Apple (AAPL) 10-Q 1 Aug 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares shares in Thousands	9 Months Ended
	Jun. 30, 2018	Jul. 20, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	AAPL
Entity Registrant Name	APPLE INC
Entity Central Index Key	320,193
Current Fiscal Year End Date	--09-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		4,829,926

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Income Statement [Abstract]
Net sales	$ 53,265	$ 45,408	$ 202,695	$ 176,655
Cost of sales	32,844	27,920	124,940	108,400
Gross margin	20,421	17,488	77,755	68,255
Operating expenses:
Research and development	3,701	2,937	10,486	8,584
Selling, general and administrative	4,108	3,783	12,489	11,447
Total operating expenses	7,809	6,720	22,975	20,031
Operating income	12,612	10,768	54,780	48,224
Other income/(expense), net	672	540	1,702	1,948
Income before provision for income taxes	13,284	11,308	56,482	50,172
Provision for income taxes	1,765	2,591	11,076	12,535
Net income	$ 11,519	$ 8,717	$ 45,406	$ 37,637
Earnings per share:
Basic (in dollars per share)	$ 2.36	$ 1.68	$ 9.07	$ 7.18
Diluted (in dollars per share)	$ 2.34	$ 1.67	$ 8.99	$ 7.14
Shares used in computing earnings per share:
Basic (in shares)	4,882,167	5,195,088	5,006,640	5,239,847
Diluted (in shares)	4,926,609	5,233,499	5,050,963	5,274,394
Cash dividends declared per share (in dollars per share)	$ 0.73	$ 0.63	$ 1.99	$ 1.77

CONDENSED CONSOLIDATED STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 11,519	$ 8,717	$ 45,406	$ 37,637
Other comprehensive income/(loss):
Change in foreign currency translation, net of tax effects of $(3), $(35), $4 and $(3), respectively	(590)	120	(287)	(41)
Change in unrealized gains/losses on derivative instruments:
Change in fair value of derivatives, net of tax benefit/(expense) of $70, $(16), $(60) and $(269), respectively	109	(166)	170	1,002
Adjustment for net (gains)/losses realized and included in net income, net of tax expense/(benefit) of $(254), $176, $(198) and $276, respectively	978	(409)	873	(1,135)
Total change in unrealized gains/losses on derivative instruments, net of tax	1,087	(575)	1,043	(133)
Change in unrealized gains/losses on marketable securities:
Change in fair value of marketable securities, net of tax benefit/(expense) of $154, $(197), $1,159 and $536, respectively	(568)	364	(3,417)	(980)
Adjustment for net (gains)/losses realized and included in net income, net of tax expense/(benefit) of $(7), $16, $27 and $12, respectively	24	(32)	(22)	(25)
Total change in unrealized gains/losses on marketable securities, net of tax	(544)	332	(3,439)	(1,005)
Total other comprehensive income/(loss)	(47)	(123)	(2,683)	(1,179)
Total comprehensive income	$ 11,472	$ 8,594	$ 42,723	$ 36,458

CONDENSED CONSOLIDATED STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Change in foreign currency translation, tax effects	$ (3)	$ (35)	$ 4	$ (3)
Change in fair value of derivatives, tax benefit/(expense)	70	(16)	(60)	(269)
Adjustment for net (gains)/losses realized and included in net income, tax expense/(benefit)	(254)	176	(198)	276
Change in fair value of marketable securities, tax benefit/(expense)	154	(197)	1,159	536
Adjustment for net (gains)/losses realized and included in net income, tax expense/(benefit)	$ (7)	$ 16	$ 27	$ 12

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 31,971	$ 20,289
Short-term marketable securities	38,999	53,892
Accounts receivable, net	14,104	17,874
Inventories	5,936	4,855
Vendor non-trade receivables	12,263	17,799
Other current assets	12,488	13,936
Total current assets	115,761	128,645
Long-term marketable securities	172,773	194,714
Property, plant and equipment, net	38,117	33,783
Other non-current assets	22,546	18,177
Total assets	349,197	375,319
Current liabilities:
Accounts payable	38,489	49,049
Accrued expenses	25,184	25,744
Deferred revenue	7,403	7,548
Commercial paper	11,974	11,977
Current portion of long-term debt	5,498	6,496
Total current liabilities	88,548	100,814
Deferred revenue, non-current	2,878	2,836
Long-term debt	97,128	97,207
Other non-current liabilities	45,694	40,415
Total liabilities	234,248	241,272
Commitments and contingencies
Shareholders’ equity:
Common stock and additional paid-in capital, $0.00001 par value: 12,600,000 shares authorized; 4,842,917 and 5,126,201 shares issued and outstanding, respectively	38,624	35,867
Retained earnings	79,436	98,330
Accumulated other comprehensive income/(loss)	(3,111)	(150)
Total shareholders’ equity	114,949	134,047
Total liabilities and shareholders’ equity	$ 349,197	$ 375,319

CONDENSED CONSOLIDATED BALANCE6

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	12,600,000,000	12,600,000,000
Common stock, shares issued (in shares)	4,842,917,000	5,126,201,000
Common stock, shares outstanding (in shares)	4,842,917,000	5,126,201,000

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents, beginning of the period	$ 20,289	$ 20,484
Operating activities:
Net income	45,406	37,637
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	8,149	7,673
Share-based compensation expense	3,995	3,666
Deferred income tax expense/(benefit)	(33,109)	4,764
Other	(410)	(142)
Changes in operating assets and liabilities:
Accounts receivable, net	3,756	3,381
Inventories	(1,114)	(1,014)
Vendor non-trade receivables	5,536	3,312
Other current and non-current assets	(65)	(3,229)
Accounts payable	(11,139)	(5,212)
Deferred revenue	(103)	(418)
Other current and non-current liabilities	37,009	(1,942)
Cash generated by operating activities	57,911	48,476
Investing activities:
Purchases of marketable securities	(56,133)	(123,781)
Proceeds from maturities of marketable securities	46,290	19,347
Proceeds from sales of marketable securities	41,614	76,747
Payments for acquisition of property, plant and equipment	(10,272)	(8,586)
Payments made in connection with business acquisitions, net	(431)	(248)
Purchases of non-marketable securities	(1,788)	(213)
Proceeds from non-marketable securities	310	126
Other	(523)	104
Cash generated by/(used in) investing activities	19,067	(36,504)
Financing activities:
Proceeds from issuance of common stock	328	274
Payments for taxes related to net share settlement of equity awards	(2,267)	(1,646)
Payments for dividends and dividend equivalents	(10,182)	(9,499)
Repurchases of common stock	(53,634)	(25,105)
Proceeds from issuance of term debt, net	6,969	21,725
Repayments of term debt	(6,500)	(3,500)
Change in commercial paper, net	(10)	3,866
Cash used in financing activities	(65,296)	(13,885)
Increase/(Decrease) in cash and cash equivalents	11,682	(1,913)
Cash and cash equivalents, end of the period	31,971	18,571
Supplemental cash flow disclosure:
Cash paid for income taxes, net	8,819	9,752
Cash paid for interest	$ 2,120	$ 1,456

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Apple Inc. and its wholly-owned subsidiaries (collectively “Apple” or the “Company”) designs, manufactures and markets mobile communication and media devices and personal computers, and sells a variety of related software, services, accessories and third-party digital content and applications. The Company’s products and services include iPhone ® , iPad ® , Mac ® , Apple Watch ® , AirPods ® , Apple TV ® , HomePod™, a portfolio of consumer and professional software applications, iOS, macOS ® , watchOS ® and tvOS™ operating systems, iCloud ® , Apple Pay ® and a variety of other accessory, service and support offerings. The Company sells and delivers digital content and applications through the iTunes Store ® , App Store ® , Mac App Store, TV App Store, iBooks Store ® and Apple Music ® (collectively “Digital Content and Services”). The Company sells its products worldwide through its retail stores, online stores and direct sales force, as well as through third-party cellular network carriers, wholesalers, retailers and resellers. In addition, the Company sells a variety of third-party Apple-compatible products, including application software and various accessories through its retail and online stores. The Company sells to consumers, small and mid-sized businesses and education, enterprise and government customers. Basis of Presentation and Preparation The accompanying condensed consolidated financial statements include the accounts of the Company. Intercompany accounts and transactions have been eliminated. In the opinion of the Company’s management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. The preparation of these condensed consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. Certain prior period amounts in the condensed consolidated financial statements and accompanying notes have been reclassified to conform to the current period’s presentation. These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s annual consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the fiscal year ended September 30, 2017 (the “ 2017 Form 10-K”). The Company’s fiscal year is the 52- or 53-week period that ends on the last Saturday of September. The first quarter of 2018 spanned 13 weeks, whereas a 14th week was added to the first fiscal quarter of 2017, as is done every five or six years, to realign the Company’s fiscal quarters with calendar quarters. 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. Share-Based Compensation During the first quarter of 2018, the Company adopted the Financial Accounting Standards Board’s (the “FASB”) Accounting Standards Update (“ASU”) No. 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”), which modified certain aspects of the accounting for share-based payment transactions, including income taxes, classification of awards and classification in the statement of cash flows. Historically, excess tax benefits or deficiencies from the Company’s equity awards were recorded as additional paid-in capital in its Condensed Consolidated Balance Sheets and were classified as a financing activity in its Condensed Consolidated Statements of Cash Flows. Beginning in 2018, the Company records any excess tax benefits or deficiencies from its equity awards as part of the provision for income taxes in its Condensed Consolidated Statements of Operations in the reporting periods in which equity vesting occurs. The Company elected to apply the cash flow classification requirements related to excess tax benefits retrospectively to all periods presented, which resulted in an increase to cash generated by operating activities in the Condensed Consolidated Statements of Cash Flows of $534 million for the nine months ended July 1, 2017 . Earnings Per Share The following table shows the computation of basic and diluted earnings per share for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (net income in millions and shares in thousands): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Numerator: Net income $ 11,519 $ 8,717 $ 45,406 $ 37,637 Denominator: Weighted-average basic shares outstanding 4,882,167 5,195,088 5,006,640 5,239,847 Effect of dilutive securities 44,442 38,411 44,323 34,547 Weighted-average diluted shares 4,926,609 5,233,499 5,050,963 5,274,394 Basic earnings per share $ 2.36 $ 1.68 $ 9.07 $ 7.18 Diluted earnings per share $ 2.34 $ 1.67 $ 8.99 $ 7.14

