Apple (AAPL) 10-Q 29 Apr 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares shares in Thousands	6 Months Ended
	Mar. 27, 2021	Apr. 16, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 27, 2021
Document Transition Report	false
Entity File Number	001-36743
Entity Registrant Name	Apple Inc.
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	94-2404110
Entity Address, Address Line One	One Apple Park Way
Entity Address, City or Town	Cupertino
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95014
City Area Code	408
Local Phone Number	996-1010
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		16,687,631
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000320193
Current Fiscal Year End Date	--09-25
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.00001 par value per share
Trading Symbol	AAPL
Security Exchange Name	NASDAQ
1.000% Notes due 2022
Entity Information [Line Items]
Title of 12(b) Security	1.000% Notes due 2022
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
1.375% Notes due 2024
Entity Information [Line Items]
Title of 12(b) Security	1.375% Notes due 2024
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
0.000% Notes due 2025
Entity Information [Line Items]
Title of 12(b) Security	0.000% Notes due 2025
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
0.875% Notes due 2025
Entity Information [Line Items]
Title of 12(b) Security	0.875% Notes due 2025
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
1.625% Notes due 2026
Entity Information [Line Items]
Title of 12(b) Security	1.625% Notes due 2026
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
2.000% Notes due 2027
Entity Information [Line Items]
Title of 12(b) Security	2.000% Notes due 2027
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
1.375% Notes due 2029
Entity Information [Line Items]
Title of 12(b) Security	1.375% Notes due 2029
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
3.050% Notes due 2029
Entity Information [Line Items]
Title of 12(b) Security	3.050% Notes due 2029
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
0.500% Notes due 2031
Entity Information [Line Items]
Title of 12(b) Security	0.500% Notes due 2031
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
3.600% Notes due 2042
Entity Information [Line Items]
Title of 12(b) Security	3.600% Notes due 2042
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Net sales	$ 89,584	$ 58,313	$ 201,023	$ 150,132
Cost of sales	51,505	35,943	118,616	92,545
Gross margin	38,079	22,370	82,407	57,587
Operating expenses:
Research and development	5,262	4,565	10,425	9,016
Selling, general and administrative	5,314	4,952	10,945	10,149
Total operating expenses	10,576	9,517	21,370	19,165
Operating income	27,503	12,853	61,037	38,422
Other income/(expense), net	508	282	553	631
Income before provision for income taxes	28,011	13,135	61,590	39,053
Provision for income taxes	4,381	1,886	9,205	5,568
Net income	$ 23,630	$ 11,249	$ 52,385	$ 33,485
Earnings per share:
Basic (in dollars per share)	$ 1.41	$ 0.64	$ 3.11	$ 1.91
Diluted (in dollars per share)	$ 1.40	$ 0.64	$ 3.08	$ 1.89
Shares used in computing earnings per share:
Basic (in shares)	16,753,476	17,440,402	16,844,298	17,550,281
Diluted (in shares)	16,929,157	17,618,765	17,021,423	17,718,591
Products
Net sales	$ 72,683	$ 44,965	$ 168,361	$ 124,069
Cost of sales	46,447	31,321	108,577	83,396
Services
Net sales	16,901	13,348	32,662	26,063
Cost of sales	$ 5,058	$ 4,622	$ 10,039	$ 9,149

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 23,630	$ 11,249	$ 52,385	$ 33,485
Other comprehensive income/(loss):
Change in foreign currency translation, net of tax	(78)	(566)	471	(364)
Change in unrealized gains/losses on derivative instruments, net of tax:
Change in fair value of derivatives	332	(143)	28	(32)
Adjustment for net (gains)/losses realized and included in net income	759	634	576	236
Total change in unrealized gains/losses on derivative instruments	1,091	491	604	204
Change in unrealized gains/losses on marketable debt securities, net of tax:
Change in fair value of marketable debt securities	(1,403)	(2,325)	(775)	(2,200)
Adjustment for net (gains)/losses realized and included in net income	(75)	29	(180)	19
Total change in unrealized gains/losses on marketable debt securities	(1,478)	(2,296)	(955)	(2,181)
Total other comprehensive income/(loss)	(465)	(2,371)	120	(2,341)
Total comprehensive income	$ 23,165	$ 8,878	$ 52,505	$ 31,144

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020
Current assets:
Cash and cash equivalents	$ 38,466	$ 38,016
Marketable securities	31,368	52,927
Accounts receivable, net	18,503	16,120
Inventories	5,219	4,061
Vendor non-trade receivables	14,533	21,325
Other current assets	13,376	11,264
Total current assets	121,465	143,713
Non-current assets:
Marketable securities	134,539	100,887
Property, plant and equipment, net	37,815	36,766
Other non-current assets	43,339	42,522
Total non-current assets	215,693	180,175
Total assets	337,158	323,888
Current liabilities:
Accounts payable	40,127	42,296
Other current liabilities	45,660	42,684
Deferred revenue	7,595	6,643
Commercial paper	5,000	4,996
Term debt	8,003	8,773
Total current liabilities	106,385	105,392
Non-current liabilities:
Term debt	108,642	98,667
Other non-current liabilities	52,953	54,490
Total non-current liabilities	161,595	153,157
Total liabilities	267,980	258,549
Commitments and contingencies
Shareholders’ equity:
Common stock and additional paid-in capital, $0.00001 par value: 50,400,000 shares authorized; 16,686,305 and 16,976,763 shares issued and outstanding, respectively	54,203	50,779
Retained earnings	15,261	14,966
Accumulated other comprehensive income/(loss)	(286)	(406)
Total shareholders’ equity	69,178	65,339
Total liabilities and shareholders’ equity	$ 337,158	$ 323,888

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Mar. 27, 2021	Sep. 26, 2020
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	50,400,000,000	50,400,000,000
Common stock, shares issued (in shares)	16,686,305,000	16,976,763,000
Common stock, shares outstanding (in shares)	16,686,305,000	16,976,763,000

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common stock and additional paid-in capital	Retained earnings	Retained earningsCumulative effect of change in accounting principle	Accumulated other comprehensive income/(loss)	Accumulated other comprehensive income/(loss)Cumulative effect of change in accounting principle
Beginning balances at Sep. 28, 2019	$ 90,488	$ 45,174	$ 45,898	$ (136)	$ (584)	$ 136
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		430
Common stock withheld related to net share settlement of equity awards		(1,052)	(632)
Share-based compensation		3,480
Net income	33,485		33,485
Dividends and dividend equivalents declared			(6,917)
Common stock repurchased			(38,516)
Other comprehensive income/(loss)	(2,341)				(2,341)
Ending balances at Mar. 28, 2020	$ 78,425	48,032	33,182		(2,789)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.385
Beginning balances at Dec. 28, 2019	$ 89,531	45,972	43,977	0	(418)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		428
Common stock withheld related to net share settlement of equity awards		(101)	(96)
Share-based compensation		1,733
Net income	11,249		11,249
Dividends and dividend equivalents declared			(3,432)
Common stock repurchased			(18,516)
Other comprehensive income/(loss)	(2,371)				(2,371)
Ending balances at Mar. 28, 2020	$ 78,425	48,032	33,182		(2,789)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.1925
Beginning balances at Sep. 26, 2020	$ 65,339	50,779	14,966	0	(406)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		561
Common stock withheld related to net share settlement of equity awards		(1,236)	(2,047)
Share-based compensation		4,099
Net income	52,385		52,385
Dividends and dividend equivalents declared			(7,042)
Common stock repurchased	(43,000)		(43,001)
Other comprehensive income/(loss)	120				120
Ending balances at Mar. 27, 2021	$ 69,178	54,203	15,261		(286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.41
Beginning balances at Dec. 26, 2020	$ 66,224	51,744	14,301	$ 0	179	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		561
Common stock withheld related to net share settlement of equity awards		(135)	(174)
Share-based compensation		2,033
Net income	23,630		23,630
Dividends and dividend equivalents declared			(3,495)
Common stock repurchased			(19,001)
Other comprehensive income/(loss)	(465)				(465)
Ending balances at Mar. 27, 2021	$ 69,178	$ 54,203	$ 15,261		$ (286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.205

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Statement of Cash Flows [Abstract]
Cash, cash equivalents and restricted cash, beginning balances	$ 39,789	$ 50,224
Operating activities:
Net income	52,385	33,485
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	5,463	5,602
Share-based compensation expense	4,001	3,407
Deferred income tax benefit	(207)	(651)
Other	(474)	(259)
Changes in operating assets and liabilities:
Accounts receivable, net	(2,347)	7,284
Inventories	(1,226)	699
Vendor non-trade receivables	6,792	7,923
Other current and non-current assets	(4,333)	(8,866)
Accounts payable	(1,997)	(13,520)
Deferred revenue	1,642	1,223
Other current and non-current liabilities	3,045	7,500
Cash generated by operating activities	62,744	43,827
Investing activities:
Purchases of marketable securities	(74,424)	(66,489)
Proceeds from maturities of marketable securities	39,605	39,738
Proceeds from sales of marketable securities	21,645	27,762
Payments for acquisition of property, plant and equipment	(5,769)	(3,960)
Payments made in connection with business acquisitions, net	(9)	(1,134)
Other	0	(572)
Cash used in investing activities	(18,952)	(4,655)
Financing activities:
Proceeds from issuance of common stock	561	430
Payments for taxes related to net share settlement of equity awards	(3,160)	(1,566)
Payments for dividends and dividend equivalents	(7,060)	(6,914)
Repurchases of common stock	(43,323)	(39,280)
Proceeds from issuance of term debt, net	13,923	2,210
Repayments of term debt	(4,500)	(5,250)
Proceeds from commercial paper, net	22	1,518
Proceeds from repurchase agreement	0	2,556
Other	(38)	(51)
Cash used in financing activities	(43,575)	(46,347)
Increase/(Decrease) in cash, cash equivalents and restricted cash	217	(7,175)
Cash, cash equivalents and restricted cash, ending balances	40,006	43,049
Supplemental cash flow disclosure:
Cash paid for income taxes, net	10,276	7,505
Cash paid for interest	$ 1,327	$ 1,689

