Operating income for each segment excludes other income and expense and certain expenses managed outside the reportable segments. Costs excluded from segment operating income include various corporate expenses such as research and development, corporate marketing expenses, certain share-based compensation expenses, income taxes, various nonrecurring charges and other separately managed general and administrative costs. The Company does not include intercompany transfers between segments for management reporting purposes.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Dec. 29, 2018

Accounting Policies [Abstract]

Computation of Basic and Diluted Earnings Per Share

The following table shows the computation of basic and diluted earnings per share for the three months ended December 29, 2018 and December 30, 2017 (net income in millions and shares in thousands):



	Three Months Ended
	December 29, 2018		December 30, 2017
Numerator:
Net income	$	19,965	$	20,065

Denominator:
Weighted-average basic shares outstanding	4,735,820		5,112,877
Effect of dilutive securities	37,432		44,910
Weighted-average diluted shares	4,773,252		5,157,787

Basic earnings per share	$	4.22	$	3.92
Diluted earnings per share	$	4.18	$	3.89

Revenue Recognition (Tables)

3 Months Ended

Dec. 29, 2018

Revenue from Contract with Customer [Abstract]

Disaggregated Revenue

Net sales disaggregated by significant products and services for the three months ended December 29, 2018 and December 30, 2017 were as follows (in millions):



	Three Months Ended
	December 29, 2018		December 30, 2017
iPhone⁽¹⁾	$	51,982	$	61,104
Mac ⁽¹⁾	7,416		6,824
iPad⁽¹⁾	6,729		5,755
Wearables, Home and Accessories ⁽¹⁾⁽²⁾	7,308		5,481
Services ⁽³⁾	10,875		9,129
Total net sales ⁽⁴⁾	$	84,310	$	88,293


(1)	Products net sales include amortization of the deferred value of unspecified software upgrade rights, which are bundled in the sales price of the respective product.


(2)	Wearables, Home and Accessories net sales include sales of AirPods, Apple TV, Apple Watch, Beats® products, HomePod, iPod touch® and Apple-branded and third-party accessories.


(3)	Services net sales include sales from Digital Content and Services, AppleCare®, Apple Pay, licensing and other services. Services net sales also include amortization of the deferred value of Maps, Siri and free iCloud services, which are bundled in the sales price of certain products.


(4)	Includes $2.4 billion and $2.0 billion of revenue recognized in the three months ended December 29, 2018 and December 30, 2017, respectively, that was included in deferred revenue at the beginning of each respective period.

Financial Instruments (Tables)

3 Months Ended

Dec. 29, 2018

Investments, All Other Investments [Abstract]

Cash and Available-for-Sale Securities by Significant Investment Category

The following tables show the Company’s cash and marketable securities by significant investment category as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities
Cash	$	9,489	$	—	$	—		$	9,489	$	9,489	$	—	$	—

Level 1 ⁽¹⁾:
Money market funds	6,424		—		—			6,424		6,424		—		—
Mutual funds	682		—		—			682		—		682		—
Subtotal	7,106		—		—			7,106		6,424		682		—

Level 2 ⁽²⁾:
U.S. Treasury securities	46,191		6		(729		)	45,468		3,923		6,415		35,130
U.S. agency securities	9,731		—		(31		)	9,700		7,552		597		1,551
Non-U.S. government securities	23,460		48		(289		)	23,219		1,895		4,129		17,195
Certificates of deposit and time deposits	5,349		—		—			5,349		3,705		1,348		296
Commercial paper	11,953		—		—			11,953		11,679		274		—
Corporate debt securities	117,260		32		(2,387		)	114,905		104		27,134		87,667
Municipal securities	953		1		(7		)	947		—		187		760
Mortgage- and asset-backed securities	17,320		7		(428		)	16,899		—		890		16,009
Subtotal	232,217		94		(3,871		)	228,440		28,858		40,974		158,608

Total ⁽³⁾	$	248,812	$	94	$	(3,871	)	$	245,035	$	44,771	$	41,656	$	158,608



	September 29, 2018
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities
Cash	$	11,575	$	—	$	—		$	11,575	$	11,575	$	—	$	—

Level 1 ⁽¹⁾:
Money market funds	8,083		—		—			8,083		8,083		—		—
Mutual funds	799		—		(116		)	683		—		683		—
Subtotal	8,882		—		(116		)	8,766		8,083		683		—

Level 2 ⁽²⁾:
U.S. Treasury securities	47,296		—		(1,202		)	46,094		1,613		7,606		36,875
U.S. agency securities	4,127		—		(48		)	4,079		1,732		360		1,987
Non-U.S. government securities	21,601		49		(250		)	21,400		—		3,355		18,045
Certificates of deposit and time deposits	3,074		—		—			3,074		1,247		1,330		497
Commercial paper	2,573		—		—			2,573		1,663		910		—
Corporate debt securities	123,001		152		(2,038		)	121,115		—		25,162		95,953
Municipal securities	946		—		(12		)	934		—		178		756
Mortgage- and asset-backed securities	18,105		8		(623		)	17,490		—		804		16,686
Subtotal	220,723		209		(4,173		)	216,759		6,255		39,705		170,799

Total ⁽³⁾	$	241,180	$	209	$	(4,289	)	$	237,100	$	25,913	$	40,388	$	170,799


(1)	Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities.


(2)	Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.


(3)	As of December 29, 2018 and September 29, 2018, total cash, cash equivalents and marketable securities included $19.9 billion and $20.3 billion, respectively, that was restricted from general use, related to the State Aid Decision (refer to Note 5, “Income Taxes”) and other agreements.