Financial Instruments

Financial Instruments	9 Months Ended
	Jun. 30, 2018
Investments, All Other Investments [Abstract]
Financial Instruments	Financial Instruments Cash, Cash Equivalents and Marketable Securities The following tables show the Company’s cash and available-for-sale securities by significant investment category as of June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 Adjusted Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-Term Marketable Securities Long-Term Marketable Securities Cash $ 9,973 $ — $ — $ 9,973 $ 9,973 $ — $ — Level 1 (1) : Money market funds 7,722 — — 7,722 7,722 — — Mutual funds 799 — (112 ) 687 — 687 — Subtotal 8,521 — (112 ) 8,409 7,722 687 — Level 2 (2) : U.S. Treasury securities 47,056 1 (1,055 ) 46,002 350 7,262 38,390 U.S. agency securities 6,994 — (44 ) 6,950 4,477 483 1,990 Non-U.S. government securities 11,774 40 (282 ) 11,532 — 1,124 10,408 Certificates of deposit and time deposits 5,662 — — 5,662 3,649 1,412 601 Commercial paper 7,064 — — 7,064 5,653 1,411 — Corporate securities 130,945 129 (2,246 ) 128,828 147 25,874 102,807 Municipal securities 956 — (8 ) 948 — 172 776 Mortgage- and asset-backed securities 18,919 9 (553 ) 18,375 — 574 17,801 Subtotal 229,370 179 (4,188 ) 225,361 14,276 38,312 172,773 Total (3) $ 247,864 $ 179 $ (4,300 ) $ 243,743 $ 31,971 $ 38,999 $ 172,773 September 30, 2017 Adjusted Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-Term Marketable Securities Long-Term Marketable Securities Cash $ 7,982 $ — $ — $ 7,982 $ 7,982 $ — $ — Level 1 (1) : Money market funds 6,534 — — 6,534 6,534 — — Mutual funds 799 — (88 ) 711 — 711 — Subtotal 7,333 — (88 ) 7,245 6,534 711 — Level 2 (2) : U.S. Treasury securities 55,254 58 (230 ) 55,082 865 17,228 36,989 U.S. agency securities 5,162 2 (9 ) 5,155 1,439 2,057 1,659 Non-U.S. government securities 7,827 210 (37 ) 8,000 9 123 7,868 Certificates of deposit and time deposits 5,832 — — 5,832 1,142 3,918 772 Commercial paper 3,640 — — 3,640 2,146 1,494 — Corporate securities 152,724 969 (242 ) 153,451 172 27,591 125,688 Municipal securities 961 4 (1 ) 964 — 114 850 Mortgage- and asset-backed securities 21,684 35 (175 ) 21,544 — 656 20,888 Subtotal 253,084 1,278 (694 ) 253,668 5,773 53,181 194,714 Total $ 268,399 $ 1,278 $ (782 ) $ 268,895 $ 20,289 $ 53,892 $ 194,714 (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 June 30, 2018 , total cash, cash equivalents and marketable securities included $8.8 billion , related to the State Aid Decision (see Note 4, “Income Taxes”) and other agreements, which was restricted from general use. The Company may sell certain of its marketable securities prior to their stated maturities for strategic reasons including, but not limited to, anticipation of credit deterioration and duration management. The maturities of the Company’s long-term marketable securities generally range from one to five years . The following tables show information about the Company’s marketable securities that had been in a continuous unrealized loss position for less than 12 months and for 12 months or greater as of June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 Continuous Unrealized Losses Less than 12 Months 12 Months or Greater Total Fair value of marketable securities $ 150,468 $ 36,960 $ 187,428 Unrealized losses $ (3,134 ) $ (1,166 ) $ (4,300 ) September 30, 2017 Continuous Unrealized Losses Less than 12 Months 12 Months or Greater Total Fair value of marketable securities $ 101,986 $ 8,290 $ 110,276 Unrealized losses $ (596 ) $ (186 ) $ (782 ) The Company typically invests in highly rated securities, and its investment policy generally limits the amount of credit exposure to any one issuer. The policy generally requires securities to be investment grade, with the primary objective of minimizing the potential risk of principal loss. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, the Company reviews factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates and the Company’s intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s cost basis. As of June 30, 2018 , the Company does not consider any of its investments to be other-than-temporarily impaired. 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, on net investments in certain foreign subsidiaries and on 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 and 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 help 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 and who sell in local currencies 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 help protect the net investment in a foreign operation from adverse changes in foreign currency exchange rates, the Company may enter into foreign currency forward and option contracts to offset 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 economic hedges of its net investments in certain foreign subsidiaries. In both of these cases, the Company designates these instruments as net investment hedges. To help 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 June 30, 2018 , the Company’s hedged term debt– and marketable securities–related foreign currency transactions are expected to be recognized within 24 years . The Company may also enter into non-designated foreign currency contracts to partially offset the foreign currency exchange gains and losses generated by the remeasurement of certain assets and liabilities denominated in non-functional currencies. To help 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 June 30, 2018 , the Company’s hedged interest rate transactions are expected to be recognized within 9 years . Cash Flow Hedges The effective portions of cash flow hedges are recorded in accumulated other comprehensive income/(loss) (“AOCI”) until the hedged item is recognized in earnings. Deferred gains and losses associated with cash flow hedges of foreign currency revenue are recognized as a component of net sales in the same period as the related revenue is recognized, and deferred gains and losses related to cash flow hedges of inventory purchases are recognized as a component of cost of sales in the same period as the related costs are recognized. Deferred gains and losses associated with cash flow hedges of interest income or expense are recognized in other income/(expense), net in the same period as the related income or expense is recognized. The ineffective portions and amounts excluded from the effectiveness testing of cash flow hedges are recognized in other income/(expense), net. Derivative instruments designated as cash flow hedges must be de-designated as hedges when it is probable the forecasted hedged transaction will not occur in the initially identified time period or within a subsequent two-month time period. Deferred gains and losses in AOCI associated with such derivative instruments are reclassified into other income/(expense), net in the period of de-designation. Any subsequent changes in fair value of such derivative instruments are reflected in other income/(expense), net unless they are re-designated as hedges of other transactions. Net Investment Hedges The effective portions of net investment hedges are recorded in other comprehensive income/(loss) (“OCI”) as a part of the cumulative translation adjustment. The ineffective portions and amounts excluded from the effectiveness testing of net investment hedges are recognized in other income/(expense), net. Fair Value Hedges Gains and losses related to changes in fair value hedges are recognized in earnings along with a corresponding loss or gain related to the change in value of the underlying hedged item. Non-Designated Derivatives Derivatives that are not designated as hedging instruments are adjusted to fair value through earnings in the financial statement line item to which the derivative relates. As a result, during the three- and nine-month periods ended June 30, 2018 , respectively, the Company recognized a gain of $135 million and a loss of $7 million in net sales, a gain of $151 million and a loss of $61 million in cost of sales and a gain of $254 million and a loss of $119 million in other income/(expense), net. During the three- and nine-month periods ended July 1, 2017 , respectively, the Company recognized a loss of $77 million and a gain of $129 million in net sales, gains of $12 million and $91 million in cost of sales and gains of $49 million and $481 million in other income/(expense), net. The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. The following tables show the Company’s derivative instruments at gross fair value as of June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 Fair Value of Derivatives Designated as Hedge Instruments Fair Value of Derivatives Not Designated as Hedge Instruments Total Fair Value Derivative assets (1) : Foreign exchange contracts $ 850 $ 385 $ 1,235 Interest rate contracts $ — $ — $ — Derivative liabilities (2) : Foreign exchange contracts $ 357 $ 221 $ 578 Interest rate contracts $ 1,271 $ — $ 1,271 September 30, 2017 Fair Value of Derivatives Designated as Hedge Instruments Fair Value of Derivatives Not Designated as Hedge Instruments Total Fair Value Derivative assets (1) : Foreign exchange contracts $ 1,049 $ 363 $ 1,412 Interest rate contracts $ 218 $ — $ 218 Derivative liabilities (2) : Foreign exchange contracts $ 759 $ 501 $ 1,260 Interest rate contracts $ 303 $ — $ 303 (1) The fair value of derivative assets is measured using Level 2 fair value inputs and is recorded as other current assets and other non-current assets in the Condensed Consolidated Balance Sheets. (2) The fair value of derivative liabilities is measured using Level 2 fair value inputs and is recorded as accrued expenses and other non-current liabilities in the Condensed Consolidated Balance Sheets. The following table shows the pre-tax gains and losses of the Company’s derivative and non-derivative instruments designated as cash flow, net investment and fair value hedges in OCI and the Condensed Consolidated Statements of Operations for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Gains/(Losses) recognized in OCI – effective portion: Cash flow hedges: Foreign exchange contracts $ 40 $ (143 ) $ 230 $ 1,267 Interest rate contracts — (2 ) 1 7 Total $ 40 $ (145 ) $ 231 $ 1,274 Net investment hedges: Foreign currency debt $ 13 $ 16 $ (18 ) $ 53 Gains/(Losses) reclassified from AOCI into net income – effective portion: Cash flow hedges: Foreign exchange contracts $ (1,231 ) $ 585 $ (1,068 ) $ 1,418 Interest rate contracts — — 3 (3 ) Total $ (1,231 ) $ 585 $ (1,065 ) $ 1,415 Gains/(Losses) on derivative instruments: Fair value hedges: Foreign exchange contracts $ 31 $ — $ 31 $ — Interest rate contracts (230 ) 185 (1,178 ) (737 ) Total $ (199 ) $ 185 $ (1,147 ) $ (737 ) Gains/(Losses) related to hedged items: Fair value hedges: Marketable securities $ (31 ) $ — $ (31 ) $ — Fixed-rate debt 230 (185 ) 1,178 737 Total $ 199 $ (185 ) $ 1,147 $ 737 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 June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 September 30, 2017 Notional Amount Credit Risk Amount Notional Amount Credit Risk Amount Instruments designated as accounting hedges: Foreign exchange contracts $ 36,807 $ 850 $ 56,156 $ 1,049 Interest rate contracts $ 33,250 $ — $ 33,000 $ 218 Instruments not designated as accounting hedges: Foreign exchange contracts $ 50,936 $ 385 $ 69,774 $ 363 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 June 30, 2018 , the net cash collateral posted by the Company related to derivative instruments under its collateral security arrangements was $211 million , which was recorded as other current assets in the Condensed Consolidated Balance Sheet. As of September 30, 2017 , the net cash collateral received by the Company related to derivative instruments under its collateral security arrangements was $35 million , which was recorded as accrued expenses in the Condensed Consolidated Balance Sheet. 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 June 30, 2018 and September 30, 2017 , the potential effects of these rights of set-off associated with the Company’s derivative contracts, including the effects of collateral, would be a reduction to both derivative assets and derivative liabilities of $1.5 billion and $1.4 billion , respectively, resulting in a net derivative liability of $403 million and a net derivative asset of $32 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. The Company had no customers that individually represented 10% or more of total trade receivables as of June 30, 2018 . As of September 30, 2017 , the Company had two customers that individually represented 10% or more of total trade receivables, each of which accounted for 10% . The Company’s cellular network carriers accounted for 45% and 59% of total trade receivables as of June 30, 2018 and September 30, 2017 , respectively. Vendor Non-Trade Receivables The Company has non-trade receivables from certain of its manufacturing vendors resulting from the sale of components to these vendors who manufacture sub-assemblies or assemble final products for the Company. The Company purchases these components directly from suppliers. As of June 30, 2018 , the Company had three vendors that individually represented 10% or more of total vendor non-trade receivables, which accounted for 54% , 12% and 11% . As of September 30, 2017 , the Company had three vendors that individually represented 10% or more of total vendor non-trade receivables, which accounted for 42% , 19% and 10% .

Condensed Consolidated Financia

Condensed Consolidated Financial Statement Details	9 Months Ended
	Jun. 30, 2018
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 June 30, 2018 and September 30, 2017 (in millions): Inventories June 30, September 30, Components $ 4,287 $ 3,025 Finished goods 1,649 1,830 Total inventories $ 5,936 $ 4,855 Property, Plant and Equipment, Net June 30, September 30, Land and buildings $ 15,409 $ 13,587 Machinery, equipment and internal-use software 62,060 54,210 Leasehold improvements 7,899 7,279 Gross property, plant and equipment 85,368 75,076 Accumulated depreciation and amortization (47,251 ) (41,293 ) Total property, plant and equipment, net $ 38,117 $ 33,783 Other Non-Current Liabilities June 30, September 30, Long-term taxes payable $ 34,029 $ 257 Deferred tax liabilities 398 31,504 Other non-current liabilities 11,267 8,654 Total other non-current liabilities $ 45,694 $ 40,415 Other Income/(Expense), Net The following table shows the detail of other income/(expense), net for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Interest and dividend income $ 1,418 $ 1,327 $ 4,375 $ 3,833 Interest expense (846 ) (602 ) (2,372 ) (1,657 ) Other income/(expense), net 100 (185 ) (301 ) (228 ) Total other income/(expense), net $ 672 $ 540 $ 1,702 $ 1,948