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Mar. 27, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Preparation The condensed consolidated financial statements include the accounts of Apple Inc. and its wholly owned subsidiaries (collectively “Apple” or 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 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 accompanying notes included in its Annual Report on Form 10-K for the fiscal year ended September 26, 2020 (the “2020 Form 10-K”). The Company’s fiscal year is the 52- or 53-week period that ends on the last Saturday of September. An additional 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 2021 and 2020 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. Common Stock Split On August 28, 2020, the Company effected a four-for-one stock split to shareholders of record as of August 24, 2020. All share, restricted stock unit (“RSU”) and per share or per RSU information has been retroactively adjusted to reflect the stock split. Recently Adopted Accounting Pronouncements Financial Instruments – Credit Losses At the beginning of the first quarter of 2021, the Company adopted the Financial Accounting Standards Board’s Accounting Standards Update No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which modifies the measurement of expected credit losses on certain financial instruments. The Company adopted ASU 2016-13 utilizing the modified retrospective transition method. The adoption of ASU 2016-13 did not have a material impact on the Company’s condensed consolidated financial statements. Earnings Per Share The following table shows the computation of basic and diluted earnings per share for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (net income in millions and shares in thousands): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Numerator: Net income $ 23,630 $ 11,249 $ 52,385 $ 33,485 Denominator: Weighted-average basic shares outstanding 16,753,476 17,440,402 16,844,298 17,550,281 Effect of dilutive securities 175,681 178,363 177,125 168,310 Weighted-average diluted shares 16,929,157 17,618,765 17,021,423 17,718,591 Basic earnings per share $ 1.41 $ 0.64 $ 3.11 $ 1.91 Diluted earnings per share $ 1.40 $ 0.64 $ 3.08 $ 1.89

Revenue Recognition

Revenue Recognition	6 Months Ended
	Mar. 27, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition	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 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 distinct, the Company allocates revenue to all distinct performance obligations based on their relative stand-alone selling prices (“SSPs”). When available, the Company uses observable prices to determine SSPs. 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 can 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 ® and certain digital content sold through the Company’s other digital content stores, 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 March 27, 2021 and September 26, 2020, the Company had total deferred revenue of $11.9 billion and $10.2 billion, respectively. As of March 27, 2021, the Company expects 64% of total deferred revenue to be realized in less than a year, 26% within one-to-two years, 8% within two-to-three years and 2% in greater than three years. Disaggregated Revenue Net sales disaggregated by significant products and services for the three- and six-month periods ended March 27, 2021 and March 28, 2020 were as follows (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, iPhone (1) $ 47,938 $ 28,962 $ 113,535 $ 84,919 Mac (1) 9,102 5,351 17,777 12,511 iPad (1) 7,807 4,368 16,242 10,345 Wearables, Home and Accessories (1)(2) 7,836 6,284 20,807 16,294 Services (3) 16,901 13,348 32,662 26,063 Total net sales (4) $ 89,584 $ 58,313 $ 201,023 $ 150,132 (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 the Company’s advertising, AppleCare ® , digital content and other services. Services net sales also include amortization of the deferred value of Maps, Siri, and free iCloud storage and Apple TV+ SM services, which are bundled in the sales price of certain products. (4) Includes $2.7 billion of revenue recognized in the three months ended March 27, 2021 that was included in deferred revenue as of December 26, 2020, $1.9 billion of revenue recognized in the three months ended March 28, 2020 that was included in deferred revenue as of December 28, 2019, $4.1 billion of revenue recognized in the six months ended March 27, 2021 that was included in deferred revenue as of September 26, 2020, and $3.0 billion of revenue recognized in the six months ended March 28, 2020 that was included in deferred revenue as of September 28, 2019. 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- and six-month periods ended March 27, 2021 and March 28, 2020.

Financial Instruments

Financial Instruments	6 Months Ended
	Mar. 27, 2021
Investments, All Other Investments [Abstract]
Financial Instruments	Financial Instruments Cash, Cash Equivalents and Marketable Securities The following tables show the Company’s cash and marketable securities by significant investment category as of March 27, 2021 and September 26, 2020 (in millions): March 27, 2021 Adjusted Unrealized Unrealized Fair Cash and Current Non-Current Marketable Cash $ 19,444 $ — $ — $ 19,444 $ 19,444 $ — $ — Level 1 (1) : Money market funds 11,998 — — 11,998 11,998 — — Mutual funds 143 1 (2) 142 — 142 — Subtotal 12,141 1 (2) 12,140 11,998 142 — Level 2 (2) : U.S. Treasury securities 21,331 168 (149) 21,350 205 8,058 13,087 U.S. agency securities 8,228 5 (72) 8,161 — 3,212 4,949 Non-U.S. government securities 19,849 211 (169) 19,891 200 2,881 16,810 Certificates of deposit and time deposits 7,198 — — 7,198 5,814 1,114 270 Commercial paper 3,353 — — 3,353 805 2,548 — Corporate debt securities 88,108 1,506 (444) 89,170 — 13,036 76,134 Municipal securities 980 16 (1) 995 — 136 859 Mortgage- and asset-backed securities 22,624 234 (187) 22,671 — 241 22,430 Subtotal 171,671 2,140 (1,022) 172,789 7,024 31,226 134,539 Total (3) $ 203,256 $ 2,141 $ (1,024) $ 204,373 $ 38,466 $ 31,368 $ 134,539 September 26, 2020 Adjusted Unrealized Unrealized Fair Cash and Current Non-Current Cash $ 17,773 $ — $ — $ 17,773 $ 17,773 $ — $ — Level 1 (1) : Money market funds 2,171 — — 2,171 2,171 — — Level 2 (2) : U.S. Treasury securities 28,439 331 — 28,770 8,580 11,972 8,218 U.S. agency securities 8,604 8 — 8,612 2,009 3,078 3,525 Non-U.S. government securities 19,361 275 (186) 19,450 255 3,329 15,866 Certificates of deposit and time deposits 10,399 — — 10,399 4,043 6,246 110 Commercial paper 11,226 — — 11,226 3,185 8,041 — Corporate debt securities 76,937 1,834 (175) 78,596 — 19,687 58,909 Municipal securities 1,001 22 — 1,023 — 139 884 Mortgage- and asset-backed securities 13,520 314 (24) 13,810 — 435 13,375 Subtotal 169,487 2,784 (385) 171,886 18,072 52,927 100,887 Total (3) $ 189,431 $ 2,784 $ (385) $ 191,830 $ 38,016 $ 52,927 $ 100,887 (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 March 27, 2021 and September 26, 2020, total marketable securities included $19.0 billion and $18.6 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 following table shows the fair value of the Company’s non-current marketable debt securities, by contractual maturity, as of March 27, 2021 (in millions): Due after 1 year through 5 years $ 83,364 Due after 5 years through 10 years 28,835 Due after 10 years 22,340 Total fair value $ 134,539 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. Non-Marketable Securities The Company holds non-marketable equity securities of certain privately held companies without readily determinable fair values. As of March 27, 2021 and September 26, 2020, the Company’s non-marketable equity securities had a carrying value of $2.7 billion and $2.8 billion, respectively. Restricted Cash A reconciliation of the Company’s cash and cash equivalents in the Condensed Consolidated Balance Sheets to cash, cash equivalents and restricted cash in the Condensed Consolidated Statements of Cash Flows as of March 27, 2021 and September 26, 2020 is as follows (in millions): March 27, September 26, Cash and cash equivalents $ 38,466 $ 38,016 Restricted cash 1,540 1,773 Cash, cash equivalents and restricted cash $ 40,006 $ 39,789 The Company’s restricted cash primarily consisted of cash to support the Company’s iPhone Upgrade Program. Substantially all of the Company’s restricted cash was included in other non-current assets in the Condensed Consolidated Balance Sheets. 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 March 27, 2021, the Company’s hedged term debt– and marketable securities–related foreign currency transactions are expected to be recognized within 21 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 March 27, 2021, the Company’s hedged interest rate transactions are expected to be recognized within seven years. Cash Flow Hedges Cash flow hedge amounts that are included in the assessment of hedge effectiveness are deferred 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 (“OI&E”) in the same period as the related income or expense is recognized. For options designated as cash flow hedges, the time value is excluded from the assessment of hedge effectiveness and recognized in the financial statement line item to which the hedge relates on a straight-line basis over the life of the hedge. Changes in the fair value of amounts excluded from the assessment of hedge effectiveness are recognized in other comprehensive income/(loss) (“OCI”). 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 OI&E in the period of de-designation. Any subsequent changes in fair value of such derivative instruments are reflected in OI&E unless they are re-designated as hedges of other transactions. Net Investment Hedges Net investment hedge amounts that are included in the assessment of hedge effectiveness are recorded in OCI as a part of the cumulative translation adjustment. For foreign exchange forward contracts designated as net investment hedges, the forward carry component is excluded from the assessment of hedge effectiveness and recognized in OCI on a straight-line basis over the life of the hedge. Changes in the fair value of amounts excluded from the assessment of hedge effectiveness are recognized in OCI. Fair Value Hedges Fair value hedge gains and losses related to amounts that are included in the assessment of hedge effectiveness are recognized in earnings along with a corresponding loss or gain related to the change in value of the hedged item in the same line in the Condensed Consolidated Statements of Operations. For foreign exchange forward contracts designated as fair value hedges, the forward carry component is excluded from the assessment of hedge effectiveness and recognized in OI&E on a straight-line basis over the life of the hedge. Amounts excluded from the effectiveness assessment of fair value hedges and recognized in OI&E were gains of $60 million and $142 million for the three- and six-month periods ended March 27, 2021, respectively, and were gains of $126 million and $254 million for the three- and six-month periods ended March 28, 2020, respectively. Changes in the fair value of amounts excluded from the assessment of hedge effectiveness are recognized in OCI. 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. 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 March 27, 2021 and September 26, 2020 (in millions): March 27, 2021 Fair Value of Fair Value of Total Derivative assets (1) : Foreign exchange contracts $ 717 $ 778 $ 1,495 Interest rate contracts $ 923 $ — $ 923 Derivative liabilities (2) : Foreign exchange contracts $ 1,014 $ 702 $ 1,716 September 26, 2020 Fair Value of Fair Value of Total Derivative assets (1) : Foreign exchange contracts $ 749 $ 303 $ 1,052 Interest rate contracts $ 1,557 $ — $ 1,557 Derivative liabilities (2) : Foreign exchange contracts $ 1,561 $ 485 $ 2,046 (1) The fair value of derivative assets is measured using Level 2 fair value inputs and is included in 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 included in 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 and net investment hedges in OCI and the Condensed Consolidated Statements of Operations for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Gains/(Losses) recognized in OCI – included in effectiveness assessment: Cash flow hedges: Foreign exchange contracts $ 338 $ (462) $ 147 $ (191) Interest rate contracts 39 (66) 93 (66) Total $ 377 $ (528) $ 240 $ (257) Net investment hedges: Foreign currency debt $ — $ 11 $ — $ 35 Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment: Cash flow hedges: Foreign exchange contracts $ (885) $ (817) $ (571) $ (326) Interest rate contracts (2) (1) (5) (3) Total $ (887) $ (818) $ (576) $ (329) Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI were a gain of $41 million and a loss of $97 million for the three- and six-month periods ended March 27, 2021, respectively, and were gains of $258 million and $169 million for the three- and six-month periods ended March 28, 2020, respectively. The following tables show information about the Company’s derivative instruments designated as fair value hedges and the related hedged items for the three- and six-month periods ended March 27, 2021 and March 28, 2020 and as of March 27, 2021 and September 26, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Gains/(Losses) on derivative instruments (1) : Foreign exchange contracts $ 570 $ 436 $ (183) $ 253 Interest rate contracts (451) 1,290 (618) 1,128 Total $ 119 $ 1,726 $ (801) $ 1,381 Gains/(Losses) related to hedged items (1) : Marketable securities $ (569) $ (436) $ 183 $ (253) Fixed-rate debt 451 (1,290) 618 (1,128) Total $ (118) $ (1,726) $ 801 $ (1,381) March 27, September 26, Carrying amounts of hedged assets/(liabilities): Marketable securities (2) $ 16,423 $ 16,270 Fixed-rate debt (3) $ (18,416) $ (21,033) Cumulative hedging adjustments included in the carrying amounts of hedged items: Marketable securities carrying amount increases/(decreases) $ 403 $ 493 Fixed-rate debt carrying amount (increases)/decreases $ (923) $ (1,541) (1) Gains and losses related to fair value hedges are included in OI&E in the Condensed Consolidated Statements of Operations. (2) The carrying amounts of marketable securities that are designated as hedged items in fair value hedges are included in current marketable securities and non-current marketable securities in the Condensed Consolidated Balance Sheets (3) The carrying amounts of fixed-rate debt instruments that are designated as hedged items in fair value hedges are included in current term debt and non-current term debt in the Condensed Consolidated Balance Sheets. 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 March 27, 2021 and September 26, 2020 (in millions): March 27, 2021 September 26, 2020 Notional Credit Risk Notional Credit Risk Instruments designated as accounting hedges: Foreign exchange contracts $ 53,312 $ 717 $ 57,410 $ 749 Interest rate contracts $ 17,500 $ 923 $ 20,700 $ 1,557 Instruments not designated as accounting hedges: Foreign exchange contracts $ 104,434 $ 778 $ 88,636 $ 303 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. As of March 27, 2021 and September 26, 2020, the net cash collateral received by the Company related to derivative instruments under its collateral security arrangements was $935 million and $875 million, respectively. The Company includes gross collateral posted and received in other current assets and other current liabilities in the Condensed Consolidated Balance Sheets, respectively. 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 March 27, 2021 and September 26, 2020, 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 $2.4 billion and $2.8 billion, respectively, resulting in net derivative liabilities of $233 million and $312 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 March 27, 2021, the Company had one customer that represented 10% or more of total trade receivables, which accounted for 13%. As of September 26, 2020, the Company had no customers that individually represented 10% or more of total trade receivables. The Company’s cellular network carriers accounted for 35% of total trade receivables as of March 27, 2021. 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 March 27, 2021, the Company had one vendor that represented 10% or more of total vendor non-trade receivables, which accounted for 65%. As of September 26, 2020, the Company had two vendors that individually represented 10% or more of total vendor non-trade receivables, which accounted for 57%, and 11%.