Marketable Securities in a Continuous Unrealized Loss Position

The following tables show information about the Company’s marketable securities that had been in a continuous unrealized loss position for less than 12 months and for 12 months or greater as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018
	Continuous Unrealized Losses
	Less than 12 Months			12 Months or Greater			Total
Fair value of marketable debt securities	$	53,336		$	127,006		$	180,342
Unrealized losses	$	(1,153	)	$	(2,718	)	$	(3,871	)



	September 29, 2018
	Continuous Unrealized Losses
	Less than 12 Months			12 Months or Greater			Total
Fair value of marketable securities	$	126,238		$	60,599		$	186,837
Unrealized losses	$	(2,400	)	$	(1,889	)	$	(4,289	)

Derivative Instruments at Gross Fair Value

The following tables show the Company’s derivative instruments at gross fair value as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018
	Fair Value of Derivatives Designated as Hedge Instruments		Fair Value of Derivatives Not Designated as Hedge Instruments		Total Fair Value
Derivative assets ⁽¹⁾:
Foreign exchange contracts	$	1,110	$	419	$	1,529
Interest rate contracts	$	22	$	—	$	22

Derivative liabilities ⁽²⁾:
Foreign exchange contracts	$	701	$	345	$	1,046
Interest rate contracts	$	821	$	—	$	821



	September 29, 2018
	Fair Value of Derivatives Designated as Hedge Instruments		Fair Value of Derivatives Not Designated as Hedge Instruments		Total Fair Value
Derivative assets⁽¹⁾:
Foreign exchange contracts	$	1,015	$	259	$	1,274

Derivative liabilities ⁽²⁾:
Foreign exchange contracts	$	543	$	137	$	680
Interest rate contracts	$	1,456	$	—	$	1,456


(1)	The fair value of derivative assets is measured using Level 2 fair value inputs and is recorded as other current assets and other non-current assets in the Condensed Consolidated Balance Sheets.


(2)	The fair value of derivative liabilities is measured using Level 2 fair value inputs and is recorded as other current liabilities and other non-current liabilities in the Condensed Consolidated Balance Sheets.

Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Cash Flow, Net Investment and Fair Value Hedges

The following table shows the pre-tax gains and losses of the Company’s derivative and non-derivative instruments designated as cash flow, net investment and fair value hedges in OCI and the Condensed Consolidated Statements of Operations for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Gains/(Losses) recognized in OCI – effective portion:
Cash flow hedges:
Foreign exchange contracts	$	(478	)	$	153
Interest rate contracts	—			1
Total	$	(478	)	$	154

Net investment hedges:
Foreign currency debt	$	(16	)	$	2

Gains/(Losses) reclassified from AOCI into net income – effective portion:
Cash flow hedges:
Foreign exchange contracts	$	(118	)	$	(124	)
Interest rate contracts	(1		)	1
Total	$	(119	)	$	(123	)

Gains/(Losses) on derivative instruments:
Fair value hedges:
Foreign exchange contracts	$	402		$	—
Interest rate contracts	657			(274		)
Total	$	1,059		$	(274	)

Gains/(Losses) related to hedged items:
Fair value hedges:
Marketable securities	$	(402	)	$	—
Fixed-rate debt	(657		)	274
Total	$	(1,059	)	$	274

Notional Amounts of Outstanding Derivative Instruments and Credit Risk Amounts Associated with Outstanding or Unsettled Derivative Instruments

The following table shows the notional amounts of the Company’s outstanding derivative instruments and credit risk amounts associated with outstanding or unsettled derivative instruments as of December 29, 2018 and September 29, 2018 (in millions):



	December 29, 2018				September 29, 2018
	Notional Amount		Credit Risk Amount		Notional Amount		Credit Risk Amount
Instruments designated as accounting hedges:
Foreign exchange contracts	$	56,000	$	1,110	$	65,368	$	1,015
Interest rate contracts	$	33,250	$	22	$	33,250	$	—

Instruments not designated as accounting hedges:
Foreign exchange contracts	$	82,013	$	419	$	63,062	$	259

Condensed Consolidated Financial Statement Details (Tables)

3 Months Ended

Dec. 29, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Property, Plant and Equipment, Net



	December 29, 2018			September 29, 2018
Land and buildings	$	16,352		$	16,216
Machinery, equipment and internal-use software	66,823			65,982
Leasehold improvements	8,351			8,205
Gross property, plant and equipment	91,526			90,403
Accumulated depreciation and amortization	(51,929		)	(49,099		)
Total property, plant and equipment, net	$	39,597		$	41,304

Other Non-Current Liabilities



	December 29, 2018		September 29, 2018
Long-term taxes payable	$	30,948	$	33,589
Other non-current liabilities	23,607		15,325
Total other non-current liabilities	$	54,555	$	48,914

Other Income/(Expense), Net

The following table shows the detail of other income/(expense), net for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Interest and dividend income	$	1,307		$	1,452
Interest expense	(890		)	(734		)
Other income, net	143			38
Total other income/(expense), net	$	560		$	756

Debt (Tables)

3 Months Ended

Dec. 29, 2018

Debt Disclosure [Abstract]

Summary of Cash Flows Associated with Issuance and Maturities of Commercial Paper

The following table provides a summary of cash flows associated with the issuance and maturities of Commercial Paper for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Maturities 90 days or less:
Proceeds from/(Repayments of) commercial paper, net	$	2,011		$	1,621

Maturities greater than 90 days:
Proceeds from commercial paper	2,166			3,441
Repayments of commercial paper	(4,171		)	(5,060		)
Proceeds from/(Repayments of) commercial paper, net	(2,005		)	(1,619		)