Income Taxes

Income Taxes	9 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes U.S. Tax Cuts and Jobs Act and Provisional Estimates On December 22, 2017, the U.S. enacted the Tax Cuts and Jobs Act (the “Act”), which significantly changed U.S. tax law. The Act lowered the Company’s U.S. statutory federal income tax rate from 35% to 21% effective January 1, 2018, while also imposing a deemed repatriation tax on previously deferred foreign income. The Act also created a new minimum tax on certain future foreign earnings. During the first quarter of 2018, the Company’s income tax expense included a provisional estimate of $2.6 billion in accordance with the U.S. Securities and Exchange Commission Staff Accounting Bulletin No. 118. This $2.6 billion provisional estimate included $1.8 billion related to the impact of remeasuring the Company’s deferred tax balances to reflect the new lower tax rate, and approximately $800 million associated with the net impact of the deemed repatriation tax. During the third quarter of 2018, the Company reduced its estimate of the deemed repatriation tax by $1.0 billion and adjusted the estimated impact of the deemed repatriation tax on unrecognized tax benefits by $700 million , resulting in the reduction of the Company’s provisional estimate from $2.6 billion to $900 million . The adjustments to the provisional estimate for the deemed repatriation tax and unrecognized tax benefits are discussed below and their impact was included in the Company’s income tax expense during the third quarter of 2018. Deferred Tax Balances As a result of the Act, the Company remeasured certain deferred tax assets and liabilities based on the revised rates at which they are expected to reverse, including items for which the related income tax effects were originally recognized in OCI. In addition, the Company elected to record certain deferred tax assets and liabilities related to the new minimum tax on certain future foreign earnings. The provisional estimate of $1.8 billion noted above incorporates assumptions based upon the best available interpretation of the Act and may change as the Company receives additional clarification and implementation guidance. During the second quarter of 2018, the FASB issued ASU No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). ASU 2018-02 allows an entity to elect to reclassify the income tax effects of the Act on items within AOCI to retained earnings. The Company elected to apply the provision of ASU 2018-02 at the beginning of the second quarter of 2018 with a reclassification of net tax benefits related to cumulative foreign currency translation and unrealized gains/losses on derivative instruments and marketable securities, resulting in a $278 million decrease in AOCI and a corresponding increase in retained earnings in the Condensed Consolidated Balance Sheet. Deemed Repatriation Tax As of September 30, 2017, the Company had a U.S. deferred tax liability of $36.4 billion for deferred foreign income. During the first quarter of 2018 the Company replaced $36.1 billion of its U.S. deferred tax liability with a provisional deemed repatriation tax payable of $38.0 billion , which was based on the Company’s cumulative post-1986 deferred foreign income. The Company’s estimate of the deemed repatriation tax is based, in part, on the amount of cash and other specified assets anticipated to be held by the Company’s foreign subsidiaries as of September 29, 2018. Therefore, the provisional tax payable is subject to change as the asset amounts are finalized. During the third quarter of 2018, the Company reduced its provisional tax payable by $1.0 billion to $37.0 billion due, in part, to revised estimates of the amount of cash and other specified assets anticipated to be held by the Company’s foreign subsidiaries as of September 29, 2018. The Company plans to pay the tax in installments in accordance with the Act. Unrecognized Tax Benefits As of June 30, 2018 , the Company had gross unrecognized tax benefits of $9.4 billion . These gross unrecognized tax benefits have been offset by certain tax deposits and reduced by the estimated impact of the deemed repatriation tax. As of December 30, 2017, the estimated impact of the deemed repatriation tax on unrecognized tax benefits was $1.1 billion . During the third quarter of 2018, the Company increased the estimated impact of the deemed repatriation tax on unrecognized tax benefits by $700 million , resulting in a revised total estimated impact of $1.8 billion . Upon recognition, $7.3 billion of the unrecognized tax benefits would impact the Company’s effective tax rate. The Company had accrued $1.3 billion of gross interest and penalties as of June 30, 2018 . Both the net unrecognized tax benefits and the interest and penalties are classified as other non-current liabilities in the Condensed Consolidated Balance Sheet. The Company is subject to taxation and files income tax returns in the U.S. federal jurisdiction and in many state and foreign jurisdictions. The U.S. Internal Revenue Service concluded its review of the years 2013 through 2015 during the third quarter of 2018. All years prior to 2016 are now closed. The Company is also subject to audits by state, local and foreign tax authorities. In major states and major foreign jurisdictions, the years subsequent to 2003 generally remain open and could be subject to examination by the taxing authorities. The Company believes that an adequate provision has been made for any adjustments that may result from tax examinations. However, the outcome of tax audits cannot be predicted with certainty. If any issues addressed in the Company’s tax audits are resolved in a manner inconsistent with its expectations, the Company could be required to adjust its provision for income taxes in the period such resolution occurs. Although timing of resolution and/or closure of audits is not certain, the Company believes it is reasonably possible that its gross unrecognized tax benefits could decrease (either by payment, release or a combination of both) in the next 12 months by as much as $500 million . European Commission State Aid Decision On August 30, 2016, the European Commission announced its decision that Ireland granted state aid to the Company by providing tax opinions in 1991 and 2007 concerning the tax allocation of profits of the Irish branches of two subsidiaries of the Company (the “State Aid Decision”). The State Aid Decision ordered Ireland to calculate and recover additional taxes from the Company for the period June 2003 through December 2014. The recovery amount was calculated to be €13 billion , plus interest of €1 billion . Irish legislative changes, effective as of January 2015, eliminated the application of the tax opinions from that date forward. The Company believes the State Aid Decision to be without merit and appealed to the General Court of the Court of Justice of the European Union. Ireland has also appealed the State Aid Decision. The Company believes that any incremental Irish corporate income taxes potentially due related to the State Aid Decision would be creditable against U.S. taxes, subject to any foreign tax credit limitations in the Act. During the third quarter of 2018, the Company began funding amounts into escrow, where they will remain pending conclusion of all appeals. As of June 30, 2018 , €4.5 billion of the recovery amount was funded into escrow and was restricted from general use. Refer to Note 2, “Financial Instruments” for more information. Subsequent to June 30, 2018, the Company has funded an additional €4.5 billion of the recovery amount into escrow.

Debt

Debt	9 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Commercial Paper The Company issues unsecured short-term promissory notes (“Commercial Paper”) pursuant to a commercial paper program. The Company uses net proceeds from the commercial paper program for general corporate purposes, including dividends and share repurchases. As of both June 30, 2018 and September 30, 2017 , the Company had $12.0 billion of Commercial Paper outstanding with maturities generally less than nine months . The weighted-average interest rate of the Company’s Commercial Paper was 2.03% as of June 30, 2018 and 1.20% as of September 30, 2017 . The following table provides a summary of cash flows associated with the issuance and maturities of Commercial Paper for the nine months ended June 30, 2018 and July 1, 2017 (in millions): Nine Months Ended June 30, July 1, Maturities 90 days or less: Proceeds from/(Repayments of) commercial paper, net $ 2,619 $ (143 ) Maturities greater than 90 days: Proceeds from commercial paper 9,782 12,633 Repayments of commercial paper (12,411 ) (8,624 ) Proceeds from/(Repayments of) commercial paper, net (2,629 ) 4,009 Total change in commercial paper, net $ (10 ) $ 3,866 Term Debt As of June 30, 2018 , the Company had outstanding floating- and fixed-rate notes with varying maturities for an aggregate principal amount of $104.1 billion (collectively the “Notes”). The Notes are senior unsecured obligations, and interest is payable in arrears, quarterly for the U.S. dollar–denominated and Australian dollar–denominated floating-rate notes, semi-annually for the U.S. dollar–denominated, Australian dollar–denominated, British pound–denominated, Japanese yen–denominated and Canadian dollar–denominated fixed-rate notes and annually for the euro-denominated and Swiss franc–denominated fixed-rate notes. The following table provides a summary of the Company’s term debt as of June 30, 2018 and September 30, 2017 : Maturities June 30, 2018 September 30, 2017 Amount (in millions) Effective Interest Rate Amount (in millions) Effective Interest Rate 2013 debt issuance of $17.0 billion: Floating-rate notes — $ — — % $ 2,000 1.10% 1.10 % Fixed-rate 2.400% – 3.850% notes 2023 – 2043 8,500 2.44% – 3.91 % 12,500 1.08% – 3.91 % 2014 debt issuance of $12.0 billion: Floating-rate notes 2019 2019 1,000 2.66% 2.66 % 1,000 1.61% 1.61 % Fixed-rate 2.100% – 4.450% notes 2019 – 2044 8,500 2.66% – 4.48 % 8,500 1.61% – 4.48 % 2015 debt issuances of $27.3 billion: Floating-rate notes 2019 – 2020 1,517 1.87% – 2.66 % 1,549 1.56% – 1.87 % Fixed-rate 0.350% – 4.375% notes 2019 – 2045 24,395 0.28% – 4.51 % 24,522 0.28% – 4.51 % 2016 debt issuances of $24.9 billion: Floating-rate notes 2019 – 2021 1,350 2.50% – 3.46 % 1,350 1.45% – 2.44 % Fixed-rate 1.100% – 4.650% notes 2019 – 2046 23,079 1.13% – 4.78 % 23,645 1.13% – 4.78 % 2017 debt issuances of $28.7 billion: Floating-rate notes 2019 – 2022 3,250 2.43% – 2.87 % 3,250 1.38% – 1.81 % Fixed-rate 0.875% – 4.300% notes 2019 – 2047 25,533 1.54% – 4.30 % 25,705 1.51% – 4.30 % First quarter 2018 debt issuance of $7.0 billion: Fixed-rate 1.800% notes 2019 1,000 1.83 % — — % Fixed-rate 2.000% notes 2020 1,000 2.03 % — — % Fixed-rate 2.400% notes 2023 750 2.66 % — — % Fixed-rate 2.750% notes 2025 1,500 2.77 % — — % Fixed-rate 3.000% notes 2027 1,500 3.07 % — — % Fixed-rate 3.750% notes 2047 1,250 3.80 % — — % Total term debt 104,124 104,021 Unamortized premium/(discount) and issuance costs, net (227 ) (225 ) Hedge accounting fair value adjustments (1,271 ) (93 ) Less: Current portion of long-term debt (5,498 ) (6,496 ) Total long-term debt $ 97,128 $ 97,207 To manage interest rate risk on certain of its U.S. dollar–denominated fixed- or floating-rate notes, the Company has entered into interest rate swaps to effectively convert the fixed interest rates to floating interest rates or the floating interest rates to fixed interest rates on a portion of these notes. Additionally, to manage foreign currency risk on certain of its foreign currency–denominated notes, the Company has entered into foreign currency swaps to effectively convert these notes to U.S. dollar–denominated notes. A portion of the Company’s Japanese yen–denominated notes is designated as a hedge of the foreign currency exposure of the Company’s net investment in a foreign operation. As of June 30, 2018 and September 30, 2017 , the carrying value of the debt designated as a net investment hedge was $349 million and $1.6 billion , respectively. For further discussion regarding the Company’s use of derivative instruments, see the Derivative Financial Instruments section of Note 2, “Financial Instruments.” The effective interest rates for the Notes include the interest on the Notes, amortization of the discount or premium and, if applicable, adjustments related to hedging. The Company recognized $780 million and $2.2 billion of interest expense on its term debt for the three- and nine-month periods ended June 30, 2018 , respectively. The Company recognized $574 million and $1.6 billion of interest expense on its term debt for the three- and nine-month periods ended July 1, 2017 , respectively. As of June 30, 2018 and September 30, 2017 , the fair value of the Company’s Notes, based on Level 2 inputs, was $103.1 billion and $106.1 billion , respectively.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Share Repurchase Program During the third quarter of 2018, the Company repurchased 112.8 million shares of its common stock for $20.0 billion in connection with two separate share repurchase programs. Of the $20.0 billion , $10.4 billion was repurchased under the Company’s previous share repurchase program of up to $210 billion , thereby completing that program. On May 1, 2018, the Company announced the Board of Directors had authorized a new program to repurchase up to $100 billion of the Company’s common stock. The remaining $9.6 billion repurchased during the third quarter of 2018 was in connection with the new share repurchase program. The Company’s new share repurchase program does not obligate it to acquire any specific number of shares. Under this program, shares may be repurchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

Comprehensive Income

Comprehensive Income	9 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Comprehensive Income	Comprehensive Income Comprehensive income consists of two components, net income and OCI. OCI refers to revenue, expenses, and gains and losses that under GAAP are recorded as an element of shareholders’ equity but are excluded from net income. The Company’s OCI consists of foreign currency translation adjustments from those subsidiaries not using the U.S. dollar as their functional currency, net deferred gains and losses on certain derivative instruments accounted for as cash flow hedges and unrealized gains and losses on marketable securities classified as available-for-sale. The following table shows the pre-tax amounts reclassified from AOCI into the Condensed Consolidated Statements of Operations, and the associated financial statement line item, for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended Comprehensive Income Components Financial Statement Line Item June 30, July 1, June 30, July 1, Unrealized (gains)/losses on derivative instruments: Foreign exchange contracts Net sales $ 162 $ (148 ) $ 433 $ (657 ) Cost of sales 206 (73 ) 200 (630 ) Other income/(expense), net 864 (364 ) 441 (127 ) Interest rate contracts Other income/(expense), net — — (3 ) 3 1,232 (585 ) 1,071 (1,411 ) Unrealized (gains)/losses on marketable securities Other income/(expense), net 31 (48 ) (49 ) (37 ) Total amounts reclassified from AOCI $ 1,263 $ (633 ) $ 1,022 $ (1,448 ) The following table shows the changes in AOCI by component for the nine months ended June 30, 2018 (in millions): Cumulative Foreign Currency Translation Unrealized Gains/Losses on Derivative Instruments Unrealized Gains/Losses on Marketable Securities Total Balances as of September 30, 2017 $ (354 ) $ (124 ) $ 328 $ (150 ) Other comprehensive income/(loss) before reclassifications (291 ) 230 (4,576 ) (4,637 ) Amounts reclassified from AOCI — 1,071 (49 ) 1,022 Tax effect 4 (258 ) 1,186 932 Other comprehensive income/(loss) (287 ) 1,043 (3,439 ) (2,683 ) Cumulative effect of change in accounting principle (1) (176 ) 29 (131 ) (278 ) Balances as of June 30, 2018 $ (817 ) $ 948 $ (3,242 ) $ (3,111 ) (1) Refer to Note 4, “Income Taxes” for more information on the Company’s adoption of ASU 2018-02 at the beginning of the second quarter of 2018.