Condensed Consolidated Financia

Condensed Consolidated Financial Statement Details	6 Months Ended
	Mar. 27, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Consolidated Financial Statement Details	Condensed Consolidated Financial Statement Details The following tables show the Company’s condensed consolidated financial statement details as of March 27, 2021 and September 26, 2020 (in millions): Property, Plant and Equipment, Net March 27, September 26, Land and buildings $ 19,000 $ 17,952 Machinery, equipment and internal-use software 77,841 75,291 Leasehold improvements 10,439 10,283 Gross property, plant and equipment 107,280 103,526 Accumulated depreciation and amortization (69,465) (66,760) Total property, plant and equipment, net $ 37,815 $ 36,766 Other Non-Current Liabilities March 27, September 26, Long-term taxes payable $ 25,162 $ 28,170 Other non-current liabilities 27,791 26,320 Total other non-current liabilities $ 52,953 $ 54,490 Other Income/(Expense), Net The following table shows the detail of OI&E for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Interest and dividend income $ 718 $ 1,049 $ 1,465 $ 2,094 Interest expense (670) (757) (1,308) (1,542) Other income/(expense), net 460 (10) 396 79 Total other income/(expense), net $ 508 $ 282 $ 553 $ 631

Income Taxes

Income Taxes	6 Months Ended
	Mar. 27, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Uncertain Tax Positions As of March 27, 2021, the total amount of gross unrecognized tax benefits was $16.9 billion, of which $8.3 billion, if recognized, would impact the Company’s effective tax rate. The Company had accrued $1.6 billion of gross interest and penalties related to income tax matters as of March 27, 2021. The Company is subject to taxation and files income tax returns in the U.S. federal jurisdiction and many state and foreign jurisd ictions. The U.S. Internal Revenue Service concluded its review of the years 2013 through 2015 in 2018, and all years before 2016 are closed. Tax years after 2014 remain open in certain major foreign jurisdictions and are 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 the 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 in the next 12 months by as much as $3.1 billion. 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. Irish legislative changes, effective as of January 2015, eliminated the application of the tax opinions from that date forward. The recovery amount was calculated to be €13.1 billion, plus interest of €1.2 billion. The Company and Ireland appealed the State Aid Decision to the General Court of the Court of Justice of the European Union (the “General Court”). On July 15, 2020, the General Court annulled the State Aid Decision. On September 25, 2020, the European Commission appealed the General Court’s decision to the European Court of Justice. 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 U.S. Tax Cuts and Jobs Act of 2017. On an annual basis, the Company may request approval from the Irish Minister for Finance to reduce the recovery amount for certain taxes paid to other countries. As of March 27, 2021, the adjusted recovery amount was €12.9 billion, excluding interest. The adjusted recovery amount plus interest is funded into escrow, where it will remain restricted from general use pending the conclusion of all legal proceedings. Refer to the Cash, Cash Equivalents and Marketable Securities section of Note 3, “Financial Instruments” for more information.

Debt

Debt	6 Months Ended
	Mar. 27, 2021
Debt Disclosure [Abstract]
Debt	Debt Commercial Paper and Repurchase Agreement 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 March 27, 2021 and September 26, 2020, the Company had $5.0 billion of Commercial Paper outstanding, with maturities generally less than nine months. The weighted-average interest rate of the Company’s Commercial Paper was 0.06% and 0.62% as of March 27, 2021 and September 26, 2020, respectively. The following table provides a summary of cash flows associated with the issuance and maturities of Commercial Paper for the six months ended March 27, 2021 and March 28, 2020 (in millions): Six Months Ended March 27, March 28, Maturities 90 days or less: Proceeds from commercial paper, net $ 2,008 $ 1,377 Maturities greater than 90 days: Proceeds from commercial paper 1,368 4,797 Repayments of commercial paper (3,354) (4,656) Proceeds from/(Repayments of) commercial paper, net (1,986) 141 Total proceeds from commercial paper, net $ 22 $ 1,518 In the second quarter of 2020, the Company entered into an agreement to sell certain of its marketable securities with a promise to repurchase the securities at a specified time and amount (“Repo”). Due to the Company’s continuing involvement with the marketable securities, the Company accounted for the Repo as a collateralized borrowing. As of September 26, 2020, the Repo had been settled. Term Debt As of March 27, 2021, the Company had outstanding floating- and fixed-rate notes with varying maturities for an aggregate principal amount of $116.0 billion (collectively the “Notes”). The Notes are senior unsecured obligations and interest is payable in arrears. The following table provides a summary of the Company’s term debt as of March 27, 2021 and September 26, 2020: Maturities (calendar year) March 27, 2021 September 26, 2020 Amount (in millions) Effective Amount (in millions) Effective 2013 – 2020 debt issuances: Floating-rate notes 2022 $ 1,750 0.55% – 0.69% $ 2,250 0.60% – 1.39% Fixed-rate 0.000% – 4.650% notes 2021 – 2060 100,255 0.03% – 4.78% 103,828 0.03% – 4.78% 2021 debt issuance: Fixed-rate 0.700% – 2.800% notes 2026 – 2061 14,000 0.75% – 2.81% — — % Total term debt 116,005 106,078 Unamortized premium/(discount) and issuance costs, net (371) (314) Hedge accounting fair value adjustments 1,011 1,676 Less: Current portion of term debt (8,003) (8,773) Total non-current portion of term debt $ 108,642 $ 98,667 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. 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 $657 million and $1.3 billion of interest cost on its term debt for the three- and six-month periods ended March 27, 2021, respectively. The Company recognized $725 million and $1.5 billion of interest cost on its term debt for the three- and six-month periods ended March 28, 2020, respectively. As of March 27, 2021 and September 26, 2020, the fair value of the Company’s Notes, based on Level 2 inputs, was $121.2 billion and $117.1 billion, respectively.