Total change in commercial paper, net	$	6		$	2

Summary of Term Debt

The following table provides a summary of the Company’s term debt as of December 29, 2018 and September 29, 2018:



	Maturities (calendar year)			December 29, 2018								September 29, 2018
	Maturities (calendar year)			Amount (in millions)			Effective Interest Rate					Amount (in millions)			Effective Interest Rate
2013 debt issuance of $17.0 billion:
Fixed-rate 2.400% – 3.850% notes	2023	–	2043	$	8,500			2.44%	–	3.91	%	$	8,500			2.44%	–	3.91	%

2014 debt issuance of $12.0 billion:
Floating-rate notes			2019	1,000						2.89	%	1,000						2.64	%
Fixed-rate 2.100% – 4.450% notes	2019	–	2044	8,500				2.89%	–	4.48	%	8,500				2.64%	–	4.48	%

2015 debt issuances of $27.3 billion:
Floating-rate notes	2019	–	2020	1,497				1.87%	–	2.92	%	1,507				1.87%	–	2.64	%
Fixed-rate 0.350% – 4.375% notes	2019	–	2045	24,181				0.28%	–	4.51	%	24,410				0.28%	–	4.51	%

2016 debt issuances of $24.9 billion:
Floating-rate notes	2019	–	2021	1,350				2.72%	–	3.81	%	1,350				2.48%	–	3.44	%
Fixed-rate 1.100% – 4.650% notes	2019	–	2046	23,038				1.13%	–	4.78	%	23,059				1.13%	–	4.78	%

2017 debt issuances of $28.7 billion:
Floating-rate notes	2019	–	2022	3,250				2.68%	–	3.10	%	3,250				2.41%	–	2.84	%
Fixed-rate 0.875% – 4.300% notes	2019	–	2047	25,454				1.54%	–	4.30	%	25,617				1.54%	–	4.30	%

2018 debt issuance of $7.0 billion:
Fixed-rate 1.800% – 3.750% notes	2019	–	2047	7,000				1.83%	–	3.80	%	7,000				1.83%	–	3.80	%
Total term debt				103,770								104,193

Unamortized premium/(discount) and issuance costs, net				(210		)						(218		)
Hedge accounting fair value adjustments				(799		)						(1,456		)
Less: Current portion of term debt				(9,772		)						(8,784		)
Total non-current portion of term debt				$	92,989							$	93,735

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Comprehensive Income (Tables)

3 Months Ended

Dec. 29, 2018

Equity [Abstract]

Pre-tax Amounts Reclassified from AOCI into the Condensed Consolidated Statements of Operations

The following table shows the pre-tax amounts reclassified from AOCI into the Condensed Consolidated Statements of Operations, and the associated financial statement line item, for the three months ended December 29, 2018 and December 30, 2017 (in millions):



		Three Months Ended
Comprehensive Income Components	Financial Statement Line Item	December 29, 2018			December 30, 2017
Unrealized (gains)/losses on derivative instruments:
Foreign exchange contracts	Total net sales	$	63		$	184
	Total cost of sales	(375		)	(27		)
	Other income/(expense), net	396			(33		)
Interest rate contracts	Other income/(expense), net	1			(1		)
		85			123
Unrealized (gains)/losses on marketable securities	Other income/(expense), net	47			(116		)
Total amounts reclassified from AOCI		$	132		$	7

Changes in AOCI by Component

The following table shows the changes in AOCI by component for the three months ended December 29, 2018 (in millions):



	Cumulative Foreign Currency Translation			Unrealized Gains/Losses on Derivative Instruments			Unrealized Gains/Losses on Marketable Securities			Total
Balances as of September 29, 2018	$	(1,055	)	$	810		$	(3,209	)	$	(3,454	)
Other comprehensive income/(loss) before reclassifications	(82		)	(472		)	140			(414		)
Amounts reclassified from AOCI	—			85			47			132
Tax effect	4			95			(40		)	59
Other comprehensive income/(loss)	(78		)	(292		)	147			(223		)
Cumulative effect of change in accounting principle ⁽¹⁾	—			—			89			89
Balances as of December 29, 2018	$	(1,133	)	$	518		$	(2,973	)	$	(3,588	)


(1)	Refer to Note 1, “Summary of Significant Accounting Policies” for more information on the Company’s adoption of ASU 2016-01 at the beginning of the first quarter of 2019.

Benefit Plans (Tables)

3 Months Ended

Dec. 29, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Restricted Stock Unit Activity

A summary of the Company’s RSU activity and related information for the three months ended December 29, 2018 is as follows:



	Number of RSUs (in thousands)		Weighted-Average Grant Date Fair Value Per RSU		Aggregate Fair Value (in millions)
Balance as of September 29, 2018	92,155		$	134.60
RSUs granted	29,228		$	223.41
RSUs vested	(18,935	)	$	124.36
RSUs canceled	(1,147	)	$	154.53
Balance as of December 29, 2018	101,301		$	161.91	$	15,826

Summary of Share-Based Compensation Expense and the Related Income Tax Benefit

The following table shows share-based compensation expense and the related income tax benefit included in the Condensed Consolidated Statements of Operations for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Share-based compensation expense	$	1,559		$	1,296
Income tax benefit related to share-based compensation expense	$	(750	)	$	(631	)

Commitments and Contingencies (Tables)

3 Months Ended

Dec. 29, 2018

Commitments and Contingencies Disclosure [Abstract]

Changes in Accrued Warranties and Related Costs

The following table shows changes in the Company’s accrued warranties and related costs for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Beginning accrued warranty and related costs	$	3,692		$	3,834
Cost of warranty claims	(996		)	(982		)
Accruals for product warranty	1,123			1,471
Ending accrued warranty and related costs	$	3,819		$	4,323