Benefit Plans

Benefit Plans	9 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Benefit Plans	Benefit Plans Stock Plans The Company had 280.4 million shares reserved for future issuance under its stock plans as of June 30, 2018 . Restricted stock units (“RSUs”) granted generally vest over four years , based on continued employment, and are settled upon vesting in shares of the Company’s common stock on a one -for-one basis. Each share issued with respect to RSUs granted under the Company’s stock plans reduces the number of shares available for grant under the plans by two shares. RSUs canceled and shares withheld to satisfy tax withholding obligations increase the number of shares available for grant under the plans utilizing a factor of two times the number of RSUs canceled or shares withheld. Rule 10b5-1 Trading Plans During the three months ended June 30, 2018 , Section 16 officers Angela Ahrendts, Timothy D. Cook, Chris Kondo, Luca Maestri, Daniel Riccio, Philip Schiller and Jeffrey Williams had equity trading plans in place in accordance with Rule 10b5-1(c)(1) under the Exchange Act. An equity trading plan is a written document that pre-establishes the amounts, prices and dates (or formula for determining the amounts, prices and dates) of future purchases or sales of the Company’s stock, including shares acquired pursuant to the Company’s employee and director equity plans. Restricted Stock Units A summary of the Company’s RSU activity and related information for the nine months ended June 30, 2018 is as follows: Number of RSUs (in thousands) Weighted-Average Grant Date Fair Value Per RSU Aggregate Fair Value (in millions) Balance as of September 30, 2017 97,571 $ 110.33 RSUs granted 43,340 $ 160.79 RSUs vested (41,292 ) $ 111.62 RSUs canceled (4,884 ) $ 126.32 Balance as of June 30, 2018 94,735 $ 132.03 $ 17,536 The fair value as of the respective vesting dates of RSUs was $3.3 billion and $6.9 billion for the three- and nine-month periods ended June 30, 2018 , respectively, and was $2.8 billion and $5.4 billion for the three- and nine-month periods ended July 1, 2017 , respectively. Share-Based Compensation The following table shows a summary of the share-based compensation expense included in the Condensed Consolidated Statements of Operations for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Cost of sales $ 250 $ 216 $ 759 $ 662 Research and development 675 566 1,987 1,730 Selling, general and administrative 426 411 1,249 1,274 Total share-based compensation expense $ 1,351 $ 1,193 $ 3,995 $ 3,666 The income tax benefit related to share-based compensation expense was $528 million and $1.5 billion for the three- and nine-month periods ended June 30, 2018 , respectively, and was $380 million and $1.3 billion for the three- and nine-month periods ended July 1, 2017 , respectively. As of June 30, 2018 , the total unrecognized compensation cost related to outstanding RSUs and stock options was $10.4 billion , which the Company expects to recognize over a weighted-average period of 2.6 years .

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Accrued Warranty and Indemnification The following table shows changes in the Company’s accrued warranties and related costs for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Beginning accrued warranty and related costs $ 4,030 $ 4,735 $ 3,834 $ 3,702 Cost of warranty claims (1,044 ) (932 ) (2,959 ) (3,300 ) Accruals for product warranty 567 496 2,678 3,897 Ending accrued warranty and related costs $ 3,553 $ 4,299 $ 3,553 $ 4,299 Agreements entered into by the Company sometimes include indemnification provisions which may subject the Company to costs and damages in the event of a claim against an indemnified third party. Except as disclosed under the heading “Contingencies” below, in the opinion of management, there was not at least a reasonable possibility the Company may have incurred a material loss, or a material loss in excess of a recorded accrual, with respect to indemnification of third parties. The Company offers an iPhone Upgrade Program, which is available to customers who purchase a qualifying iPhone in the U.S., the U.K. and mainland China. The iPhone Upgrade Program provides customers the right to trade in that iPhone for a specified amount when purchasing a new iPhone, provided certain conditions are met. The Company accounts for the trade-in right as a guarantee liability and recognizes arrangement revenue net of the fair value of such right, with subsequent changes to the guarantee liability recognized within revenue. The Company has entered into indemnification agreements with its directors and executive officers. Under these agreements, the Company has agreed to indemnify such individuals to the fullest extent permitted by law against liabilities that arise by reason of their status as directors or officers of the Company and to advance expenses incurred by such individuals in connection with related legal proceedings. It is not possible to determine the maximum potential amount of payments the Company could be required to make under these agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each claim. While the Company maintains directors and officers liability insurance coverage, such insurance coverage may be insufficient to cover all losses or all types of claims that may arise. Concentrations in the Available Sources of Supply of Materials and Product Although most components essential to the Company’s business are generally available from multiple sources, a few components are currently obtained from single or limited sources. In addition, the Company competes for various components with other participants in the markets for mobile communication and media devices and personal computers. Therefore, many components used by the Company, including those that are available from multiple sources, are at times subject to industry-wide shortage and significant commodity pricing fluctuations that could materially adversely affect the Company’s financial condition and operating results. The Company uses some custom components that are not commonly used by its competitors, and new products introduced by the Company often utilize custom components available from only one source. When a component or product uses new technologies, initial capacity constraints may exist until the suppliers’ yields have matured or manufacturing capacity has increased. If the Company’s supply of components for a new or existing product were delayed or constrained, or if an outsourcing partner delayed shipments of completed products to the Company, the Company’s financial condition and operating results could be materially adversely affected. The Company’s business and financial performance could also be materially adversely affected depending on the time required to obtain sufficient quantities from the original source, or to identify and obtain sufficient quantities from an alternative source. Continued availability of these components at acceptable prices, or at all, may be affected if those suppliers decide to concentrate on the production of common components instead of components customized to meet the Company’s requirements. The Company has entered into agreements for the supply of many components; however, there can be no guarantee that the Company will be able to extend or renew these agreements on similar terms, or at all. Therefore, the Company remains subject to significant risks of supply shortages and price increases that could materially adversely affect its financial condition and operating results. Substantially all of the Company’s hardware products are manufactured by outsourcing partners that are located primarily in Asia, with some Mac computers manufactured in the U.S. and Ireland. A significant concentration of this manufacturing is currently performed by a small number of outsourcing partners, often in single locations. Certain of these outsourcing partners are the sole-sourced suppliers of components and manufacturers for many of the Company’s products. Although the Company works closely with its outsourcing partners on manufacturing schedules, the Company’s operating results could be adversely affected if its outsourcing partners were unable to meet their production commitments. The Company’s manufacturing purchase obligations typically cover its requirements for periods up to 150 days . Other Off–Balance Sheet Commitments Operating Leases The Company leases various equipment and facilities, including retail space, under noncancelable operating lease arrangements. The Company does not currently utilize any other off–balance sheet financing arrangements. As of June 30, 2018 , the Company’s total future minimum lease payments under noncancelable operating leases were $9.6 billion . The Company’s retail store and other facility leases typically have original terms not exceeding 10 years and generally contain multi-year renewal options. Unconditional Purchase Obligations The Company has entered into certain off–balance sheet arrangements which require the future purchase of goods or services (“unconditional purchase obligations”). The Company’s unconditional purchase obligations primarily consist of payments for supplier arrangements, internet and telecommunication services and intellectual property licenses. As of June 30, 2018 , the Company’s total future payments under noncancelable unconditional purchase obligations having a remaining term in excess of one year were $8.5 billion . Contingencies The Company is subject to various legal proceedings and claims that have arisen in the ordinary course of business and that have not been fully adjudicated, as further discussed in Part II, Item 1 of this Form 10-Q under the heading “Legal Proceedings” and in Part II, Item 1A of this Form 10-Q under the heading “Risk Factors.” The outcome of litigation is inherently uncertain. If one or more legal matters were resolved against the Company in a reporting period for amounts in excess of management’s expectations, the Company’s consolidated financial statements for that reporting period could be materially adversely affected. In the opinion of management, there was not at least a reasonable possibility the Company may have incurred a material loss, or a material loss in excess of a recorded accrual, with respect to loss contingencies for asserted legal and other claims, except for the following matters: VirnetX VirnetX, Inc. filed two lawsuits in the U.S. District Court for the Eastern District of Texas (the “Eastern Texas District Court”) against the Company alleging that certain Company products infringe four patents (the “VirnetX Patents”) relating to network communications technology (“VirnetX I” and “VirnetX II”). On September 30, 2016, a jury returned a verdict in VirnetX I against the Company and awarded damages of $302 million , which later increased to $440 million in post-trial proceedings. VirnetX I is currently on appeal at the U.S. Court of Appeals for the Federal Circuit (the “Federal Circuit”). On April 11, 2018, a jury returned a verdict in VirnetX II against the Company and awarded damages of $503 million . VirnetX II is currently in post-trial proceedings and is expected to proceed to appeal thereafter. The Company has challenged the validity of the VirnetX Patents at the U.S. Patent and Trademark Office (the “PTO”). In response, the PTO has declared the VirnetX Patents invalid. VirnetX has appealed, and those appeals are currently pending at the Federal Circuit. The Federal Circuit has consolidated the Company’s appeal of the Eastern Texas District Court VirnetX I verdict and VirnetX’s appeals from the PTO invalidity proceedings. The Company believes it will prevail on the merits. Qualcomm On January 20, 2017, the Company filed a lawsuit against Qualcomm Incorporated and affiliated parties (“Qualcomm”) in the U.S. District Court for the Southern District of California seeking, among other things, to enjoin Qualcomm from requiring the Company to pay royalties at the rate demanded by Qualcomm. As the Company does not believe the demanded royalty it has historically paid contract manufacturers for each applicable device is fair, reasonable and non-discriminatory, and believes it to be invalid and/or overstated in other respects as well, no Qualcomm-related royalty payments have been remitted by the Company to its contract manufacturers since the beginning of the second quarter of 2017. The Company believes it will prevail on the merits of the case and has accrued its best estimate for the ultimate resolution of this matter.

Segment Information and Geograp

Segment Information and Geographic Data	9 Months Ended
	Jun. 30, 2018
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, 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 2017 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 nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Americas: Net sales $ 24,542 $ 20,376 $ 84,576 $ 73,501 Operating income $ 7,496 $ 6,420 $ 26,580 $ 23,582 Europe: Net sales $ 12,138 $ 10,675 $ 47,038 $ 41,929 Operating income $ 3,892 $ 2,984 $ 15,044 $ 12,571 Greater China: Net sales $ 9,551 $ 8,004 $ 40,531 $ 34,963 Operating income $ 3,414 $ 3,002 $ 15,285 $ 13,402 Japan: Net sales $ 3,867 $ 3,624 $ 16,572 $ 13,875 Operating income $ 1,765 $ 1,624 $ 7,193 $ 6,334 Rest of Asia Pacific: Net sales $ 3,167 $ 2,729 $ 13,978 $ 12,387 Operating income $ 1,127 $ 892 $ 4,980 $ 4,430 A reconciliation of the Company’s segment operating income to the Condensed Consolidated Statements of Operations for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 is as follows (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Segment operating income $ 17,694 $ 14,922 $ 69,082 $ 60,319 Research and development expense (3,701 ) (2,937 ) (10,486 ) (8,584 ) Other corporate expenses, net (1,381 ) (1,217 ) (3,816 ) (3,511 ) Total operating income $ 12,612 $ 10,768 $ 54,780 $ 48,224