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Mar. 27, 2021
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Share Repurchase Program As of March 27, 2021, the Company was authorized to purchase up to $225 billion of the Company’s common stock under a share repurchase program (the “Program”). During the six months ended March 27, 2021, the Company repurchased 347 million shares of its common stock for $43.0 billion, bringing the total utilization under the Program to $211.6 billion. On April 28, 2021, the Company announced the Board of Directors increased the Program authorization by $90 billion. The Program does not obligate the Company to acquire any specific number of shares. Under the 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

Comprehensive Income	6 Months Ended
	Mar. 27, 2021
Equity [Abstract]
Comprehensive Income	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 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 items, for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended Comprehensive Income Components Financial Statement Line Items March 27, March 28, March 27, March 28, Unrealized (gains)/losses on derivative instruments: Foreign exchange contracts Total net sales $ 314 $ 34 $ 418 $ (63) Total cost of sales 406 12 651 (159) Other income/(expense), net 193 771 (435) 548 Interest rate contracts Other income/(expense), net 2 1 5 3 915 818 639 329 Unrealized (gains)/losses on marketable debt securities Other income/(expense), net (96) 37 (214) 24 Total amounts reclassified from AOCI $ 819 $ 855 $ 425 $ 353 The following table shows the changes in AOCI by component for the six months ended March 27, 2021 (in millions): Cumulative Foreign Unrealized Gains/Losses Unrealized Gains/Losses Total Balances as of September 26, 2020 $ (1,375) $ (877) $ 1,846 $ (406) Other comprehensive income/(loss) before reclassifications 471 111 (1,067) (485) Amounts reclassified from AOCI — 639 (214) 425 Tax effect — (146) 326 180 Other comprehensive income/(loss) 471 604 (955) 120 Balances as of March 27, 2021 $ (904) $ (273) $ 891 $ (286)

Benefit Plans

Benefit Plans	6 Months Ended
	Mar. 27, 2021
Share-based Payment Arrangement [Abstract]
Benefit Plans	Benefit Plans Stock Plans The Company had 718 million shares reserved for future issuance under its stock plans as of March 27, 2021. 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. RSUs granted under the Company’s stock plans reduce the number of shares available for grant under the plans by a factor of two times the number of RSUs granted. 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 March 27, 2021, Section 16 officers Katherine L. Adams, Timothy D. Cook, Chris Kondo, Luca Maestri, Deirdre O’Brien 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 under the Company’s employee and director equity plans. Restricted Stock Units A summary of the Company’s RSU activity and related information for the six months ended March 27, 2021 is as follows: Number of RSUs (in thousands) Weighted-Average Aggregate Fair Value (in millions) Balance as of September 26, 2020 310,778 $ 51.58 RSUs granted 79,068 $ 113.39 RSUs vested (75,295) $ 45.83 RSUs canceled (5,918) $ 63.67 Balance as of March 27, 2021 308,633 $ 68.58 $ 37,409 The fair value as of the respective vesting dates of RSUs was $867 million and $9.4 billion for the three- and six-month periods ended March 27, 2021, respectively, and was $558 million and $4.8 billion for the three- and six-month periods ended March 28, 2020, 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- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Share-based compensation expense $ 1,981 $ 1,697 $ 4,001 $ 3,407 Income tax benefit related to share-based compensation expense $ (575) $ (444) $ (2,199) $ (1,202) As of March 27, 2021, the total unrecognized compensation cost related to outstanding RSUs and stock options was $16.7 billion, which the Company expects to recognize over a weighted-average period of 2.8 years.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 27, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Accrued Warranty and Guarantees The following table shows changes in the Company’s accrued warranties and related costs for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Beginning accrued warranty and related costs $ 4,124 $ 3,873 $ 3,354 $ 3,570 Cost of warranty claims (649) (689) (1,372) (1,604) Accruals for product warranty 309 739 1,802 1,957 Ending accrued warranty and related costs $ 3,784 $ 3,923 $ 3,784 $ 3,923 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 China mainland. 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. 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. The Company also competes for various components with other participants in the markets for smartphones, personal computers, tablets and other electronic devices. 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. 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 their manufacturing capacities have increased. The 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. 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. 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 content creation, Internet and telecommunications services and supplier arrangements. As of March 27, 2021, the Company’s total future payments under noncancelable unconditional purchase obligations having a remaining term in excess of one year were $8.2 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 resolved. The outcome of litigation is inherently uncertain. When a loss related to a legal proceeding or claim is probable and reasonably estimable, the Company accrues its best estimate for the ultimate resolution of the matter. If one or more legal matters were resolved against the Company in a reporting period for amounts above 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 greater than a recorded accrual, concerning loss contingencies for asserted legal and other claims, except for the following matters: VirnetX VirnetX, Inc. (“VirnetX”) filed a lawsuit against the Company alleging that certain of the Company’s products infringe on patents owned by VirnetX. On April 11, 2018, a jury returned a verdict against the Company in the U.S. District Court for the Eastern District of Texas (the “Eastern Texas District Court”). The Company appealed the verdict to the U.S. Court of Appeals for the Federal Circuit, which remanded the case back to the Eastern Texas District Court, where a re-trial was held in October 2020. The jury returned a verdict against the Company and awarded damages of $503 million, which the Company has appealed. The Company has challenged the validity of the patents at issue in the re-trial at the U.S. Patent and Trademark Office (the “PTO”), and the PTO has declared the patents invalid, subject to further appeal by VirnetX. iOS Performance Management Cases On April 5, 2018, several U.S. federal actions 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, were consolidated through a Multidistrict Litigation process into a single action in the U.S. District Court for the Northern District of California (the “Northern California District Court”). On February 28, 2020, the parties in the Multidistrict Litigation reached a settlement to resolve the U.S. federal and California state class actions. On March 18, 2021, the Northern California District Court granted final approval of the Multidistrict Litigation settlement, which will result in an aggregate payment of $310 million to settle all claims. The Company continues to believe 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. French Competition Authority On March 16, 2020, the French Competition Authority (“FCA”) announced its decision that aspects of the Company’s sales and distribution practices in France violate French competition law and issued a fine of €1.1 billion. The Company strongly disagrees with the FCA’s decision and has appealed. Optis Optis Wireless Technology, LLC and related entities (“Optis”) filed a lawsuit in the U.S. District Court for the Eastern District of Texas against the Company alleging that certain of the Company’s products infringe on patents owned by Optis. On August 11, 2020, a jury returned a verdict against the Company and awarded damages of $506 million. In post-trial proceedings, the damages portion of the verdict was set aside, and the case remains pending further proceedings.

Segment Information and Geograp

Segment Information and Geographic Data	6 Months Ended
	Mar. 27, 2021
Segment Reporting [Abstract]
Segment Information and Geographic Data	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 mainland, 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 2020 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- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Americas: Net sales $ 34,306 $ 25,473 $ 80,616 $ 66,840 Operating income $ 12,050 $ 7,261 $ 27,835 $ 20,353 Europe: Net sales $ 22,264 $ 14,294 $ 49,570 $ 37,567 Operating income $ 8,265 $ 4,528 $ 17,854 $ 12,247 Greater China: Net sales $ 17,728 $ 9,455 $ 39,041 $ 23,033 Operating income $ 7,758 $ 3,758 $ 16,288 $ 9,121 Japan: Net sales $ 7,742 $ 5,206 $ 16,027 $ 11,429 Operating income $ 3,428 $ 2,236 $ 6,931 $ 5,014 Rest of Asia Pacific: Net sales $ 7,544 $ 3,885 $ 15,769 $ 11,263 Operating income $ 2,736 $ 1,290 $ 5,689 $ 4,021 A reconciliation of the Company’s segment operating income to the Condensed Consolidated Statements of Operations for the three- and six-month periods ended March 27, 2021 and March 28, 2020 is as follows (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Segment operating income $ 34,237 $ 19,073 $ 74,597 $ 50,756 Research and development expense (5,262) (4,565) (10,425) (9,016) Other corporate expenses, net (1,472) (1,655) (3,135) (3,318) Total operating income $ 27,503 $ 12,853 $ 61,037 $ 38,422

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 27, 2021
Accounting Policies [Abstract]
Basis of Presentation and Preparation	Basis of Presentation and Preparation The condensed consolidated financial statements include the accounts of Apple Inc. and its wholly owned subsidiaries (collectively “Apple” or 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 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 accompanying notes included in its Annual Report on Form 10-K for the fiscal year ended September 26, 2020 (the “2020 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. An additional 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 2021 and 2020 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.
Common Stock Split	Common Stock Split On August 28, 2020, the Company effected a four-for-one stock split to shareholders of record as of August 24, 2020. All share, restricted stock unit (“RSU”) and per share or per RSU information has been retroactively adjusted to reflect the stock split.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Financial Instruments – Credit Losses At the beginning of the first quarter of 2021, the Company adopted the Financial Accounting Standards Board’s Accounting Standards Update No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which modifies the measurement of expected credit losses on certain financial instruments. The Company adopted ASU 2016-13 utilizing the modified retrospective transition method. The adoption of ASU 2016-13 did not have a material impact on the Company’s condensed consolidated financial statements.
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 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 distinct, the Company allocates revenue to all distinct performance obligations based on their relative stand-alone selling prices (“SSPs”). When available, the Company uses observable prices to determine SSPs. 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 can 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 ® and certain digital content sold through the Company’s other digital content stores, 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.
Fair Value Measurements	Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities.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.
Derivative Financial Instruments	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 March 27, 2021, the Company’s hedged term debt– and marketable securities–related foreign currency transactions are expected to be recognized within 21 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 March 27, 2021, the Company’s hedged interest rate transactions are expected to be recognized within seven years. Cash Flow Hedges Cash flow hedge amounts that are included in the assessment of hedge effectiveness are deferred 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 (“OI&E”) in the same period as the related income or expense is recognized. For options designated as cash flow hedges, the time value is excluded from the assessment of hedge effectiveness and recognized in the financial statement line item to which the hedge relates on a straight-line basis over the life of the hedge. Changes in the fair value of amounts excluded from the assessment of hedge effectiveness are recognized in other comprehensive income/(loss) (“OCI”). 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 OI&E in the period of de-designation. Any subsequent changes in fair value of such derivative instruments are reflected in OI&E unless they are re-designated as hedges of other transactions. Net Investment Hedges Net investment hedge amounts that are included in the assessment of hedge effectiveness are recorded in OCI as a part of the cumulative translation adjustment. For foreign exchange forward contracts designated as net investment hedges, the forward carry component is excluded from the assessment of hedge effectiveness and recognized in OCI on a straight-line basis over the life of the hedge. Changes in the fair value of amounts excluded from the assessment of hedge effectiveness are recognized in OCI. Fair Value Hedges 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 mainland, 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 2020 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 Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Mar. 27, 2021
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- and six-month periods ended March 27, 2021 and March 28, 2020 (net income in millions and shares in thousands): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Numerator: Net income $ 23,630 $ 11,249 $ 52,385 $ 33,485 Denominator: Weighted-average basic shares outstanding 16,753,476 17,440,402 16,844,298 17,550,281 Effect of dilutive securities 175,681 178,363 177,125 168,310 Weighted-average diluted shares 16,929,157 17,618,765 17,021,423 17,718,591 Basic earnings per share $ 1.41 $ 0.64 $ 3.11 $ 1.91 Diluted earnings per share $ 1.40 $ 0.64 $ 3.08 $ 1.89