Segment Information and Geographic Data (Tables)

3 Months Ended

Dec. 29, 2018

Segment Reporting [Abstract]

Summary Information by Reportable Segment

The following table shows information by reportable segment for the three months ended December 29, 2018 and December 30, 2017 (in millions):



	Three Months Ended
	December 29, 2018		December 30, 2017
Americas:
Net sales	$	36,940	$	35,193
Operating income	$	11,200	$	11,316

Europe:
Net sales	$	20,363	$	21,054
Operating income	$	6,658	$	6,893

Greater China:
Net sales	$	13,169	$	17,956
Operating income	$	5,314	$	6,908

Japan:
Net sales	$	6,910	$	7,237
Operating income	$	3,014	$	3,082

Rest of Asia Pacific:
Net sales	$	6,928	$	6,853
Operating income	$	2,560	$	2,575

Reconciliation of Segment Operating Income to the Condensed Consolidated Statements of Operations

A reconciliation of the Company’s segment operating income to the Condensed Consolidated Statements of Operations for the three months ended December 29, 2018 and December 30, 2017 is as follows (in millions):



	Three Months Ended
	December 29, 2018			December 30, 2017
Segment operating income	$	28,746		$	30,774
Research and development expense	(3,902		)	(3,407		)
Other corporate expenses, net	(1,498		)	(1,093		)
Total operating income	$	23,346		$	26,274

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 29, 2018	Sep. 30, 2018	Sep. 29, 2018	Sep. 30, 2017
Significant Accounting Policies [Line Items]
Reduction to other non-current assets upon adoption of ASU 2016-16	$ (34,686)		$ (22,283)
Potentially dilutive securities excluded from the computation of diluted earnings per share because their effect would have been antidilutive (in shares)	28.8
Accounting Standards Update 2016-16
Significant Accounting Policies [Line Items]
Increase to net deferred tax assets upon adoption of ASU 2016-16		$ 2,700
Reduction to other non-current assets upon adoption of ASU 2016-16		128
Retained earnings
Significant Accounting Policies [Line Items]
Increase to retained earnings upon adoption of ASU 2016-16			$ 2,501	$ 0
Retained earnings \| Accounting Standards Update 2016-16
Significant Accounting Policies [Line Items]
Increase to retained earnings upon adoption of ASU 2016-16		$ 2,600

Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Numerator:
Net income	$ 19,965	$ 20,065
Denominator:
Weighted-average basic shares outstanding (in shares)	4,735,820	5,112,877
Effect of dilutive securities (in shares)	37,432	44,910
Weighted-average diluted shares (in shares)	4,773,252	5,157,787
Basic earnings per share (in dollars per share)	$ 4.22	$ 3.92
Diluted earnings per share (in dollars per share)	$ 4.18	$ 3.89

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Revenue Recognition - Additional Information (Details) $ in Billions	Dec. 29, 2018 USD ($) obligation	Sep. 29, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Performance obligations in arrangements (up to) \| obligation	3
Total deferred revenue \| $	$ 8.4	$ 8.8

Revenue Recognition - Deferred Revenue, Expected Timing of Realization, Percentage (Details)	Dec. 29, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	66.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-29
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	27.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-27
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	6.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-12-26
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	1.00%

Revenue Recognition - Deferred Revenue, Expected Timing of Realization, Period (Details)	Dec. 29, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-29
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-27
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, period	1 year

Revenue Recognition - Net Sales Disaggregated by Significant Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 84,310	$ 88,293
Revenue recognized that was included in deferred revenue at the beginning of the period	2,400	2,000
iPhone
Disaggregation of Revenue [Line Items]
Net sales	51,982	61,104
Mac
Disaggregation of Revenue [Line Items]
Net sales	7,416	6,824
iPad
Disaggregation of Revenue [Line Items]
Net sales	6,729	5,755
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	7,308	5,481
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 10,875	$ 9,129

Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018	Dec. 30, 2017	Sep. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	$ 248,812	$ 241,180
Unrealized Gains	94	209
Unrealized Losses	(3,871)	(4,289)
Fair Value	245,035	237,100
Cash and Cash Equivalents	44,771	25,913	$ 27,491	$ 20,289
Short-Term Marketable Securities	41,656	40,388
Long-Term Marketable Securities	158,608	170,799
Total cash, cash equivalents and marketable securities that were restricted from general use	19,900	20,300
Level 1
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	7,106	8,882
Unrealized Gains	0	0
Unrealized Losses	0	(116)
Fair Value	7,106	8,766
Cash and Cash Equivalents	6,424	8,083
Short-Term Marketable Securities	682	683
Long-Term Marketable Securities	0	0
Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	232,217	220,723
Unrealized Gains	94	209
Unrealized Losses	(3,871)	(4,173)
Fair Value	228,440	216,759
Cash and Cash Equivalents	28,858	6,255
Short-Term Marketable Securities	40,974	39,705
Long-Term Marketable Securities	158,608	170,799
Cash
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	9,489	11,575
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	9,489	11,575
Cash and Cash Equivalents	9,489	11,575
Short-Term Marketable Securities	0	0
Long-Term Marketable Securities	0	0
Money market funds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	6,424	8,083
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	6,424	8,083
Cash and Cash Equivalents	6,424	8,083
Short-Term Marketable Securities	0	0
Long-Term Marketable Securities	0	0
Mutual funds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	682	799
Unrealized Gains	0	0
Unrealized Losses	0	(116)
Fair Value	682	683
Cash and Cash Equivalents	0	0
Short-Term Marketable Securities	682	683
Long-Term Marketable Securities	0	0
U.S. Treasury securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	46,191	47,296
Unrealized Gains	6	0
Unrealized Losses	(729)	(1,202)
Fair Value	45,468	46,094
Cash and Cash Equivalents	3,923	1,613
Short-Term Marketable Securities	6,415	7,606
Long-Term Marketable Securities	35,130	36,875
U.S. agency securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	9,731	4,127
Unrealized Gains	0	0
Unrealized Losses	(31)	(48)
Fair Value	9,700	4,079
Cash and Cash Equivalents	7,552	1,732
Short-Term Marketable Securities	597	360
Long-Term Marketable Securities	1,551	1,987
Non-U.S. government securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	23,460	21,601
Unrealized Gains	48	49
Unrealized Losses	(289)	(250)
Fair Value	23,219	21,400
Cash and Cash Equivalents	1,895	0
Short-Term Marketable Securities	4,129	3,355
Long-Term Marketable Securities	17,195	18,045
Certificates of deposit and time deposits \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	5,349	3,074
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	5,349	3,074
Cash and Cash Equivalents	3,705	1,247
Short-Term Marketable Securities	1,348	1,330
Long-Term Marketable Securities	296	497
Commercial paper \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	11,953	2,573
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	11,953	2,573
Cash and Cash Equivalents	11,679	1,663
Short-Term Marketable Securities	274	910
Long-Term Marketable Securities	0	0
Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	117,260	123,001
Unrealized Gains	32	152
Unrealized Losses	(2,387)	(2,038)
Fair Value	114,905	121,115
Cash and Cash Equivalents	104	0
Short-Term Marketable Securities	27,134	25,162
Long-Term Marketable Securities	87,667	95,953
Municipal securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	953	946
Unrealized Gains	1	0
Unrealized Losses	(7)	(12)
Fair Value	947	934
Cash and Cash Equivalents	0	0
Short-Term Marketable Securities	187	178
Long-Term Marketable Securities	760	756
Mortgage- and asset-backed securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	17,320	18,105
Unrealized Gains	7	8
Unrealized Losses	(428)	(623)
Fair Value	16,899	17,490
Cash and Cash Equivalents	0	0
Short-Term Marketable Securities	890	804
Long-Term Marketable Securities	$ 16,009	$ 16,686

Financial Instruments - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 29, 2018 USD ($) Customer Vendor	Sep. 29, 2018 USD ($) Customer Vendor
Financial Instruments [Line Items]
Non-marketable equity securities, carrying value	$ 2,200
Non-marketable debt security, amortized cost basis and carrying value	$ 1,500
Hedged interest rate transactions, expected recognition period	9 years
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements	$ 1,900	$ 2,100
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements	1,900	2,100
Net derivative assets/(liabilities) after potential reductions under master netting arrangements	$ (260)	$ 138
Trade receivables \| Credit concentration risk
Financial Instruments [Line Items]
Number of customers that individually represented 10% or more of total trade receivables \| Customer	0	1
Trade receivables \| Credit concentration risk \| Customer one
Financial Instruments [Line Items]
Concentration risk, percentage		10.00%
Trade receivables \| Credit concentration risk \| Cellular network carriers
Financial Instruments [Line Items]
Concentration risk, percentage	45.00%	59.00%
Non-trade receivables \| Credit concentration risk
Financial Instruments [Line Items]
Number of vendors that individually represented 10% or more of total vendor non-trade receivables \| Vendor	2	2
Non-trade receivables \| Credit concentration risk \| Vendor one
Financial Instruments [Line Items]
Concentration risk, percentage	56.00%	62.00%
Non-trade receivables \| Credit concentration risk \| Vendor two
Financial Instruments [Line Items]
Concentration risk, percentage	15.00%	12.00%
Other current assets
Financial Instruments [Line Items]
Net cash collateral posted, derivative instruments	$ 56	$ 1,000
Derivatives not designated as accounting hedges \| Net sales
Financial Instruments [Line Items]
Non-designated derivatives, fair value adjustment gains/(losses)	255
Derivatives not designated as accounting hedges \| Total cost of sales
Financial Instruments [Line Items]
Non-designated derivatives, fair value adjustment gains/(losses)	175
Derivatives not designated as accounting hedges \| Other income/(expense), net
Financial Instruments [Line Items]
Non-designated derivatives, fair value adjustment gains/(losses)	$ 723
Hedges of foreign currency exposure associated with revenue and inventory purchases
Financial Instruments [Line Items]
Hedged foreign currency transactions, expected recognition period	12 months
Hedges of foreign currency exposure associated with term debt and marketable securities
Financial Instruments [Line Items]
Hedged foreign currency transactions, expected recognition period	24 years
Minimum
Financial Instruments [Line Items]
General maturities of long-term marketable securities	1 year
Maximum
Financial Instruments [Line Items]
General maturities of long-term marketable securities	5 years

Financial Instruments - Marketable Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018
Fair Value of Marketable Debt Securities
Continuous Unrealized Losses, Less than 12 Months	$ 53,336	$ 126,238
Continuous Unrealized Losses, 12 Months or Greater	127,006	60,599
Continuous Unrealized Losses, Total	180,342	186,837
Unrealized Losses
Continuous Unrealized Losses, Less than 12 Months	(1,153)	(2,400)
Continuous Unrealized Losses, 12 Months or Greater	(2,718)	(1,889)
Continuous Unrealized Losses, Total	$ (3,871)	$ (4,289)