Summary of Significant Accoun18

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation and Preparation	Basis of Presentation and Preparation The accompanying condensed consolidated financial statements include the accounts of the Company. Intercompany accounts and transactions have been eliminated. In the opinion of the Company’s management, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. The preparation of these condensed consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. Certain prior period amounts in the condensed consolidated financial statements and accompanying notes have been reclassified to conform to the current period’s presentation. These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s annual consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the fiscal year ended September 30, 2017 (the “ 2017 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. The first quarter of 2018 spanned 13 weeks, whereas a 14th week was added to the first fiscal quarter of 2017, as is done every five or six years, to realign the Company’s fiscal quarters with calendar quarters. Unless otherwise stated, references to particular years, quarters, months and periods refer to the Company’s fiscal years ended in September and the associated quarters, months and periods of those fiscal years.
New Accounting Pronouncements	During the first quarter of 2018, the Company adopted the Financial Accounting Standards Board’s (the “FASB”) Accounting Standards Update (“ASU”) No. 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”), which modified certain aspects of the accounting for share-based payment transactions, including income taxes, classification of awards and classification in the statement of cash flows. Historically, excess tax benefits or deficiencies from the Company’s equity awards were recorded as additional paid-in capital in its Condensed Consolidated Balance Sheets and were classified as a financing activity in its Condensed Consolidated Statements of Cash Flows. Beginning in 2018, the Company records any excess tax benefits or deficiencies from its equity awards as part of the provision for income taxes in its Condensed Consolidated Statements of Operations in the reporting periods in which equity vesting occurs. The Company elected to apply the cash flow classification requirements related to excess tax benefits retrospectively to all periods presented, which resulted in an increase to cash generated by operating activities in the Condensed Consolidated Statements of Cash Flows of $534 million for the nine months ended July 1, 2017 . During the second quarter of 2018, the FASB issued ASU No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). ASU 2018-02 allows an entity to elect to reclassify the income tax effects of the Act on items within AOCI to retained earnings. The Company elected to apply the provision of ASU 2018-02 at the beginning of the second quarter of 2018 with a reclassification of net tax benefits related to cumulative foreign currency translation and unrealized gains/losses on derivative instruments and marketable securities, resulting in a $278 million decrease in AOCI and a corresponding increase in retained earnings in the Condensed Consolidated Balance Sheet.
Fair Value Measurements	Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities.
Derivative Financial Instruments	The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. 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, on net investments in certain foreign subsidiaries and on 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 and 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 help 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 and who sell in local currencies 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 help protect the net investment in a foreign operation from adverse changes in foreign currency exchange rates, the Company may enter into foreign currency forward and option contracts to offset 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 economic hedges of its net investments in certain foreign subsidiaries. In both of these cases, the Company designates these instruments as net investment hedges. To help 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 June 30, 2018 , the Company’s hedged term debt– and marketable securities–related foreign currency transactions are expected to be recognized within 24 years . The Company may also enter into non-designated foreign currency contracts to partially offset the foreign currency exchange gains and losses generated by the remeasurement of certain assets and liabilities denominated in non-functional currencies. To help 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 June 30, 2018 , the Company’s hedged interest rate transactions are expected to be recognized within 9 years . Cash Flow Hedges The effective portions of cash flow hedges are recorded in accumulated other comprehensive income/(loss) (“AOCI”) until the hedged item is recognized in earnings. Deferred gains and losses associated with cash flow hedges of foreign currency revenue are recognized as a component of net sales in the same period as the related revenue is recognized, and deferred gains and losses related to cash flow hedges of inventory purchases are recognized as a component of cost of sales in the same period as the related costs are recognized. Deferred gains and losses associated with cash flow hedges of interest income or expense are recognized in other income/(expense), net in the same period as the related income or expense is recognized. The ineffective portions and amounts excluded from the effectiveness testing of cash flow hedges are recognized in other income/(expense), net. Derivative instruments designated as cash flow hedges must be de-designated as hedges when it is probable the forecasted hedged transaction will not occur in the initially identified time period or within a subsequent two-month time period. Deferred gains and losses in AOCI associated with such derivative instruments are reclassified into other income/(expense), net in the period of de-designation. Any subsequent changes in fair value of such derivative instruments are reflected in other income/(expense), net unless they are re-designated as hedges of other transactions. Net Investment Hedges The effective portions of net investment hedges are recorded in other comprehensive income/(loss) (“OCI”) as a part of the cumulative translation adjustment. The ineffective portions and amounts excluded from the effectiveness testing of net investment hedges are recognized in other income/(expense), net. Fair Value Hedges Gains and losses related to changes in fair value hedges are recognized in earnings along with a corresponding loss or gain related to the change in value of the underlying hedged item. Non-Designated Derivatives Derivatives that are not designated as hedging instruments are adjusted to fair value through earnings in the financial statement line item to which the derivative relates.
Segment Reporting	The Company reports segment information based on the “management” approach. The management approach designates the internal reporting used by management for making decisions and assessing performance as the source of the Company’s reportable segments. The Company manages its business primarily on a geographic basis. The Company’s reportable segments consist of the Americas, Europe, Greater China, Japan and Rest of Asia Pacific. Americas includes both North and South America. Europe includes European countries, as well as India, the Middle East and Africa. Greater China includes China, Hong Kong and Taiwan. Rest of Asia Pacific includes Australia and those Asian countries not included in the Company’s other reportable segments. Although the reportable segments provide similar hardware and software products and similar services, each one is managed separately to better align with the location of the Company’s customers and distribution partners and the unique market dynamics of each geographic region. The accounting policies of the various segments are the same as those described in Note 1, “Summary of Significant Accounting Policies” of the Notes to Consolidated Financial Statements in Part II, Item 8 of the 2017 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 Accoun19

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table shows the computation of basic and diluted earnings per share for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (net income in millions and shares in thousands): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Numerator: Net income $ 11,519 $ 8,717 $ 45,406 $ 37,637 Denominator: Weighted-average basic shares outstanding 4,882,167 5,195,088 5,006,640 5,239,847 Effect of dilutive securities 44,442 38,411 44,323 34,547 Weighted-average diluted shares 4,926,609 5,233,499 5,050,963 5,274,394 Basic earnings per share $ 2.36 $ 1.68 $ 9.07 $ 7.18 Diluted earnings per share $ 2.34 $ 1.67 $ 8.99 $ 7.14

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Jun. 30, 2018
Investments, All Other Investments [Abstract]
Cash and Available-for-Sale Securities by Significant Investment Category	The following tables show the Company’s cash and available-for-sale securities by significant investment category as of June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 Adjusted Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-Term Marketable Securities Long-Term Marketable Securities Cash $ 9,973 $ — $ — $ 9,973 $ 9,973 $ — $ — Level 1 (1) : Money market funds 7,722 — — 7,722 7,722 — — Mutual funds 799 — (112 ) 687 — 687 — Subtotal 8,521 — (112 ) 8,409 7,722 687 — Level 2 (2) : U.S. Treasury securities 47,056 1 (1,055 ) 46,002 350 7,262 38,390 U.S. agency securities 6,994 — (44 ) 6,950 4,477 483 1,990 Non-U.S. government securities 11,774 40 (282 ) 11,532 — 1,124 10,408 Certificates of deposit and time deposits 5,662 — — 5,662 3,649 1,412 601 Commercial paper 7,064 — — 7,064 5,653 1,411 — Corporate securities 130,945 129 (2,246 ) 128,828 147 25,874 102,807 Municipal securities 956 — (8 ) 948 — 172 776 Mortgage- and asset-backed securities 18,919 9 (553 ) 18,375 — 574 17,801 Subtotal 229,370 179 (4,188 ) 225,361 14,276 38,312 172,773 Total (3) $ 247,864 $ 179 $ (4,300 ) $ 243,743 $ 31,971 $ 38,999 $ 172,773 September 30, 2017 Adjusted Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-Term Marketable Securities Long-Term Marketable Securities Cash $ 7,982 $ — $ — $ 7,982 $ 7,982 $ — $ — Level 1 (1) : Money market funds 6,534 — — 6,534 6,534 — — Mutual funds 799 — (88 ) 711 — 711 — Subtotal 7,333 — (88 ) 7,245 6,534 711 — Level 2 (2) : U.S. Treasury securities 55,254 58 (230 ) 55,082 865 17,228 36,989 U.S. agency securities 5,162 2 (9 ) 5,155 1,439 2,057 1,659 Non-U.S. government securities 7,827 210 (37 ) 8,000 9 123 7,868 Certificates of deposit and time deposits 5,832 — — 5,832 1,142 3,918 772 Commercial paper 3,640 — — 3,640 2,146 1,494 — Corporate securities 152,724 969 (242 ) 153,451 172 27,591 125,688 Municipal securities 961 4 (1 ) 964 — 114 850 Mortgage- and asset-backed securities 21,684 35 (175 ) 21,544 — 656 20,888 Subtotal 253,084 1,278 (694 ) 253,668 5,773 53,181 194,714 Total $ 268,399 $ 1,278 $ (782 ) $ 268,895 $ 20,289 $ 53,892 $ 194,714 (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 June 30, 2018 , total cash, cash equivalents and marketable securities included $8.8 billion , related to the State Aid Decision (see Note 4, “Income Taxes”) and other agreements, which was restricted from general use.
Marketable Securities in a Continuous Unrealized Loss Position	The following tables show information about the Company’s marketable securities that had been in a continuous unrealized loss position for less than 12 months and for 12 months or greater as of June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 Continuous Unrealized Losses Less than 12 Months 12 Months or Greater Total Fair value of marketable securities $ 150,468 $ 36,960 $ 187,428 Unrealized losses $ (3,134 ) $ (1,166 ) $ (4,300 ) September 30, 2017 Continuous Unrealized Losses Less than 12 Months 12 Months or Greater Total Fair value of marketable securities $ 101,986 $ 8,290 $ 110,276 Unrealized losses $ (596 ) $ (186 ) $ (782 )
Derivative Instruments at Gross Fair Value	The following tables show the Company’s derivative instruments at gross fair value as of June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 Fair Value of Derivatives Designated as Hedge Instruments Fair Value of Derivatives Not Designated as Hedge Instruments Total Fair Value Derivative assets (1) : Foreign exchange contracts $ 850 $ 385 $ 1,235 Interest rate contracts $ — $ — $ — Derivative liabilities (2) : Foreign exchange contracts $ 357 $ 221 $ 578 Interest rate contracts $ 1,271 $ — $ 1,271 September 30, 2017 Fair Value of Derivatives Designated as Hedge Instruments Fair Value of Derivatives Not Designated as Hedge Instruments Total Fair Value Derivative assets (1) : Foreign exchange contracts $ 1,049 $ 363 $ 1,412 Interest rate contracts $ 218 $ — $ 218 Derivative liabilities (2) : Foreign exchange contracts $ 759 $ 501 $ 1,260 Interest rate contracts $ 303 $ — $ 303 (1) The fair value of derivative assets is measured using Level 2 fair value inputs and is recorded as other current assets and other non-current assets in the Condensed Consolidated Balance Sheets. (2) The fair value of derivative liabilities is measured using Level 2 fair value inputs and is recorded as accrued expenses and other non-current liabilities in the Condensed Consolidated Balance Sheets.
Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Cash Flow, Net Investment and Fair Value Hedges	The following table shows the pre-tax gains and losses of the Company’s derivative and non-derivative instruments designated as cash flow, net investment and fair value hedges in OCI and the Condensed Consolidated Statements of Operations for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Gains/(Losses) recognized in OCI – effective portion: Cash flow hedges: Foreign exchange contracts $ 40 $ (143 ) $ 230 $ 1,267 Interest rate contracts — (2 ) 1 7 Total $ 40 $ (145 ) $ 231 $ 1,274 Net investment hedges: Foreign currency debt $ 13 $ 16 $ (18 ) $ 53 Gains/(Losses) reclassified from AOCI into net income – effective portion: Cash flow hedges: Foreign exchange contracts $ (1,231 ) $ 585 $ (1,068 ) $ 1,418 Interest rate contracts — — 3 (3 ) Total $ (1,231 ) $ 585 $ (1,065 ) $ 1,415 Gains/(Losses) on derivative instruments: Fair value hedges: Foreign exchange contracts $ 31 $ — $ 31 $ — Interest rate contracts (230 ) 185 (1,178 ) (737 ) Total $ (199 ) $ 185 $ (1,147 ) $ (737 ) Gains/(Losses) related to hedged items: Fair value hedges: Marketable securities $ (31 ) $ — $ (31 ) $ — Fixed-rate debt 230 (185 ) 1,178 737 Total $ 199 $ (185 ) $ 1,147 $ 737
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 June 30, 2018 and September 30, 2017 (in millions): June 30, 2018 September 30, 2017 Notional Amount Credit Risk Amount Notional Amount Credit Risk Amount Instruments designated as accounting hedges: Foreign exchange contracts $ 36,807 $ 850 $ 56,156 $ 1,049 Interest rate contracts $ 33,250 $ — $ 33,000 $ 218 Instruments not designated as accounting hedges: Foreign exchange contracts $ 50,936 $ 385 $ 69,774 $ 363

Condensed Consolidated Financ21

Condensed Consolidated Financial Statement Details (Tables)	9 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventories	Inventories June 30, September 30, Components $ 4,287 $ 3,025 Finished goods 1,649 1,830 Total inventories $ 5,936 $ 4,855
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net June 30, September 30, Land and buildings $ 15,409 $ 13,587 Machinery, equipment and internal-use software 62,060 54,210 Leasehold improvements 7,899 7,279 Gross property, plant and equipment 85,368 75,076 Accumulated depreciation and amortization (47,251 ) (41,293 ) Total property, plant and equipment, net $ 38,117 $ 33,783
Other Non-Current Liabilities	Other Non-Current Liabilities June 30, September 30, Long-term taxes payable $ 34,029 $ 257 Deferred tax liabilities 398 31,504 Other non-current liabilities 11,267 8,654 Total other non-current liabilities $ 45,694 $ 40,415
Other Income/(Expense), Net	Other Income/(Expense), Net The following table shows the detail of other income/(expense), net for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Interest and dividend income $ 1,418 $ 1,327 $ 4,375 $ 3,833 Interest expense (846 ) (602 ) (2,372 ) (1,657 ) Other income/(expense), net 100 (185 ) (301 ) (228 ) Total other income/(expense), net $ 672 $ 540 $ 1,702 $ 1,948