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Mar. 27, 2021
Revenue from Contract with Customer [Abstract]
Net Sales Disaggregated by Significant Products and Services	Net sales disaggregated by significant products and services for the three- and six-month periods ended March 27, 2021 and March 28, 2020 were as follows (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, iPhone (1) $ 47,938 $ 28,962 $ 113,535 $ 84,919 Mac (1) 9,102 5,351 17,777 12,511 iPad (1) 7,807 4,368 16,242 10,345 Wearables, Home and Accessories (1)(2) 7,836 6,284 20,807 16,294 Services (3) 16,901 13,348 32,662 26,063 Total net sales (4) $ 89,584 $ 58,313 $ 201,023 $ 150,132 (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 the Company’s advertising, AppleCare ® , digital content and other services. Services net sales also include amortization of the deferred value of Maps, Siri, and free iCloud storage and Apple TV+ SM services, which are bundled in the sales price of certain products. (4) Includes $2.7 billion of revenue recognized in the three months ended March 27, 2021 that was included in deferred revenue as of December 26, 2020, $1.9 billion of revenue recognized in the three months ended March 28, 2020 that was included in deferred revenue as of December 28, 2019, $4.1 billion of revenue recognized in the six months ended March 27, 2021 that was included in deferred revenue as of September 26, 2020, and $3.0 billion of revenue recognized in the six months ended March 28, 2020 that was included in deferred revenue as of September 28, 2019.

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Mar. 27, 2021
Investments, All Other Investments [Abstract]
Cash and Marketable Securities by Significant Investment Category	The following tables show the Company’s cash and marketable securities by significant investment category as of March 27, 2021 and September 26, 2020 (in millions): March 27, 2021 Adjusted Unrealized Unrealized Fair Cash and Current Non-Current Marketable Cash $ 19,444 $ — $ — $ 19,444 $ 19,444 $ — $ — Level 1 (1) : Money market funds 11,998 — — 11,998 11,998 — — Mutual funds 143 1 (2) 142 — 142 — Subtotal 12,141 1 (2) 12,140 11,998 142 — Level 2 (2) : U.S. Treasury securities 21,331 168 (149) 21,350 205 8,058 13,087 U.S. agency securities 8,228 5 (72) 8,161 — 3,212 4,949 Non-U.S. government securities 19,849 211 (169) 19,891 200 2,881 16,810 Certificates of deposit and time deposits 7,198 — — 7,198 5,814 1,114 270 Commercial paper 3,353 — — 3,353 805 2,548 — Corporate debt securities 88,108 1,506 (444) 89,170 — 13,036 76,134 Municipal securities 980 16 (1) 995 — 136 859 Mortgage- and asset-backed securities 22,624 234 (187) 22,671 — 241 22,430 Subtotal 171,671 2,140 (1,022) 172,789 7,024 31,226 134,539 Total (3) $ 203,256 $ 2,141 $ (1,024) $ 204,373 $ 38,466 $ 31,368 $ 134,539 September 26, 2020 Adjusted Unrealized Unrealized Fair Cash and Current Non-Current Cash $ 17,773 $ — $ — $ 17,773 $ 17,773 $ — $ — Level 1 (1) : Money market funds 2,171 — — 2,171 2,171 — — Level 2 (2) : U.S. Treasury securities 28,439 331 — 28,770 8,580 11,972 8,218 U.S. agency securities 8,604 8 — 8,612 2,009 3,078 3,525 Non-U.S. government securities 19,361 275 (186) 19,450 255 3,329 15,866 Certificates of deposit and time deposits 10,399 — — 10,399 4,043 6,246 110 Commercial paper 11,226 — — 11,226 3,185 8,041 — Corporate debt securities 76,937 1,834 (175) 78,596 — 19,687 58,909 Municipal securities 1,001 22 — 1,023 — 139 884 Mortgage- and asset-backed securities 13,520 314 (24) 13,810 — 435 13,375 Subtotal 169,487 2,784 (385) 171,886 18,072 52,927 100,887 Total (3) $ 189,431 $ 2,784 $ (385) $ 191,830 $ 38,016 $ 52,927 $ 100,887 (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 March 27, 2021 and September 26, 2020, total marketable securities included $19.0 billion and $18.6 billion, respectively, that was restricted from general use, related to the State Aid Decision (refer to Note 5, “Income Taxes”) and other agreements.
Non-Current Marketable Debt Securities by Contractual Maturity	The following table shows the fair value of the Company’s non-current marketable debt securities, by contractual maturity, as of March 27, 2021 (in millions): Due after 1 year through 5 years $ 83,364 Due after 5 years through 10 years 28,835 Due after 10 years 22,340 Total fair value $ 134,539
Cash, Cash Equivalents and Restricted Cash Reconciliation	A reconciliation of the Company’s cash and cash equivalents in the Condensed Consolidated Balance Sheets to cash, cash equivalents and restricted cash in the Condensed Consolidated Statements of Cash Flows as of March 27, 2021 and September 26, 2020 is as follows (in millions): March 27, September 26, Cash and cash equivalents $ 38,466 $ 38,016 Restricted cash 1,540 1,773 Cash, cash equivalents and restricted cash $ 40,006 $ 39,789
Derivative Instruments at Gross Fair Value	The following tables show the Company’s derivative instruments at gross fair value as of March 27, 2021 and September 26, 2020 (in millions): March 27, 2021 Fair Value of Fair Value of Total Derivative assets (1) : Foreign exchange contracts $ 717 $ 778 $ 1,495 Interest rate contracts $ 923 $ — $ 923 Derivative liabilities (2) : Foreign exchange contracts $ 1,014 $ 702 $ 1,716 September 26, 2020 Fair Value of Fair Value of Total Derivative assets (1) : Foreign exchange contracts $ 749 $ 303 $ 1,052 Interest rate contracts $ 1,557 $ — $ 1,557 Derivative liabilities (2) : Foreign exchange contracts $ 1,561 $ 485 $ 2,046 (1) The fair value of derivative assets is measured using Level 2 fair value inputs and is included in 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 included in 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 and Net Investment Hedges	The following table shows the pre-tax gains and losses of the Company’s derivative and non-derivative instruments designated as cash flow and net investment hedges in OCI and the Condensed Consolidated Statements of Operations for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Gains/(Losses) recognized in OCI – included in effectiveness assessment: Cash flow hedges: Foreign exchange contracts $ 338 $ (462) $ 147 $ (191) Interest rate contracts 39 (66) 93 (66) Total $ 377 $ (528) $ 240 $ (257) Net investment hedges: Foreign currency debt $ — $ 11 $ — $ 35 Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment: Cash flow hedges: Foreign exchange contracts $ (885) $ (817) $ (571) $ (326) Interest rate contracts (2) (1) (5) (3) Total $ (887) $ (818) $ (576) $ (329)
Derivative Instruments Designated as Fair Value Hedges and the Related Hedged Items	The following tables show information about the Company’s derivative instruments designated as fair value hedges and the related hedged items for the three- and six-month periods ended March 27, 2021 and March 28, 2020 and as of March 27, 2021 and September 26, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Gains/(Losses) on derivative instruments (1) : Foreign exchange contracts $ 570 $ 436 $ (183) $ 253 Interest rate contracts (451) 1,290 (618) 1,128 Total $ 119 $ 1,726 $ (801) $ 1,381 Gains/(Losses) related to hedged items (1) : Marketable securities $ (569) $ (436) $ 183 $ (253) Fixed-rate debt 451 (1,290) 618 (1,128) Total $ (118) $ (1,726) $ 801 $ (1,381) March 27, September 26, Carrying amounts of hedged assets/(liabilities): Marketable securities (2) $ 16,423 $ 16,270 Fixed-rate debt (3) $ (18,416) $ (21,033) Cumulative hedging adjustments included in the carrying amounts of hedged items: Marketable securities carrying amount increases/(decreases) $ 403 $ 493 Fixed-rate debt carrying amount (increases)/decreases $ (923) $ (1,541) (1) Gains and losses related to fair value hedges are included in OI&E in the Condensed Consolidated Statements of Operations. (2) The carrying amounts of marketable securities that are designated as hedged items in fair value hedges are included in current marketable securities and non-current marketable securities in the Condensed Consolidated Balance Sheets (3) The carrying amounts of fixed-rate debt instruments that are designated as hedged items in fair value hedges are included in current term debt and non-current term debt in the Condensed Consolidated Balance Sheets.
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 March 27, 2021 and September 26, 2020 (in millions): March 27, 2021 September 26, 2020 Notional Credit Risk Notional Credit Risk Instruments designated as accounting hedges: Foreign exchange contracts $ 53,312 $ 717 $ 57,410 $ 749 Interest rate contracts $ 17,500 $ 923 $ 20,700 $ 1,557 Instruments not designated as accounting hedges: Foreign exchange contracts $ 104,434 $ 778 $ 88,636 $ 303