Financial Instruments - Derivative Instruments at Gross Fair Value (Details) - Level 2 - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018
Other current assets and other non-current assets \| Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	$ 1,529	$ 1,274
Other current assets and other non-current assets \| Interest rate contracts
Derivative assets:
Fair value of derivative assets	22
Other current assets and other non-current assets \| Derivatives designated as accounting hedges \| Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	1,110	1,015
Other current assets and other non-current assets \| Derivatives designated as accounting hedges \| Interest rate contracts
Derivative assets:
Fair value of derivative assets	22
Other current assets and other non-current assets \| Derivatives not designated as accounting hedges \| Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	419	259
Other current assets and other non-current assets \| Derivatives not designated as accounting hedges \| Interest rate contracts
Derivative assets:
Fair value of derivative assets	0
Other current liabilities and other non-current liabilities \| Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	1,046	680
Other current liabilities and other non-current liabilities \| Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	821	1,456
Other current liabilities and other non-current liabilities \| Derivatives designated as accounting hedges \| Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	701	543
Other current liabilities and other non-current liabilities \| Derivatives designated as accounting hedges \| Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	821	1,456
Other current liabilities and other non-current liabilities \| Derivatives not designated as accounting hedges \| Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	345	137
Other current liabilities and other non-current liabilities \| Derivatives not designated as accounting hedges \| Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	$ 0	$ 0

Financial Instruments - Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – effective portion	$ (478)	$ 154
Gains/(Losses) reclassified from AOCI into net income – effective portion	(119)	(123)
Cash flow hedges \| Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – effective portion	(478)	153
Gains/(Losses) reclassified from AOCI into net income – effective portion	(118)	(124)
Cash flow hedges \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – effective portion	0	1
Gains/(Losses) reclassified from AOCI into net income – effective portion	(1)	1
Net investment hedges \| Foreign currency debt
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – effective portion	(16)	2
Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) on derivative instruments	1,059	(274)
Gains/(Losses) related to hedged items	(1,059)	274
Fair value hedges \| Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) on derivative instruments	402	0
Gains/(Losses) related to hedged items	(402)	0
Fair value hedges \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) on derivative instruments	657	(274)
Gains/(Losses) related to hedged items	$ (657)	$ 274

Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018
Derivatives designated as accounting hedges \| Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	$ 56,000	$ 65,368
Derivative, credit risk amount	1,110	1,015
Derivatives designated as accounting hedges \| Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	33,250	33,250
Derivative, credit risk amount	22	0
Derivatives not designated as accounting hedges \| Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	82,013	63,062
Derivative, credit risk amount	$ 419	$ 259

Condensed Consolidated Financial Statement Details - Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 91,526	$ 90,403
Accumulated depreciation and amortization	(51,929)	(49,099)
Total property, plant and equipment, net	39,597	41,304
Land and buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	16,352	16,216
Machinery, equipment and internal-use software
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	66,823	65,982
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 8,351	$ 8,205

Condensed Consolidated Financial Statement Details - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Long-term taxes payable	$ 30,948	$ 33,589
Other non-current liabilities	23,607	15,325
Total other non-current liabilities	$ 54,555	$ 48,914

Condensed Consolidated Financial Statement Details - Other Income/(Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest and dividend income	$ 1,307	$ 1,452
Interest expense	(890)	(734)
Other income, net	143	38
Total other income/(expense), net	$ 560	$ 756

Income Taxes - Additional Information (Details) $ in Millions, € in Billions	Jan. 01, 2018	Dec. 31, 2017	Aug. 30, 2016 EUR (€) Subsidiary	Dec. 29, 2018 USD ($)
Income Tax Contingency [Line Items]
U.S. statutory federal income tax rate	21.00%	35.00%
Gross unrecognized tax benefits				$ 14,700
Gross unrecognized tax benefits that would impact effective tax rate, if recognized				8,200
Unrecognized tax benefits, gross interest and penalties accrued				1,200
Reasonably possible decrease in gross unrecognized tax benefits over next 12 months				$ 300
Unfavorable investigation outcome, EU State Aid rules
Income Tax Contingency [Line Items]
Number of subsidiaries impacted by European Commission tax ruling \| Subsidiary			2
Maximum potential loss related to European Commission tax ruling \| €			€ 13.1
Unfavorable investigation outcome, EU State Aid rules - interest component
Income Tax Contingency [Line Items]
Maximum potential loss related to European Commission tax ruling \| €			€ 1.2

Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Sep. 29, 2018
Debt Instrument [Line Items]
Commercial paper	$ 11,969		$ 11,964
Commercial paper, general maturity period (less than)	9 months
Commercial paper, weighted-average interest rate	2.39%		2.18%
Floating- and fixed-rate notes, aggregate principal amount	$ 103,770		$ 104,193
Interest expense on term debt	809	$ 695
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	102,600		103,200
Net investment hedges
Debt Instrument [Line Items]
Carrying value of debt designated as a net investment hedge	$ 1,000		$ 811

Debt - Summary of Cash Flows Associated with Commercial Paper (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Maturities 90 days or less:
Proceeds from/(Repayments of) commercial paper, net	$ 2,011	$ 1,621
Maturities greater than 90 days:
Proceeds from commercial paper	2,166	3,441
Repayments of commercial paper	(4,171)	(5,060)
Proceeds from/(Repayments of) commercial paper, net	(2,005)	(1,619)
Total change in commercial paper, net	$ 6	$ 2