Debt (Tables)

Debt (Tables)	9 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Summary of Cash Flows Associated with Issuance and Maturities of Commercial Paper	The following table provides a summary of cash flows associated with the issuance and maturities of Commercial Paper for the nine months ended June 30, 2018 and July 1, 2017 (in millions): Nine Months Ended June 30, July 1, Maturities 90 days or less: Proceeds from/(Repayments of) commercial paper, net $ 2,619 $ (143 ) Maturities greater than 90 days: Proceeds from commercial paper 9,782 12,633 Repayments of commercial paper (12,411 ) (8,624 ) Proceeds from/(Repayments of) commercial paper, net (2,629 ) 4,009 Total change in commercial paper, net $ (10 ) $ 3,866
Summary of Term Debt	The following table provides a summary of the Company’s term debt as of June 30, 2018 and September 30, 2017 : Maturities June 30, 2018 September 30, 2017 Amount (in millions) Effective Interest Rate Amount (in millions) Effective Interest Rate 2013 debt issuance of $17.0 billion: Floating-rate notes — $ — — % $ 2,000 1.10% 1.10 % Fixed-rate 2.400% – 3.850% notes 2023 – 2043 8,500 2.44% – 3.91 % 12,500 1.08% – 3.91 % 2014 debt issuance of $12.0 billion: Floating-rate notes 2019 2019 1,000 2.66% 2.66 % 1,000 1.61% 1.61 % Fixed-rate 2.100% – 4.450% notes 2019 – 2044 8,500 2.66% – 4.48 % 8,500 1.61% – 4.48 % 2015 debt issuances of $27.3 billion: Floating-rate notes 2019 – 2020 1,517 1.87% – 2.66 % 1,549 1.56% – 1.87 % Fixed-rate 0.350% – 4.375% notes 2019 – 2045 24,395 0.28% – 4.51 % 24,522 0.28% – 4.51 % 2016 debt issuances of $24.9 billion: Floating-rate notes 2019 – 2021 1,350 2.50% – 3.46 % 1,350 1.45% – 2.44 % Fixed-rate 1.100% – 4.650% notes 2019 – 2046 23,079 1.13% – 4.78 % 23,645 1.13% – 4.78 % 2017 debt issuances of $28.7 billion: Floating-rate notes 2019 – 2022 3,250 2.43% – 2.87 % 3,250 1.38% – 1.81 % Fixed-rate 0.875% – 4.300% notes 2019 – 2047 25,533 1.54% – 4.30 % 25,705 1.51% – 4.30 % First quarter 2018 debt issuance of $7.0 billion: Fixed-rate 1.800% notes 2019 1,000 1.83 % — — % Fixed-rate 2.000% notes 2020 1,000 2.03 % — — % Fixed-rate 2.400% notes 2023 750 2.66 % — — % Fixed-rate 2.750% notes 2025 1,500 2.77 % — — % Fixed-rate 3.000% notes 2027 1,500 3.07 % — — % Fixed-rate 3.750% notes 2047 1,250 3.80 % — — % Total term debt 104,124 104,021 Unamortized premium/(discount) and issuance costs, net (227 ) (225 ) Hedge accounting fair value adjustments (1,271 ) (93 ) Less: Current portion of long-term debt (5,498 ) (6,496 ) Total long-term debt $ 97,128 $ 97,207

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Pre-tax Amounts Reclassified from AOCI into the Condensed Consolidated Statements of Operations	The following table shows the pre-tax amounts reclassified from AOCI into the Condensed Consolidated Statements of Operations, and the associated financial statement line item, for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended Comprehensive Income Components Financial Statement Line Item June 30, July 1, June 30, July 1, Unrealized (gains)/losses on derivative instruments: Foreign exchange contracts Net sales $ 162 $ (148 ) $ 433 $ (657 ) Cost of sales 206 (73 ) 200 (630 ) Other income/(expense), net 864 (364 ) 441 (127 ) Interest rate contracts Other income/(expense), net — — (3 ) 3 1,232 (585 ) 1,071 (1,411 ) Unrealized (gains)/losses on marketable securities Other income/(expense), net 31 (48 ) (49 ) (37 ) Total amounts reclassified from AOCI $ 1,263 $ (633 ) $ 1,022 $ (1,448 )
Changes in AOCI by Component	The following table shows the changes in AOCI by component for the nine months ended June 30, 2018 (in millions): Cumulative Foreign Currency Translation Unrealized Gains/Losses on Derivative Instruments Unrealized Gains/Losses on Marketable Securities Total Balances as of September 30, 2017 $ (354 ) $ (124 ) $ 328 $ (150 ) Other comprehensive income/(loss) before reclassifications (291 ) 230 (4,576 ) (4,637 ) Amounts reclassified from AOCI — 1,071 (49 ) 1,022 Tax effect 4 (258 ) 1,186 932 Other comprehensive income/(loss) (287 ) 1,043 (3,439 ) (2,683 ) Cumulative effect of change in accounting principle (1) (176 ) 29 (131 ) (278 ) Balances as of June 30, 2018 $ (817 ) $ 948 $ (3,242 ) $ (3,111 ) (1) Refer to Note 4, “Income Taxes” for more information on the Company’s adoption of ASU 2018-02 at the beginning of the second quarter of 2018.

Benefit Plans (Tables)

Benefit Plans (Tables)	9 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted Stock Unit Activity	A summary of the Company’s RSU activity and related information for the nine months ended June 30, 2018 is as follows: Number of RSUs (in thousands) Weighted-Average Grant Date Fair Value Per RSU Aggregate Fair Value (in millions) Balance as of September 30, 2017 97,571 $ 110.33 RSUs granted 43,340 $ 160.79 RSUs vested (41,292 ) $ 111.62 RSUs canceled (4,884 ) $ 126.32 Balance as of June 30, 2018 94,735 $ 132.03 $ 17,536
Summary of Share-Based Compensation Expense	The following table shows a summary of the share-based compensation expense included in the Condensed Consolidated Statements of Operations for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Cost of sales $ 250 $ 216 $ 759 $ 662 Research and development 675 566 1,987 1,730 Selling, general and administrative 426 411 1,249 1,274 Total share-based compensation expense $ 1,351 $ 1,193 $ 3,995 $ 3,666

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Changes in Accrued Warranties and Related Costs	The following table shows changes in the Company’s accrued warranties and related costs for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Beginning accrued warranty and related costs $ 4,030 $ 4,735 $ 3,834 $ 3,702 Cost of warranty claims (1,044 ) (932 ) (2,959 ) (3,300 ) Accruals for product warranty 567 496 2,678 3,897 Ending accrued warranty and related costs $ 3,553 $ 4,299 $ 3,553 $ 4,299

Segment Information and Geogr26

Segment Information and Geographic Data (Tables)	9 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Summary Information by Reportable Segment	The following table shows information by reportable segment for the three- and nine-month periods ended June 30, 2018 and July 1, 2017 (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Americas: Net sales $ 24,542 $ 20,376 $ 84,576 $ 73,501 Operating income $ 7,496 $ 6,420 $ 26,580 $ 23,582 Europe: Net sales $ 12,138 $ 10,675 $ 47,038 $ 41,929 Operating income $ 3,892 $ 2,984 $ 15,044 $ 12,571 Greater China: Net sales $ 9,551 $ 8,004 $ 40,531 $ 34,963 Operating income $ 3,414 $ 3,002 $ 15,285 $ 13,402 Japan: Net sales $ 3,867 $ 3,624 $ 16,572 $ 13,875 Operating income $ 1,765 $ 1,624 $ 7,193 $ 6,334 Rest of Asia Pacific: Net sales $ 3,167 $ 2,729 $ 13,978 $ 12,387 Operating income $ 1,127 $ 892 $ 4,980 $ 4,430
Reconciliation of Segment Operating Income to 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 nine-month periods ended June 30, 2018 and July 1, 2017 is as follows (in millions): Three Months Ended Nine Months Ended June 30, July 1, June 30, July 1, Segment operating income $ 17,694 $ 14,922 $ 69,082 $ 60,319 Research and development expense (3,701 ) (2,937 ) (10,486 ) (8,584 ) Other corporate expenses, net (1,381 ) (1,217 ) (3,816 ) (3,511 ) Total operating income $ 12,612 $ 10,768 $ 54,780 $ 48,224

Summary of Significant Accoun27

Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	9 Months Ended
	Jul. 01, 2017USD ($)
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to cash provided by operating activities	$ 534

Summary of Significant Accoun28

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		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Numerator:
Net income	$ 11,519	$ 8,717	$ 45,406	$ 37,637
Denominator:
Weighted-average basic shares outstanding (in shares)	4,882,167	5,195,088	5,006,640	5,239,847
Effect of dilutive securities (in shares)	44,442	38,411	44,323	34,547
Weighted-average diluted shares (in shares)	4,926,609	5,233,499	5,050,963	5,274,394
Basic earnings per share (in dollars per share)	$ 2.36	$ 1.68	$ 9.07	$ 7.18
Diluted earnings per share (in dollars per share)	$ 2.34	$ 1.67	$ 8.99	$ 7.14

Financial Instruments - Cash, C

Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017	Jul. 01, 2017	Sep. 24, 2016
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 247,864	$ 268,399
Unrealized Gains	179	1,278
Unrealized Losses	(4,300)	(782)
Fair Value	243,743	268,895
Cash and Cash Equivalents	31,971	20,289	$ 18,571	$ 20,484
Short-Term Marketable Securities	38,999	53,892
Long-Term Marketable Securities	172,773	194,714
Total cash, cash equivalents and marketable securities that were restricted from general use	8,800
Cash
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	9,973	7,982
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	9,973	7,982
Cash and Cash Equivalents	9,973	7,982
Short-Term Marketable Securities	0	0
Long-Term Marketable Securities	0	0
Level 1
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	8,521	7,333
Unrealized Gains	0	0
Unrealized Losses	(112)	(88)
Fair Value	8,409	7,245
Cash and Cash Equivalents	7,722	6,534
Short-Term Marketable Securities	687	711
Long-Term Marketable Securities	0	0
Level 1 | Money market funds
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	7,722	6,534
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	7,722	6,534
Cash and Cash Equivalents	7,722	6,534
Short-Term Marketable Securities	0	0
Long-Term Marketable Securities	0	0
Level 1 | Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	799	799
Unrealized Gains	0	0
Unrealized Losses	(112)	(88)
Fair Value	687	711
Cash and Cash Equivalents	0	0
Short-Term Marketable Securities	687	711
Long-Term Marketable Securities	0	0
Level 2
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	229,370	253,084
Unrealized Gains	179	1,278
Unrealized Losses	(4,188)	(694)
Fair Value	225,361	253,668
Cash and Cash Equivalents	14,276	5,773
Short-Term Marketable Securities	38,312	53,181
Long-Term Marketable Securities	172,773	194,714
Level 2 | U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	47,056	55,254
Unrealized Gains	1	58
Unrealized Losses	(1,055)	(230)
Fair Value	46,002	55,082
Cash and Cash Equivalents	350	865
Short-Term Marketable Securities	7,262	17,228
Long-Term Marketable Securities	38,390	36,989
Level 2 | U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	6,994	5,162
Unrealized Gains	0	2
Unrealized Losses	(44)	(9)
Fair Value	6,950	5,155
Cash and Cash Equivalents	4,477	1,439
Short-Term Marketable Securities	483	2,057
Long-Term Marketable Securities	1,990	1,659
Level 2 | Non-U.S. government securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	11,774	7,827
Unrealized Gains	40	210
Unrealized Losses	(282)	(37)
Fair Value	11,532	8,000
Cash and Cash Equivalents	0	9
Short-Term Marketable Securities	1,124	123
Long-Term Marketable Securities	10,408	7,868
Level 2 | Certificates of deposit and time deposits
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	5,662	5,832
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	5,662	5,832
Cash and Cash Equivalents	3,649	1,142
Short-Term Marketable Securities	1,412	3,918
Long-Term Marketable Securities	601	772
Level 2 | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	7,064	3,640
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	7,064	3,640
Cash and Cash Equivalents	5,653	2,146
Short-Term Marketable Securities	1,411	1,494
Long-Term Marketable Securities	0	0
Level 2 | Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	130,945	152,724
Unrealized Gains	129	969
Unrealized Losses	(2,246)	(242)
Fair Value	128,828	153,451
Cash and Cash Equivalents	147	172
Short-Term Marketable Securities	25,874	27,591
Long-Term Marketable Securities	102,807	125,688
Level 2 | Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	956	961
Unrealized Gains	0	4
Unrealized Losses	(8)	(1)
Fair Value	948	964
Cash and Cash Equivalents	0	0
Short-Term Marketable Securities	172	114
Long-Term Marketable Securities	776	850
Level 2 | Mortgage- and asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	18,919	21,684
Unrealized Gains	9	35
Unrealized Losses	(553)	(175)
Fair Value	18,375	21,544
Cash and Cash Equivalents	0	0
Short-Term Marketable Securities	574	656
Long-Term Marketable Securities	$ 17,801	$ 20,888