Condensed Consolidated Financ_2

Condensed Consolidated Financial Statement Details (Tables)	6 Months Ended
	Mar. 27, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net March 27, September 26, Land and buildings $ 19,000 $ 17,952 Machinery, equipment and internal-use software 77,841 75,291 Leasehold improvements 10,439 10,283 Gross property, plant and equipment 107,280 103,526 Accumulated depreciation and amortization (69,465) (66,760) Total property, plant and equipment, net $ 37,815 $ 36,766
Other Non-Current Liabilities	Other Non-Current Liabilities March 27, September 26, Long-term taxes payable $ 25,162 $ 28,170 Other non-current liabilities 27,791 26,320 Total other non-current liabilities $ 52,953 $ 54,490
Other Income/(Expense), Net	Other Income/(Expense), Net The following table shows the detail of OI&E for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Interest and dividend income $ 718 $ 1,049 $ 1,465 $ 2,094 Interest expense (670) (757) (1,308) (1,542) Other income/(expense), net 460 (10) 396 79 Total other income/(expense), net $ 508 $ 282 $ 553 $ 631

Debt (Tables)

Debt (Tables)	6 Months Ended
	Mar. 27, 2021
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 six months ended March 27, 2021 and March 28, 2020 (in millions): Six Months Ended March 27, March 28, Maturities 90 days or less: Proceeds from commercial paper, net $ 2,008 $ 1,377 Maturities greater than 90 days: Proceeds from commercial paper 1,368 4,797 Repayments of commercial paper (3,354) (4,656) Proceeds from/(Repayments of) commercial paper, net (1,986) 141 Total proceeds from commercial paper, net $ 22 $ 1,518
Summary of Term Debt	The following table provides a summary of the Company’s term debt as of March 27, 2021 and September 26, 2020: Maturities (calendar year) March 27, 2021 September 26, 2020 Amount (in millions) Effective Amount (in millions) Effective 2013 – 2020 debt issuances: Floating-rate notes 2022 $ 1,750 0.55% – 0.69% $ 2,250 0.60% – 1.39% Fixed-rate 0.000% – 4.650% notes 2021 – 2060 100,255 0.03% – 4.78% 103,828 0.03% – 4.78% 2021 debt issuance: Fixed-rate 0.700% – 2.800% notes 2026 – 2061 14,000 0.75% – 2.81% — — % Total term debt 116,005 106,078 Unamortized premium/(discount) and issuance costs, net (371) (314) Hedge accounting fair value adjustments 1,011 1,676 Less: Current portion of term debt (8,003) (8,773) Total non-current portion of term debt $ 108,642 $ 98,667

Comprehensive Income (Tables)

Comprehensive Income (Tables)	6 Months Ended
	Mar. 27, 2021
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 items, for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended Comprehensive Income Components Financial Statement Line Items March 27, March 28, March 27, March 28, Unrealized (gains)/losses on derivative instruments: Foreign exchange contracts Total net sales $ 314 $ 34 $ 418 $ (63) Total cost of sales 406 12 651 (159) Other income/(expense), net 193 771 (435) 548 Interest rate contracts Other income/(expense), net 2 1 5 3 915 818 639 329 Unrealized (gains)/losses on marketable debt securities Other income/(expense), net (96) 37 (214) 24 Total amounts reclassified from AOCI $ 819 $ 855 $ 425 $ 353
Changes in AOCI by Component	The following table shows the changes in AOCI by component for the six months ended March 27, 2021 (in millions): Cumulative Foreign Unrealized Gains/Losses Unrealized Gains/Losses Total Balances as of September 26, 2020 $ (1,375) $ (877) $ 1,846 $ (406) Other comprehensive income/(loss) before reclassifications 471 111 (1,067) (485) Amounts reclassified from AOCI — 639 (214) 425 Tax effect — (146) 326 180 Other comprehensive income/(loss) 471 604 (955) 120 Balances as of March 27, 2021 $ (904) $ (273) $ 891 $ (286)

Benefit Plans (Tables)

Benefit Plans (Tables)	6 Months Ended
	Mar. 27, 2021
Share-based Payment Arrangement [Abstract]
Restricted Stock Unit Activity	A summary of the Company’s RSU activity and related information for the six months ended March 27, 2021 is as follows: Number of RSUs (in thousands) Weighted-Average Aggregate Fair Value (in millions) Balance as of September 26, 2020 310,778 $ 51.58 RSUs granted 79,068 $ 113.39 RSUs vested (75,295) $ 45.83 RSUs canceled (5,918) $ 63.67 Balance as of March 27, 2021 308,633 $ 68.58 $ 37,409
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- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Share-based compensation expense $ 1,981 $ 1,697 $ 4,001 $ 3,407 Income tax benefit related to share-based compensation expense $ (575) $ (444) $ (2,199) $ (1,202)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Mar. 27, 2021
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- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Beginning accrued warranty and related costs $ 4,124 $ 3,873 $ 3,354 $ 3,570 Cost of warranty claims (649) (689) (1,372) (1,604) Accruals for product warranty 309 739 1,802 1,957 Ending accrued warranty and related costs $ 3,784 $ 3,923 $ 3,784 $ 3,923

Segment Information and Geogr_2

Segment Information and Geographic Data (Tables)	6 Months Ended
	Mar. 27, 2021
Segment Reporting [Abstract]
Information by Reportable Segment	The following table shows information by reportable segment for the three- and six-month periods ended March 27, 2021 and March 28, 2020 (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Americas: Net sales $ 34,306 $ 25,473 $ 80,616 $ 66,840 Operating income $ 12,050 $ 7,261 $ 27,835 $ 20,353 Europe: Net sales $ 22,264 $ 14,294 $ 49,570 $ 37,567 Operating income $ 8,265 $ 4,528 $ 17,854 $ 12,247 Greater China: Net sales $ 17,728 $ 9,455 $ 39,041 $ 23,033 Operating income $ 7,758 $ 3,758 $ 16,288 $ 9,121 Japan: Net sales $ 7,742 $ 5,206 $ 16,027 $ 11,429 Operating income $ 3,428 $ 2,236 $ 6,931 $ 5,014 Rest of Asia Pacific: Net sales $ 7,544 $ 3,885 $ 15,769 $ 11,263 Operating income $ 2,736 $ 1,290 $ 5,689 $ 4,021
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- and six-month periods ended March 27, 2021 and March 28, 2020 is as follows (in millions): Three Months Ended Six Months Ended March 27, March 28, March 27, March 28, Segment operating income $ 34,237 $ 19,073 $ 74,597 $ 50,756 Research and development expense (5,262) (4,565) (10,425) (9,016) Other corporate expenses, net (1,472) (1,655) (3,135) (3,318) Total operating income $ 27,503 $ 12,853 $ 61,037 $ 38,422

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details)	Aug. 28, 2020
Significant Accounting Policies [Line Items]
Common stock split ratio	4

Summary of Significant Accoun_5

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		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Numerator:
Net income	$ 23,630	$ 11,249	$ 52,385	$ 33,485
Denominator:
Weighted-average basic shares outstanding (in shares)	16,753,476	17,440,402	16,844,298	17,550,281
Effect of dilutive securities (in shares)	175,681	178,363	177,125	168,310
Weighted-average diluted shares (in shares)	16,929,157	17,618,765	17,021,423	17,718,591
Basic earnings per share (in dollars per share)	$ 1.41	$ 0.64	$ 3.11	$ 1.91
Diluted earnings per share (in dollars per share)	$ 1.40	$ 0.64	$ 3.08	$ 1.89

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) $ in Billions	Mar. 27, 2021USD ($)obligation	Sep. 26, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Performance obligations in arrangements (up to) | obligation	3
Total deferred revenue | $	$ 11.9	$ 10.2

Revenue Recognition - Deferred

Revenue Recognition - Deferred Revenue, Expected Timing of Realization (Details)	Mar. 27, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	64.00%
Deferred revenue, expected timing of realization, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-03-27
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	26.00%
Deferred revenue, expected timing of realization, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-02
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	8.00%
Deferred revenue, expected timing of realization, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue, expected timing of realization, percentage	2.00%
Deferred revenue, expected timing of realization, period

Revenue Recognition - Net Sales

Revenue Recognition - Net Sales Disaggregated by Significant Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 89,584	$ 58,313	$ 201,023	$ 150,132
Revenue recognized that was included in deferred revenue at the beginning of the period	2,700	1,900	4,100	3,000
iPhone
Disaggregation of Revenue [Line Items]
Net sales	47,938	28,962	113,535	84,919
Mac
Disaggregation of Revenue [Line Items]
Net sales	9,102	5,351	17,777	12,511
iPad
Disaggregation of Revenue [Line Items]
Net sales	7,807	4,368	16,242	10,345
Wearables, Home and Accessories
Disaggregation of Revenue [Line Items]
Net sales	7,836	6,284	20,807	16,294
Services
Disaggregation of Revenue [Line Items]
Net sales	$ 16,901	$ 13,348	$ 32,662	$ 26,063