Debt - Summary of Term Debt (Details) - USD ($)	3 Months Ended
Debt - Summary of Term Debt (Details) - USD ($)	Dec. 29, 2018	Sep. 29, 2018
Debt Instrument [Line Items]
Total term debt	$ 103,770,000,000	$ 104,193,000,000
Unamortized premium/(discount) and issuance costs, net	(210,000,000)	(218,000,000)
Hedge accounting fair value adjustments	(799,000,000)	(1,456,000,000)
Less: Current portion of term debt	(9,772,000,000)	(8,784,000,000)
Total non-current portion of term debt	92,989,000,000	93,735,000,000
2013 debt issuance of $17.0 billion
Debt Instrument [Line Items]
Debt instrument, face amount	17,000,000,000
2013 debt issuance of $17.0 billion \| Fixed-rate 2.400% – 3.850% notes
Debt Instrument [Line Items]
Total term debt	$ 8,500,000,000	$ 8,500,000,000
Debt instrument, maturity year, start	2023
Debt instrument, maturity year, end	2043
2013 debt issuance of $17.0 billion \| Fixed-rate 2.400% – 3.850% notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.40%
Debt instrument, effective interest rate	2.44%	2.44%
2013 debt issuance of $17.0 billion \| Fixed-rate 2.400% – 3.850% notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.85%
Debt instrument, effective interest rate	3.91%	3.91%
2014 debt issuance of $12.0 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 12,000,000,000
2014 debt issuance of $12.0 billion \| Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 1,000,000,000	$ 1,000,000,000
Debt instrument, maturity year	2019
Debt instrument, effective interest rate	2.89%	2.64%
2014 debt issuance of $12.0 billion \| Fixed-rate 2.100% – 4.450% notes
Debt Instrument [Line Items]
Total term debt	$ 8,500,000,000	$ 8,500,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2044
2014 debt issuance of $12.0 billion \| Fixed-rate 2.100% – 4.450% notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.10%
Debt instrument, effective interest rate	2.89%	2.64%
2014 debt issuance of $12.0 billion \| Fixed-rate 2.100% – 4.450% notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.45%
Debt instrument, effective interest rate	4.48%	4.48%
2015 debt issuances of $27.3 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 27,300,000,000
2015 debt issuances of $27.3 billion \| Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 1,497,000,000	$ 1,507,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2020
2015 debt issuances of $27.3 billion \| Floating-rate notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	1.87%	1.87%
2015 debt issuances of $27.3 billion \| Floating-rate notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.92%	2.64%
2015 debt issuances of $27.3 billion \| Fixed-rate 0.350% – 4.375% notes
Debt Instrument [Line Items]
Total term debt	$ 24,181,000,000	$ 24,410,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2045
2015 debt issuances of $27.3 billion \| Fixed-rate 0.350% – 4.375% notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0.35%
Debt instrument, effective interest rate	0.28%	0.28%
2015 debt issuances of $27.3 billion \| Fixed-rate 0.350% – 4.375% notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.375%
Debt instrument, effective interest rate	4.51%	4.51%
2016 debt issuances of $24.9 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 24,900,000,000
2016 debt issuances of $24.9 billion \| Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 1,350,000,000	$ 1,350,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2021
2016 debt issuances of $24.9 billion \| Floating-rate notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.72%	2.48%
2016 debt issuances of $24.9 billion \| Floating-rate notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	3.81%	3.44%
2016 debt issuances of $24.9 billion \| Fixed-rate 1.100% – 4.650% notes
Debt Instrument [Line Items]
Total term debt	$ 23,038,000,000	$ 23,059,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2046
2016 debt issuances of $24.9 billion \| Fixed-rate 1.100% – 4.650% notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	1.10%
Debt instrument, effective interest rate	1.13%	1.13%
2016 debt issuances of $24.9 billion \| Fixed-rate 1.100% – 4.650% notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.65%
Debt instrument, effective interest rate	4.78%	4.78%
2017 debt issuances of $28.7 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 28,700,000,000
2017 debt issuances of $28.7 billion \| Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 3,250,000,000	$ 3,250,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2022
2017 debt issuances of $28.7 billion \| Floating-rate notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.68%	2.41%
2017 debt issuances of $28.7 billion \| Floating-rate notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	3.10%	2.84%
2017 debt issuances of $28.7 billion \| Fixed-rate 0.875% – 4.300% notes
Debt Instrument [Line Items]
Total term debt	$ 25,454,000,000	$ 25,617,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2047
2017 debt issuances of $28.7 billion \| Fixed-rate 0.875% – 4.300% notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0.875%
Debt instrument, effective interest rate	1.54%	1.54%
2017 debt issuances of $28.7 billion \| Fixed-rate 0.875% – 4.300% notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.30%
Debt instrument, effective interest rate	4.30%	4.30%
2018 debt issuance of $7.0 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 7,000,000,000
2018 debt issuance of $7.0 billion \| Fixed-rate 1.800% – 3.750% notes
Debt Instrument [Line Items]
Total term debt	$ 7,000,000,000	$ 7,000,000,000
Debt instrument, maturity year, start	2019
Debt instrument, maturity year, end	2047
2018 debt issuance of $7.0 billion \| Fixed-rate 1.800% – 3.750% notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	1.80%
Debt instrument, effective interest rate	1.83%	1.83%
2018 debt issuance of $7.0 billion \| Fixed-rate 1.800% – 3.750% notes \| Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.75%
Debt instrument, effective interest rate	3.80%	3.80%

Shareholders' Equity - Additional Information (Details) - USD ($) shares in Millions	3 Months Ended
	Dec. 29, 2018	May 01, 2018
Equity [Abstract]
Maximum amount authorized for repurchase of common stock		$ 100,000,000,000
Share repurchase program, amount utilized	$ 37,300,000,000
Number of shares repurchased (in shares)	38.0
Amount of share repurchases	$ 8,236,000,000