Financial Instruments - Additio

Financial Instruments - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)VendorCustomer	Jul. 01, 2017USD ($)	Jun. 30, 2018USD ($)VendorCustomer	Jul. 01, 2017USD ($)	Sep. 30, 2017USD ($)VendorCustomer
Financial Instruments [Line Items]
Maturities of long-term marketable securities, minimum			1 year
Maturities of long-term marketable securities, maximum			5 years
Hedged interest rate transactions, expected recognition period			9 years
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements	$ 1,500		$ 1,500		$ 1,400
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements	1,500		1,500		1,400
Net derivative assets/(liabilities) after potential reductions under master netting arrangements	$ (403)		$ (403)		$ 32
Trade receivables | Credit concentration risk
Financial Instruments [Line Items]
Number of customers that individually represented 10% or more of total trade receivables | Customer	0		0		2
Trade receivables | Credit concentration risk | Customer one
Financial Instruments [Line Items]
Concentration risk, percentage					10.00%
Trade receivables | Credit concentration risk | Customer two
Financial Instruments [Line Items]
Concentration risk, percentage					10.00%
Trade receivables | Credit concentration risk | Cellular network carriers
Financial Instruments [Line Items]
Concentration risk, percentage			45.00%		59.00%
Non-trade receivables | Credit concentration risk
Financial Instruments [Line Items]
Number of vendors that individually represented 10% or more of total vendor non-trade receivables | Vendor	3		3		3
Non-trade receivables | Credit concentration risk | Vendor one
Financial Instruments [Line Items]
Concentration risk, percentage			54.00%		42.00%
Non-trade receivables | Credit concentration risk | Vendor two
Financial Instruments [Line Items]
Concentration risk, percentage			12.00%		19.00%
Non-trade receivables | Credit concentration risk | Vendor three
Financial Instruments [Line Items]
Concentration risk, percentage			11.00%		10.00%
Other current assets
Financial Instruments [Line Items]
Net cash collateral posted, derivative instruments	$ 211		$ 211
Accrued expenses
Financial Instruments [Line Items]
Net cash collateral received, derivative instruments					$ 35
Derivatives not designated as accounting hedges | Net sales
Financial Instruments [Line Items]
Non-designated derivatives, fair value adjustment gains/(losses)	135	$ (77)	(7)	$ 129
Derivatives not designated as accounting hedges | Cost of sales
Financial Instruments [Line Items]
Non-designated derivatives, fair value adjustment gains/(losses)	151	12	(61)	91
Derivatives not designated as accounting hedges | Other income/(expense), net
Financial Instruments [Line Items]
Non-designated derivatives, fair value adjustment gains/(losses)	$ 254	$ 49	$ (119)	$ 481
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
Financial Instruments [Line Items]
Hedged foreign currency transactions, expected recognition period			24 years

Financial Instruments - Marketa

Financial Instruments - Marketable Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Fair Value of Marketable Securities
Continuous Unrealized Losses, Less than 12 Months	$ 150,468	$ 101,986
Continuous Unrealized Losses, 12 Months or Greater	36,960	8,290
Continuous Unrealized Losses, Total	187,428	110,276
Unrealized Losses
Continuous Unrealized Losses, Less than 12 Months	(3,134)	(596)
Continuous Unrealized Losses, 12 Months or Greater	(1,166)	(186)
Continuous Unrealized Losses, Total	$ (4,300)	$ (782)

Financial Instruments - Derivat

Financial Instruments - Derivative Instruments at Gross Fair Value (Details) - Level 2 - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Other current assets and other non-current assets | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	$ 1,235	$ 1,412
Other current assets and other non-current assets | Interest rate contracts
Derivative assets:
Fair value of derivative assets	0	218
Other current assets and other non-current assets | Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	850	1,049
Other current assets and other non-current assets | Derivatives designated as accounting hedges | Interest rate contracts
Derivative assets:
Fair value of derivative assets	0	218
Other current assets and other non-current assets | Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative assets:
Fair value of derivative assets	385	363
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
Accrued expenses and other non-current liabilities | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	578	1,260
Accrued expenses and other non-current liabilities | Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	1,271	303
Accrued expenses and other non-current liabilities | Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	357	759
Accrued expenses and other non-current liabilities | Derivatives designated as accounting hedges | Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	1,271	303
Accrued expenses and other non-current liabilities | Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative liabilities:
Fair value of derivative liabilities	221	501
Accrued expenses and other non-current liabilities | Derivatives not designated as accounting hedges | Interest rate contracts
Derivative liabilities:
Fair value of derivative liabilities	$ 0	$ 0

Financial Instruments - Pre-Tax

Financial Instruments - Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI - effective portion	$ 40	$ (145)	$ 231	$ 1,274
Gains/(Losses) reclassified from AOCI into net income - effective portion	(1,231)	585	(1,065)	1,415
Cash flow hedges | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI - effective portion	40	(143)	230	1,267
Gains/(Losses) reclassified from AOCI into net income - effective portion	(1,231)	585	(1,068)	1,418
Cash flow hedges | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI - effective portion	0	(2)	1	7
Gains/(Losses) reclassified from AOCI into net income - effective portion	0	0	3	(3)
Net investment hedges | Foreign currency debt
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) recognized in OCI - effective portion	13	16	(18)	53
Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) on derivative instruments	(199)	185	(1,147)	(737)
Gains/(Losses) related to hedged items	199	(185)	1,147	737
Fair value hedges | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) on derivative instruments	31	0	31	0
Gains/(Losses) related to hedged items	(31)	0	(31)	0
Fair value hedges | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) on derivative instruments	(230)	185	(1,178)	(737)
Gains/(Losses) related to hedged items	$ 230	$ (185)	$ 1,178	$ 737

Financial Instruments - Notiona

Financial Instruments - Notional Amounts and Credit Risk Amounts Associated with Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Derivatives designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	$ 36,807	$ 56,156
Derivative, credit risk amount	850	1,049
Derivatives designated as accounting hedges | Interest rate contracts
Derivative [Line Items]
Derivative, notional amount	33,250	33,000
Derivative, credit risk amount	0	218
Derivatives not designated as accounting hedges | Foreign exchange contracts
Derivative [Line Items]
Derivative, notional amount	50,936	69,774
Derivative, credit risk amount	$ 385	$ 363

Condensed Consolidated Financ35

Condensed Consolidated Financial Statement Details - Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components	$ 4,287	$ 3,025
Finished goods	1,649	1,830
Total inventories	$ 5,936	$ 4,855

Condensed Consolidated Financ36

Condensed Consolidated Financial Statement Details - Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 85,368	$ 75,076
Accumulated depreciation and amortization	(47,251)	(41,293)
Total property, plant and equipment, net	38,117	33,783
Land and buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	15,409	13,587
Machinery, equipment and internal-use software
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	62,060	54,210
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 7,899	$ 7,279

Condensed Consolidated Financ37

Condensed Consolidated Financial Statement Details - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Long-term taxes payable	$ 34,029	$ 257
Deferred tax liabilities	398	31,504
Other non-current liabilities	11,267	8,654
Total other non-current liabilities	$ 45,694	$ 40,415

Condensed Consolidated Financ38

Condensed Consolidated Financial Statement Details - Other Income/(Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest and dividend income	$ 1,418	$ 1,327	$ 4,375	$ 3,833
Interest expense	(846)	(602)	(2,372)	(1,657)
Other income/(expense), net	100	(185)	(301)	(228)
Total other income/(expense), net	$ 672	$ 540	$ 1,702	$ 1,948

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) $ in Millions, € in Billions	Jan. 01, 2018	Dec. 31, 2017	Aug. 30, 2016EUR (€)Subsidiary	Aug. 01, 2018EUR (€)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jul. 01, 2017USD ($)	Jun. 30, 2018EUR (€)	Sep. 30, 2017USD ($)
Income Tax Contingency [Line Items]
U.S. statutory federal income tax rate	21.00%	35.00%
Provision for income taxes related to the Act, provisional amount							$ 2,600	$ 900
Provision for income taxes related to remeasurement of deferred tax balances, provisional amount							1,800
Provision for income taxes related to deemed repatriation tax, provisional amount							800
Provision for income taxes related to the Act, provisional amount, measurement period reduction					$ 1,000
Increase/(Reduction) to unrecognized tax benefits related to deemed repatriation tax					(700)		(1,100)	(1,800)
Deferred tax liability for unremitted foreign earnings											$ 36,400
Deferred tax liability reversal								33,109	$ (4,764)
Deemed repatriation tax payable, provisional amount					37,000		38,000	37,000
Gross unrecognized tax benefits					9,400			9,400
Unrecognized tax benefits that would impact effective tax rate, if recognized					7,300			7,300
Unrecognized tax benefits, gross interest and penalties accrued					1,300			1,300
Reasonably possible decrease in gross unrecognized tax benefits over next 12 months					500			500
Recovery amount funded into escrow and restricted from general use related to the State Aid Decision					$ 8,800			8,800
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
Recovery amount funded into escrow and restricted from general use related to the State Aid Decision | €										€ 4.5
Unfavorable investigation outcome, EU State Aid rules - interest component
Income Tax Contingency [Line Items]
Maximum potential loss related to European Commission tax ruling | €			€ 1
Subsequent event | Unfavorable investigation outcome, EU State Aid rules
Income Tax Contingency [Line Items]
Recovery amount funded into escrow and restricted from general use related to the State Aid Decision, subsequent to June 30, 2018 | €				€ 4.5
Tax Cuts and Jobs Act, deemed repatriation tax, related amount
Income Tax Contingency [Line Items]
Deferred tax liability reversal							$ 36,100
Accumulated other comprehensive income/(loss)
Income Tax Contingency [Line Items]
Reclassification from AOCI to retained earnings, tax effects of the Act								$ (278)
Accounting Standards Update 2018-02 | Accumulated other comprehensive income/(loss)
Income Tax Contingency [Line Items]
Reclassification from AOCI to retained earnings, tax effects of the Act						$ (278)
Accounting Standards Update 2018-02 | Retained earnings
Income Tax Contingency [Line Items]
Reclassification from AOCI to retained earnings, tax effects of the Act						$ 278

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Commercial paper	$ 11,974		$ 11,974		$ 11,977
Commercial paper, general maturity period (less than)			9 months
Commercial paper, weighted-average interest rate	2.03%		2.03%		1.20%
Floating- and fixed-rate notes, aggregate principal amount	$ 104,124		$ 104,124		$ 104,021
Interest expense on term debt	780	$ 574	2,200	$ 1,600
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	103,100		103,100		106,100
Net investment hedges
Debt Instrument [Line Items]
Carrying value of debt designated as a net investment hedge	$ 349		$ 349		$ 1,600

Debt - Summary of Cash Flows As

Debt - Summary of Cash Flows Associated with Commercial Paper (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Maturities 90 days or less:
Proceeds from/(Repayments of) commercial paper, net	$ 2,619	$ (143)
Maturities greater than 90 days:
Proceeds from commercial paper	9,782	12,633
Repayments of commercial paper	(12,411)	(8,624)
Proceeds from/(Repayments of) commercial paper, net	(2,629)	4,009
Total change in commercial paper, net	$ (10)	$ 3,866