Financial Instruments - Cash, C

Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020
Debt Securities, Available-for-sale [Line Items]
Cash and Cash Equivalents	$ 38,466	$ 38,016
Current Marketable Securities	31,368	52,927
Non-Current Marketable Securities	134,539	100,887
Cash, Cash Equivalents and Marketable Securities, Adjusted Cost	203,256	189,431
Cash Equivalents and Marketable Securities, Unrealized Gains	2,141	2,784
Cash Equivalents and Marketable Securities, Unrealized Losses	1,024	385
Cash, Cash Equivalents and Marketable Securities, Fair Value	204,373	191,830
Total marketable securities that were restricted from general use	19,000	18,600
Level 1
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Equity, Adjusted Cost	12,141
Marketable Securities, Equity, Unrealized Gains	1
Marketable Securities, Equity, Unrealized Losses	(2)
Marketable Securities, Equity, Fair Value	12,140
Cash and Cash Equivalents	11,998
Current Marketable Securities	142
Non-Current Marketable Securities	0
Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	171,671	169,487
Marketable Securities, Debt, Unrealized Gains	2,140	2,784
Marketable Securities, Debt, Unrealized Losses	(1,022)	(385)
Marketable Securities, Debt, Fair Value	172,789	171,886
Cash and Cash Equivalents	7,024	18,072
Current Marketable Securities	31,226	52,927
Non-Current Marketable Securities	134,539	100,887
Cash
Debt Securities, Available-for-sale [Line Items]
Cash	19,444	17,773
Cash and Cash Equivalents	19,444	17,773
Current Marketable Securities	0	0
Non-Current Marketable Securities	0	0
Money market funds | Level 1
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Equity, Adjusted Cost	11,998	2,171
Marketable Securities, Equity, Unrealized Gains	0	0
Marketable Securities, Equity, Unrealized Losses	0	0
Marketable Securities, Equity, Fair Value	11,998	2,171
Cash and Cash Equivalents	11,998	2,171
Current Marketable Securities	0	0
Non-Current Marketable Securities	0	0
Mutual funds | Level 1
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Equity, Adjusted Cost	143
Marketable Securities, Equity, Unrealized Gains	1
Marketable Securities, Equity, Unrealized Losses	(2)
Marketable Securities, Equity, Fair Value	142
Cash and Cash Equivalents	0
Current Marketable Securities	142
Non-Current Marketable Securities	0
U.S. Treasury securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	21,331	28,439
Marketable Securities, Debt, Unrealized Gains	168	331
Marketable Securities, Debt, Unrealized Losses	(149)	0
Marketable Securities, Debt, Fair Value	21,350	28,770
Cash and Cash Equivalents	205	8,580
Current Marketable Securities	8,058	11,972
Non-Current Marketable Securities	13,087	8,218
U.S. agency securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	8,228	8,604
Marketable Securities, Debt, Unrealized Gains	5	8
Marketable Securities, Debt, Unrealized Losses	(72)	0
Marketable Securities, Debt, Fair Value	8,161	8,612
Cash and Cash Equivalents	0	2,009
Current Marketable Securities	3,212	3,078
Non-Current Marketable Securities	4,949	3,525
Non-U.S. government securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	19,849	19,361
Marketable Securities, Debt, Unrealized Gains	211	275
Marketable Securities, Debt, Unrealized Losses	(169)	(186)
Marketable Securities, Debt, Fair Value	19,891	19,450
Cash and Cash Equivalents	200	255
Current Marketable Securities	2,881	3,329
Non-Current Marketable Securities	16,810	15,866
Certificates of deposit and time deposits | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	7,198	10,399
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	7,198	10,399
Cash and Cash Equivalents	5,814	4,043
Current Marketable Securities	1,114	6,246
Non-Current Marketable Securities	270	110
Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	3,353	11,226
Marketable Securities, Debt, Unrealized Gains	0	0
Marketable Securities, Debt, Unrealized Losses	0	0
Marketable Securities, Debt, Fair Value	3,353	11,226
Cash and Cash Equivalents	805	3,185
Current Marketable Securities	2,548	8,041
Non-Current Marketable Securities	0	0
Corporate debt securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	88,108	76,937
Marketable Securities, Debt, Unrealized Gains	1,506	1,834
Marketable Securities, Debt, Unrealized Losses	(444)	(175)
Marketable Securities, Debt, Fair Value	89,170	78,596
Cash and Cash Equivalents	0	0
Current Marketable Securities	13,036	19,687
Non-Current Marketable Securities	76,134	58,909
Municipal securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	980	1,001
Marketable Securities, Debt, Unrealized Gains	16	22
Marketable Securities, Debt, Unrealized Losses	(1)	0
Marketable Securities, Debt, Fair Value	995	1,023
Cash and Cash Equivalents	0	0
Current Marketable Securities	136	139
Non-Current Marketable Securities	859	884
Mortgage- and asset-backed securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Marketable Securities, Debt, Adjusted Cost	22,624	13,520
Marketable Securities, Debt, Unrealized Gains	234	314
Marketable Securities, Debt, Unrealized Losses	(187)	(24)
Marketable Securities, Debt, Fair Value	22,671	13,810
Cash and Cash Equivalents	0	0
Current Marketable Securities	241	435
Non-Current Marketable Securities	$ 22,430	$ 13,375

Financial Instruments - Non-Cur

Financial Instruments - Non-Current Marketable Debt Securities by Contractual Maturity (Details) $ in Millions	Mar. 27, 2021USD ($)
Fair value of non-current marketable debt securities by contractual maturity
Due after 1 year through 5 years	$ 83,364
Due after 5 years through 10 years	28,835
Due after 10 years	22,340
Total fair value	$ 134,539

Financial Instruments - Additio

Financial Instruments - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 27, 2021USD ($)CustomerVendor	Mar. 28, 2020USD ($)	Mar. 27, 2021USD ($)CustomerVendor	Mar. 28, 2020USD ($)	Sep. 26, 2020USD ($)CustomerVendor
Financial Instruments [Line Items]
Non-marketable equity securities, carrying value	$ 2,700		$ 2,700		$ 2,800
Hedged interest rate transactions, expected recognition period			7 years
Amounts excluded from the effectiveness assessment of fair value hedges and recognized in OI&E, gains/(losses)	60	$ 126	$ 142	$ 254
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses)	41	$ 258	(97)	$ 169
Net cash collateral received, derivative instruments	935		935		875
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements	2,400		2,400		2,800
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements	2,400		2,400		2,800
Net derivative assets/(liabilities) after potential reductions under master netting arrangements	$ (233)		$ (233)		$ (312)
Trade receivables | Credit concentration risk
Financial Instruments [Line Items]
Number of customers that individually represented 10% or more of total trade receivables | Customer	1		1		0
Trade receivables | Credit concentration risk | Customer one
Financial Instruments [Line Items]
Concentration risk, percentage			13.00%
Trade receivables | Credit concentration risk | Cellular network carriers
Financial Instruments [Line Items]
Concentration risk, percentage			35.00%
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	1		1		2
Non-trade receivables | Credit concentration risk | Vendor one
Financial Instruments [Line Items]
Concentration risk, percentage			65.00%		57.00%
Non-trade receivables | Credit concentration risk | Vendor two
Financial Instruments [Line Items]
Concentration risk, percentage					11.00%
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			21 years

Financial Instruments - Restric

Financial Instruments - Restricted Cash (Details) - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020	Mar. 28, 2020	Sep. 28, 2019
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 38,466	$ 38,016
Restricted cash	$ 1,540	$ 1,773
Restricted cash and cash equivalents, noncurrent, asset, statement of financial position [Extensible List]	Other non-current assets	Other non-current assets
Cash, cash equivalents and restricted cash	$ 40,006	$ 39,789	$ 43,049	$ 50,224

Financial Instruments - Derivat

Financial Instruments - Derivative Instruments at Gross Fair Value (Details) - Level 2 - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020
Other current assets and other non-current assets | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	$ 1,495	$ 1,052
Other current assets and other non-current assets | Interest rate contracts
Derivative assets:
Fair value of derivative assets	923	1,557
Other current assets and other non-current assets | Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	717	749
Other current assets and other non-current assets | Derivatives designated as accounting hedges | Interest rate contracts
Derivative assets:
Fair value of derivative assets	923	1,557
Other current assets and other non-current assets | Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	778	303
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	0
Other current liabilities and other non-current liabilities | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	1,716	2,046
Other current liabilities and other non-current liabilities | Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	1,014	1,561
Other current liabilities and other non-current liabilities | Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	$ 702	$ 485

Financial Instruments - Pre-Tax

Financial Instruments - Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Cash Flow and Net Investment Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges	$ 377	$ (528)	$ 240	$ (257)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges	(887)	(818)	(576)	(329)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges	338	(462)	147	(191)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges	(885)	(817)	(571)	(326)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges	39	(66)	93	(66)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges	(2)	(1)	(5)	(3)
Foreign currency debt
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI – included in effectiveness assessment, net investment hedges	$ 0	$ 11	$ 0	$ 35

Financial Instruments - Deriv_2

Financial Instruments - Derivative Instruments Designated as Fair Value Hedges and Related Hedged Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020	Sep. 26, 2020
Foreign exchange contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Cumulative hedging adjustment increases/(decreases) included in the carrying amount of hedged marketable securities	$ 403		$ 403		$ 493
Interest rate contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Cumulative hedging adjustment (increases)/decreases included in the carrying amount of hedged fixed-rate debt	(923)		(923)		(1,541)
Current marketable securities and non-current marketable securities | Foreign exchange contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Carrying amount of hedged marketable securities	16,423		16,423		16,270
Current term debt and non-current term debt | Interest rate contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Carrying amount of hedged fixed-rate debt	(18,416)		(18,416)		$ (21,033)
OI&E
Gains/(Losses) related to derivative instruments and hedged items:
Gains/(Losses) on derivative instruments	119	$ 1,726	(801)	$ 1,381
Gains/(Losses) related to hedged items	(118)	(1,726)	801	(1,381)
OI&E | Foreign exchange contracts
Gains/(Losses) related to derivative instruments and hedged items:
Gains/(Losses) on derivative instruments	570	436	(183)	253
Gains/(Losses) related to hedged items	(569)	(436)	183	(253)
OI&E | Interest rate contracts
Gains/(Losses) related to derivative instruments and hedged items:
Gains/(Losses) on derivative instruments	(451)	1,290	(618)	1,128
Gains/(Losses) related to hedged items	$ 451	$ (1,290)	$ 618	$ (1,128)

Financial Instruments - Notiona

Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020
Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivatives, notional amount	$ 53,312	$ 57,410
Derivatives, credit risk amount	717	749
Derivatives designated as accounting hedges | Interest rate contracts
Derivative [Line Items]
Derivatives, notional amount	17,500	20,700
Derivatives, credit risk amount	923	1,557
Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivatives, notional amount	104,434	88,636
Derivatives, credit risk amount	$ 778	$ 303

Condensed Consolidated Financ_3

Condensed Consolidated Financial Statement Details - Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 107,280	$ 103,526
Accumulated depreciation and amortization	(69,465)	(66,760)
Total property, plant and equipment, net	37,815	36,766
Land and buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	19,000	17,952
Machinery, equipment and internal-use software
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	77,841	75,291
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 10,439	$ 10,283

Condensed Consolidated Financ_4

Condensed Consolidated Financial Statement Details - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Mar. 27, 2021	Sep. 26, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Long-term taxes payable	$ 25,162	$ 28,170
Other non-current liabilities	27,791	26,320
Total other non-current liabilities	$ 52,953	$ 54,490

Condensed Consolidated Financ_5

Condensed Consolidated Financial Statement Details - Other Income/(Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest and dividend income	$ 718	$ 1,049	$ 1,465	$ 2,094
Interest expense	(670)	(757)	(1,308)	(1,542)
Other income/(expense), net	460	(10)	396	79
Total other income/(expense), net	$ 508	$ 282	$ 553	$ 631