Comprehensive Income - Pre-tax Amounts Reclassified from AOCI into the Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total cost of sales	$ 52,279	$ 54,381
Other income/(expense), net	(560)	(756)
Total amounts reclassified from AOCI	(23,906)	(27,030)
Reclassifications out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified from AOCI	132	7
Reclassifications out of AOCI \| Unrealized (gains)/losses on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified from AOCI	85	123
Reclassifications out of AOCI \| Unrealized (gains)/losses on derivative instruments \| Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total net sales	63	184
Total cost of sales	(375)	(27)
Other income/(expense), net	396	(33)
Reclassifications out of AOCI \| Unrealized (gains)/losses on derivative instruments \| Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income/(expense), net	1	(1)
Reclassifications out of AOCI \| Unrealized (gains)/losses on marketable securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income/(expense), net	$ 47	$ (116)

Comprehensive Income - Change in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Sep. 30, 2018	Sep. 29, 2018	Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 107,147	$ 134,047
Total other comprehensive income/(loss)	(223)	(691)
Ending balances	117,892	140,199
Total AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(3,454)	(150)
Other comprehensive income/(loss) before reclassifications	(414)
Amounts reclassified from AOCI	132
Tax effect	59
Total other comprehensive income/(loss)	(223)	(691)
Cumulative effect of changes in accounting principles				$ 89	$ 0
Ending balances	(3,588)	$ (841)
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(1,055)
Other comprehensive income/(loss) before reclassifications	(82)
Amounts reclassified from AOCI	0
Tax effect	4
Total other comprehensive income/(loss)	(78)
Ending balances	(1,133)
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	810
Other comprehensive income/(loss) before reclassifications	(472)
Amounts reclassified from AOCI	85
Tax effect	95
Total other comprehensive income/(loss)	(292)
Ending balances	518
Unrealized Gains/Losses on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(3,209)
Other comprehensive income/(loss) before reclassifications	140
Amounts reclassified from AOCI	47
Tax effect	(40)
Total other comprehensive income/(loss)	147
Ending balances	$ (2,973)
Accounting Standards Update 2016-01 \| Total AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles			$ 89
Accounting Standards Update 2016-01 \| Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles			0
Accounting Standards Update 2016-01 \| Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles			0
Accounting Standards Update 2016-01 \| Unrealized Gains/Losses on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles			$ 89

Benefit Plans - Additional Information (Details) shares in Millions, $ in Billions	3 Months Ended
	Dec. 29, 2018 USD ($) shares	Dec. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance under stock plans (in shares) \| shares	237.9
Total unrecognized compensation cost related to RSUs and stock options	$ 14.0
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period	2 years 11 months
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted, vesting period	4 years
Number of shares of common stock issued per RSU upon vesting	1
Factor by which each RSU granted reduces, or each RSU canceled or share withheld for taxes increases, the number of shares available for grant	2
Fair value of RSUs as of the respective vesting dates	$ 4.1	$ 3.1

Benefit Plans - Restricted Stock Units Activity and Related Information (Details) - Restricted stock units $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Dec. 29, 2018 USD ($) $ / shares shares
Number of Restricted Stock Units
Beginning balance (in shares) \| shares	92,155
RSUs granted (in shares) \| shares	29,228
RSUs vested (in shares) \| shares	(18,935)
RSUs canceled (in shares) \| shares	(1,147)
Ending balance (in shares) \| shares	101,301
Weighted-Average Grant Date Fair Value Per RSU
Beginning balance (in dollars per share) \| $ / shares	$ 134.60
RSUs granted (in dollars per share) \| $ / shares	223.41
RSUs vested (in dollars per share) \| $ / shares	124.36
RSUs canceled (in dollars per share) \| $ / shares	154.53
Ending balance (in dollars per share) \| $ / shares	$ 161.91
Aggregate Fair Value
Aggregate fair value of restricted stock units \| $	$ 15,826

Benefit Plans - Summary of Share-Based Compensation Expense and the Related Income Tax Benefit (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation expense	$ 1,559	$ 1,296
Income tax benefit related to share-based compensation expense	$ (750)	$ (631)

Commitments and Contingencies - Changes in Accrued Warranties and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Changes in Accrued Warranties and Related Costs [Roll Forward]
Beginning accrued warranty and related costs	$ 3,692	$ 3,834
Cost of warranty claims	(996)	(982)
Accruals for product warranty	1,123	1,471
Ending accrued warranty and related costs	$ 3,819	$ 4,323

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended
	Apr. 11, 2018	Sep. 30, 2016	Dec. 29, 2018
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments, period (up to)			150 days
Total future minimum lease payments under noncancelable operating leases			$ 9,900
Typical term of leases (not exceeding)			10 years
Unconditional purchase obligations			$ 7,400
VirnetX I \| Pending litigation
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party		$ 302
Award from legal proceeding, due to other party, revised amount, determined in subsequent proceedings		$ 440
VirnetX II \| Pending litigation
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party	$ 503

Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 84,310	$ 88,293
Operating income	23,346	26,274
Americas
Segment Reporting Information [Line Items]
Net sales	36,940	35,193
Operating income	11,200	11,316
Europe
Segment Reporting Information [Line Items]
Net sales	20,363	21,054
Operating income	6,658	6,893
Greater China
Segment Reporting Information [Line Items]
Net sales	13,169	17,956
Operating income	5,314	6,908
Japan
Segment Reporting Information [Line Items]
Net sales	6,910	7,237
Operating income	3,014	3,082
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	6,928	6,853
Operating income	$ 2,560	$ 2,575

Segment Information and Geographic Data - Reconciliation of Segment Operating Income to Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 23,346	$ 26,274
Research and development expense	(3,902)	(3,407)
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	28,746	30,774
Segment reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	(3,902)	(3,407)
Corporate non-segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other corporate expenses, net	$ (1,498)	$ (1,093)