Debt - Summary of Term Debt (De

Debt - Summary of Term Debt (Details) - USD ($)	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Total term debt	$ 104,124,000,000	$ 104,021,000,000
Unamortized premium/(discount) and issuance costs, net	(227,000,000)	(225,000,000)
Hedge accounting fair value adjustments	(1,271,000,000)	(93,000,000)
Less: Current portion of long-term debt	(5,498,000,000)	(6,496,000,000)
Total long-term debt	97,128,000,000	97,207,000,000
2013 debt issuance of $17.0 billion
Debt Instrument [Line Items]
Debt instrument, face amount	17,000,000,000
2013 debt issuance of $17.0 billion | Floating-rate notes
Debt Instrument [Line Items]
Total term debt	0	$ 2,000,000,000
2013 debt issuance of $17.0 billion | Floating-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate		1.10%
2013 debt issuance of $17.0 billion | Floating-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate		1.10%
2013 debt issuance of $17.0 billion | Fixed-rate 2.400% – 3.850% notes
Debt Instrument [Line Items]
Total term debt	$ 8,500,000,000	$ 12,500,000,000
Debt instrument, maturity year, start	2,023
Debt instrument, maturity year, end	2,043
2013 debt issuance of $17.0 billion | Fixed-rate 2.400% – 3.850% notes | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.40%
Debt instrument, effective interest rate	2.44%	1.08%
2013 debt issuance of $17.0 billion | Fixed-rate 2.400% – 3.850% notes | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.85%
Debt instrument, effective interest rate	3.91%	3.91%
2014 debt issuance of $12.0 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 12,000,000,000
2014 debt issuance of $12.0 billion | Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 1,000,000,000	$ 1,000,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,019
2014 debt issuance of $12.0 billion | Floating-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.66%	1.61%
2014 debt issuance of $12.0 billion | Floating-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.66%	1.61%
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes
Debt Instrument [Line Items]
Total term debt	$ 8,500,000,000	$ 8,500,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,044
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.10%
Debt instrument, effective interest rate	2.66%	1.61%
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.45%
Debt instrument, effective interest rate	4.48%	4.48%
2015 debt issuances of $27.3 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 27,300,000,000
2015 debt issuances of $27.3 billion | Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 1,517,000,000	$ 1,549,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,020
2015 debt issuances of $27.3 billion | Floating-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	1.87%	1.56%
2015 debt issuances of $27.3 billion | Floating-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.66%	1.87%
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes
Debt Instrument [Line Items]
Total term debt	$ 24,395,000,000	$ 24,522,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,045
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0.35%
Debt instrument, effective interest rate	0.28%	0.28%
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.375%
Debt instrument, effective interest rate	4.51%	4.51%
2016 debt issuances of $24.9 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 24,900,000,000
2016 debt issuances of $24.9 billion | Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 1,350,000,000	$ 1,350,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,021
2016 debt issuances of $24.9 billion | Floating-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.50%	1.45%
2016 debt issuances of $24.9 billion | Floating-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	3.46%	2.44%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes
Debt Instrument [Line Items]
Total term debt	$ 23,079,000,000	$ 23,645,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,046
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	1.10%
Debt instrument, effective interest rate	1.13%	1.13%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.65%
Debt instrument, effective interest rate	4.78%	4.78%
2017 debt issuances of $28.7 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 28,700,000,000
2017 debt issuances of $28.7 billion | Floating-rate notes
Debt Instrument [Line Items]
Total term debt	$ 3,250,000,000	$ 3,250,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,022
2017 debt issuances of $28.7 billion | Floating-rate notes | Minimum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.43%	1.38%
2017 debt issuances of $28.7 billion | Floating-rate notes | Maximum
Debt Instrument [Line Items]
Debt instrument, effective interest rate	2.87%	1.81%
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes
Debt Instrument [Line Items]
Total term debt	$ 25,533,000,000	$ 25,705,000,000
Debt instrument, maturity year, start	2,019
Debt instrument, maturity year, end	2,047
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0.875%
Debt instrument, effective interest rate	1.54%	1.51%
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes | Maximum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.30%
Debt instrument, effective interest rate	4.30%	4.30%
First quarter 2018 debt issuance of $7.0 billion
Debt Instrument [Line Items]
Debt instrument, face amount	$ 7,000,000,000
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 1.800% notes
Debt Instrument [Line Items]
Total term debt	$ 1,000,000,000	$ 0
Debt instrument, maturity year	2,019
Debt instrument, stated interest rate	1.80%
Debt instrument, effective interest rate	1.83%	0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.000% notes
Debt Instrument [Line Items]
Total term debt	$ 1,000,000,000	$ 0
Debt instrument, maturity year	2,020
Debt instrument, stated interest rate	2.00%
Debt instrument, effective interest rate	2.03%	0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.400% notes
Debt Instrument [Line Items]
Total term debt	$ 750,000,000	$ 0
Debt instrument, maturity year	2,023
Debt instrument, stated interest rate	2.40%
Debt instrument, effective interest rate	2.66%	0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.750% notes
Debt Instrument [Line Items]
Total term debt	$ 1,500,000,000	$ 0
Debt instrument, maturity year	2,025
Debt instrument, stated interest rate	2.75%
Debt instrument, effective interest rate	2.77%	0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 3.000% notes
Debt Instrument [Line Items]
Total term debt	$ 1,500,000,000	$ 0
Debt instrument, maturity year	2,027
Debt instrument, stated interest rate	3.00%
Debt instrument, effective interest rate	3.07%	0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 3.750% notes
Debt Instrument [Line Items]
Total term debt	$ 1,250,000,000	$ 0
Debt instrument, maturity year	2,047
Debt instrument, stated interest rate	3.75%
Debt instrument, effective interest rate	3.80%	0.00%

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) shares in Millions	3 Months Ended
	Jun. 30, 2018	May 01, 2018	Apr. 30, 2018
Share Repurchase Program [Line Items]
Number of shares repurchased (in shares)	112.8
Amount of share repurchases	$ 20,000,000,000
$100 billion share repurchase program announced on May 1, 2018
Share Repurchase Program [Line Items]
Maximum amount authorized for repurchase of common stock		$ 100,000,000,000
Amount of share repurchases	9,600,000,000
$210 billion previous share repurchase program
Share Repurchase Program [Line Items]
Maximum amount authorized for repurchase of common stock			$ 210,000,000,000
Amount of share repurchases	$ 10,400,000,000

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		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales	$ (53,265)	$ (45,408)	$ (202,695)	$ (176,655)
Cost of sales	32,844	27,920	124,940	108,400
Other income/(expense), net	(672)	(540)	(1,702)	(1,948)
Total amounts reclassified from AOCI	(13,284)	(11,308)	(56,482)	(50,172)
Reclassifications out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified from AOCI	1,263	(633)	1,022	(1,448)
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	1,232	(585)	1,071	(1,411)
Reclassifications out of AOCI | Unrealized (gains)/losses on derivative instruments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales	162	(148)	433	(657)
Cost of sales	206	(73)	200	(630)
Other income/(expense), net	864	(364)	441	(127)
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	0	0	(3)	3
Reclassifications out of AOCI | Unrealized (gains)/losses on marketable securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income/(expense), net	$ 31	$ (48)	$ (49)	$ (37)

Comprehensive Income - Change i

Comprehensive Income - Change in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances as of September 30, 2017			$ 134,047
Total other comprehensive income/(loss)	$ (47)	$ (123)	(2,683)	$ (1,179)
Balances as of June 30, 2018	114,949		114,949
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances as of September 30, 2017			(354)
Other comprehensive income/(loss) before reclassifications			(291)
Amounts reclassified from AOCI			0
Tax effect			4
Total other comprehensive income/(loss)			(287)
Cumulative effect of change in accounting principle			(176)
Balances as of June 30, 2018	(817)		(817)
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances as of September 30, 2017			(124)
Other comprehensive income/(loss) before reclassifications			230
Amounts reclassified from AOCI			1,071
Tax effect			(258)
Total other comprehensive income/(loss)			1,043
Cumulative effect of change in accounting principle			29
Balances as of June 30, 2018	948		948
Unrealized Gains/Losses on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances as of September 30, 2017			328
Other comprehensive income/(loss) before reclassifications			(4,576)
Amounts reclassified from AOCI			(49)
Tax effect			1,186
Total other comprehensive income/(loss)			(3,439)
Cumulative effect of change in accounting principle			(131)
Balances as of June 30, 2018	(3,242)		(3,242)
Total AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances as of September 30, 2017			(150)
Other comprehensive income/(loss) before reclassifications			(4,637)
Amounts reclassified from AOCI			1,022
Tax effect			932
Total other comprehensive income/(loss)			(2,683)
Cumulative effect of change in accounting principle			(278)
Balances as of June 30, 2018	$ (3,111)		$ (3,111)

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018USD ($)shares	Jul. 01, 2017USD ($)	Jun. 30, 2018USD ($)shares	Jul. 01, 2017USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance under stock plans (in shares) | shares	280,400,000		280,400,000
Income tax benefit related to share-based compensation expense	$ 528	$ 380	$ 1,500	$ 1,300
Total unrecognized compensation cost related to RSUs and stock options	10,400		$ 10,400
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period			2 years 7 months
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted, vesting period			4 years
Number of shares of common stock issued per RSU upon vesting			1
Reduction in number of shares available for grant per share issued with respect to RSUs granted (in shares) | shares			2
Factor by which each RSU canceled or share withheld for taxes increases the number of shares available for grant			2
Fair value of vested RSUs as of vesting date	$ 3,300	$ 2,800	$ 6,900	$ 5,400

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	9 Months Ended
	Jun. 30, 2018USD ($)$ / sharesshares
Number of Restricted Stock Units
Beginning balance (in shares) | shares	97,571
RSUs granted (in shares) | shares	43,340
RSUs vested (in shares) | shares	(41,292)
RSUs canceled (in shares) | shares	(4,884)
Ending balance (in shares) | shares	94,735
Weighted-Average Grant Date Fair Value Per RSU
Beginning balance (in dollars per share) | $ / shares	$ 110.33
RSUs granted (in dollars per share) | $ / shares	160.79
RSUs vested (in dollars per share) | $ / shares	111.62
RSUs canceled (in dollars per share) | $ / shares	126.32
Ending balance (in dollars per share) | $ / shares	$ 132.03
Aggregate Fair Value
Aggregate fair value of restricted stock units | $	$ 17,536

Benefit Plans - Summary of Shar

Benefit Plans - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 1,351	$ 1,193	$ 3,995	$ 3,666
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	250	216	759	662
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	675	566	1,987	1,730
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 426	$ 411	$ 1,249	$ 1,274

Commitments and Contingencies -

Commitments and Contingencies - Changes in Accrued Warranties and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Changes in Accrued Warranties and Related Costs [Roll Forward]
Beginning accrued warranty and related costs	$ 4,030	$ 4,735	$ 3,834	$ 3,702
Cost of warranty claims	(1,044)	(932)	(2,959)	(3,300)
Accruals for product warranty	567	496	2,678	3,897
Ending accrued warranty and related costs	$ 3,553	$ 4,299	$ 3,553	$ 4,299

Commitments and Contingencies50

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Apr. 11, 2018	Sep. 30, 2016	Jun. 30, 2018
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments, period (up to)			150 days
Total future minimum lease payments under noncancelable operating leases			$ 9,600
Typical term of leases (not exceeding)			10 years
Unconditional purchase obligations			$ 8,500
VirnetX I | Pending litigation
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party		$ 302
Award from legal proceeding, due to other party, revised amount, determined in subsequent proceedings		$ 440
VirnetX II | Pending litigation
Commitments and Contingencies Disclosure [Line Items]
Award from legal proceeding, due to other party	$ 503

Segment Information and Geogr51

Segment Information and Geographic Data - Summary Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Segment Reporting Information [Line Items]
Net sales	$ 53,265	$ 45,408	$ 202,695	$ 176,655
Operating income	12,612	10,768	54,780	48,224
Americas
Segment Reporting Information [Line Items]
Net sales	24,542	20,376	84,576	73,501
Operating income	7,496	6,420	26,580	23,582
Europe
Segment Reporting Information [Line Items]
Net sales	12,138	10,675	47,038	41,929
Operating income	3,892	2,984	15,044	12,571
Greater China
Segment Reporting Information [Line Items]
Net sales	9,551	8,004	40,531	34,963
Operating income	3,414	3,002	15,285	13,402
Japan
Segment Reporting Information [Line Items]
Net sales	3,867	3,624	16,572	13,875
Operating income	1,765	1,624	7,193	6,334
Rest of Asia Pacific
Segment Reporting Information [Line Items]
Net sales	3,167	2,729	13,978	12,387
Operating income	$ 1,127	$ 892	$ 4,980	$ 4,430

Segment Information and Geogr52

Segment Information and Geographic Data - Reconciliation of Segment Operating Income to Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 12,612	$ 10,768	$ 54,780	$ 48,224
Research and development expense	(3,701)	(2,937)	(10,486)	(8,584)
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	17,694	14,922	69,082	60,319
Segment reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expense	(3,701)	(2,937)	(10,486)	(8,584)
Corporate non-segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other corporate expenses, net	$ (1,381)	$ (1,217)	$ (3,816)	$ (3,511)