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) € in Billions, $ in Billions	Aug. 30, 2016EUR (€)Subsidiary	Mar. 27, 2021USD ($)	Mar. 27, 2021EUR (€)
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits		$ 16.9
Gross unrecognized tax benefits that would impact effective tax rate, if recognized		8.3
Gross interest and penalties accrued		1.6
Reasonably possible decrease in gross unrecognized tax benefits over next 12 months		$ 3.1
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		€ 12.9
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 (

Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020	Sep. 26, 2020
Debt Instrument [Line Items]
Commercial paper	$ 5,000		$ 5,000		$ 4,996
Floating- and fixed-rate notes, aggregate principal amount	116,005		116,005		106,078
Interest cost on term debt	657	$ 725	1,300	$ 1,500
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 5,000		$ 5,000		$ 5,000
Commercial paper, general maturity period (less than)			9 months
Commercial paper, weighted-average interest rate	0.06%		0.06%		0.62%
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	$ 121,200		$ 121,200		$ 117,100

Debt - Summary of Cash Flows As

Debt - Summary of Cash Flows Associated with Commercial Paper (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Maturities 90 days or less:
Proceeds from commercial paper, net	$ 2,008	$ 1,377
Maturities greater than 90 days:
Proceeds from commercial paper	1,368	4,797
Repayments of commercial paper	(3,354)	(4,656)
Proceeds from/(Repayments of) commercial paper, net	(1,986)	141
Total proceeds from commercial paper, net	$ 22	$ 1,518

Debt - Summary of Term Debt (De

Debt - Summary of Term Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 27, 2021	Sep. 26, 2020
Debt Instrument [Line Items]
Total term debt	$ 116,005	$ 106,078
Unamortized premium/(discount) and issuance costs, net	(371)	(314)
Hedge accounting fair value adjustments	1,011	1,676
Less: Current portion of term debt	(8,003)	(8,773)
Total non-current portion of term debt	108,642	98,667
2013 – 2020 debt issuances | Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 1,750	$ 2,250
Debt instrument, maturity year (calendar), start	2022
Debt instrument, maturity year (calendar), end	2022
2013 – 2020 debt issuances | Floating-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	0.55%	0.60%
2013 – 2020 debt issuances | Floating-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	0.69%	1.39%
2013 – 2020 debt issuances | Fixed-rate notes
Debt Instrument [Line Items]
Total term debt	$ 100,255	$ 103,828
Debt instrument, maturity year (calendar), start	2021
Debt instrument, maturity year (calendar), end	2060
2013 – 2020 debt issuances | Fixed-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0.00%
Debt instrument, effective interest rate	0.03%	0.03%
2013 – 2020 debt issuances | Fixed-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.65%
Debt instrument, effective interest rate	4.78%	4.78%
2021 debt issuance | Fixed-rate notes
Debt Instrument [Line Items]
Total term debt	$ 14,000	$ 0
Debt instrument, maturity year (calendar), start	2026
Debt instrument, maturity year (calendar), end	2061
Debt instrument, effective interest rate		0.00%
2021 debt issuance | Fixed-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0.70%
Debt instrument, effective interest rate	0.75%
2021 debt issuance | Fixed-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.80%
Debt instrument, effective interest rate	2.81%

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) shares in Millions	6 Months Ended
	Mar. 27, 2021	Apr. 28, 2021
Share Repurchase Program [Line Items]
Amount authorized for repurchase of common stock (up to)	$ 225,000,000,000
Number of shares repurchased (in shares)	347
Amount of share repurchases	$ 43,000,000,000
Share repurchase program, amount utilized	$ 211,600,000,000
Subsequent event
Share Repurchase Program [Line Items]
Stock Repurchase Program, Authorized Amount, Increase		$ 90,000,000,000

Comprehensive Income - Pre-tax

Comprehensive Income - Pre-tax Amounts Reclassified from AOCI into the Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total cost of sales	$ 51,505	$ 35,943	$ 118,616	$ 92,545
Other income/(expense), net	(508)	(282)	(553)	(631)
Total amounts reclassified from AOCI	(28,011)	(13,135)	(61,590)	(39,053)
Reclassifications out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified from AOCI	819	855	425	353
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	915	818	639	329
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	314	34	418	(63)
Total cost of sales	406	12	651	(159)
Other income/(expense), net	193	771	(435)	548
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	2	1	5	3
Reclassifications out of AOCI | Unrealized (gains)/losses on marketable debt securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income/(expense), net	$ (96)	$ 37	$ (214)	$ 24

Comprehensive Income - Change i

Comprehensive Income - Change in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 66,224	$ 89,531	$ 65,339	$ 90,488
Total other comprehensive income/(loss)	(465)	(2,371)	120	(2,341)
Ending balances	69,178	78,425	69,178	78,425
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			(1,375)
Other comprehensive income/(loss) before reclassifications			471
Amounts reclassified from AOCI			0
Tax effect			0
Total other comprehensive income/(loss)			471
Ending balances	(904)		(904)
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			(877)
Other comprehensive income/(loss) before reclassifications			111
Amounts reclassified from AOCI			639
Tax effect			(146)
Total other comprehensive income/(loss)			604
Ending balances	(273)		(273)
Unrealized Gains/Losses on Marketable Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			1,846
Other comprehensive income/(loss) before reclassifications			(1,067)
Amounts reclassified from AOCI			(214)
Tax effect			326
Total other comprehensive income/(loss)			(955)
Ending balances	891		891
Accumulated other comprehensive income/(loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	179	(418)	(406)	(584)
Other comprehensive income/(loss) before reclassifications			(485)
Amounts reclassified from AOCI			425
Tax effect			180
Total other comprehensive income/(loss)	(465)	(2,371)	120	(2,341)
Ending balances	$ (286)	$ (2,789)	$ (286)	$ (2,789)

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Details) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021USD ($)shares	Mar. 28, 2020USD ($)	Mar. 27, 2021USD ($)shares	Mar. 28, 2020USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance under stock plans (in shares) | shares	718		718
Total unrecognized compensation cost related to RSUs and stock options	$ 16,700		$ 16,700
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period			2 years 9 months 18 days
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, and 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	$ 867	$ 558	$ 9,400	$ 4,800

Benefit Plans - Restricted Stoc

Benefit Plans - Restricted Stock Units Activity and Related Information (Details) - Restricted stock units $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Mar. 27, 2021USD ($)$ / sharesshares
Number of Restricted Stock Units
Beginning balance (in shares) | shares	310,778
RSUs granted (in shares) | shares	79,068
RSUs vested (in shares) | shares	(75,295)
RSUs canceled (in shares) | shares	(5,918)
Ending balance (in shares) | shares	308,633
Weighted-Average Grant Date Fair Value Per RSU
Beginning balance (in dollars per share) | $ / shares	$ 51.58
RSUs granted (in dollars per share) | $ / shares	113.39
RSUs vested (in dollars per share) | $ / shares	45.83
RSUs canceled (in dollars per share) | $ / shares	63.67
Ending balance (in dollars per share) | $ / shares	$ 68.58
Aggregate Fair Value
Aggregate fair value of RSUs | $	$ 37,409

Benefit Plans - Summary of Shar

Benefit Plans - Summary of Share-Based Compensation Expense and the Related Income Tax Benefit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Share-based Payment Arrangement [Abstract]
Share-based compensation expense	$ 1,981	$ 1,697	$ 4,001	$ 3,407
Income tax benefit related to share-based compensation expense	$ (575)	$ (444)	$ (2,199)	$ (1,202)

Commitments and Contingencies -

Commitments and Contingencies - Changes in Accrued Warranties and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Changes in Accrued Warranties and Related Costs [Roll Forward]
Beginning accrued warranty and related costs	$ 4,124	$ 3,873	$ 3,354	$ 3,570
Cost of warranty claims	(649)	(689)	(1,372)	(1,604)
Accruals for product warranty	309	739	1,802	1,957
Ending accrued warranty and related costs	$ 3,784	$ 3,923	$ 3,784	$ 3,923

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Details) $ in Millions, € in Billions	Mar. 18, 2021USD ($)	Aug. 11, 2020USD ($)	Mar. 16, 2020EUR (€)	Oct. 31, 2020USD ($)	Mar. 27, 2021USD ($)
Commitments and Contingencies Disclosure [Line Items]
Unconditional purchase obligations					$ 8,200
VirnetX | Pending litigation
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party				$ 503
iOS Performance Management | Litigation, final court approval
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party	$ 310
French Competition Authority | Pending litigation
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party | €			€ 1.1
Optis | Pending litigation
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party		$ 506

Segment Information and Geogr_3

Segment Information and Geographic Data - Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Segment Reporting Information [Line Items]
Net sales	$ 89,584	$ 58,313	$ 201,023	$ 150,132
Operating income	27,503	12,853	61,037	38,422
Americas
Segment Reporting Information [Line Items]
Net sales	34,306	25,473	80,616	66,840
Operating income	12,050	7,261	27,835	20,353
Europe
Segment Reporting Information [Line Items]
Net sales	22,264	14,294	49,570	37,567
Operating income	8,265	4,528	17,854	12,247
Greater China
Segment Reporting Information [Line Items]
Net sales	17,728	9,455	39,041	23,033
Operating income	7,758	3,758	16,288	9,121
Japan
Segment Reporting Information [Line Items]
Net sales	7,742	5,206	16,027	11,429
Operating income	3,428	2,236	6,931	5,014
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	7,544	3,885	15,769	11,263
Operating income	$ 2,736	$ 1,290	$ 5,689	$ 4,021

Segment Information and Geogr_4

Segment Information and Geographic Data - Reconciliation of Segment Operating Income to the Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 27,503	$ 12,853	$ 61,037	$ 38,422
Research and development expense	(5,262)	(4,565)	(10,425)	(9,016)
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	34,237	19,073	74,597	50,756
Segment reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	(5,262)	(4,565)	(10,425)	(9,016)
Corporate non-segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other corporate expenses, net	$ (1,472)	$ (1,655)	$ (3,135)	$ (3,318)