CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Statement of Cash Flows [Abstract]
Cash, cash equivalents and restricted cash, beginning balances	$ 39,789	$ 50,224	$ 25,913
Operating activities:
Net income	94,680	57,411	55,256
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	11,284	11,056	12,547
Share-based compensation expense	7,906	6,829	6,068
Deferred income tax benefit	(4,774)	(215)	(340)
Other	(147)	(97)	(652)
Changes in operating assets and liabilities:
Accounts receivable, net	(10,125)	6,917	245
Inventories	(2,642)	(127)	(289)
Vendor non-trade receivables	(3,903)	1,553	2,931
Other current and non-current assets	(8,042)	(9,588)	873
Accounts payable	12,326	(4,062)	(1,923)
Deferred revenue	1,676	2,081	(625)
Other current and non-current liabilities	5,799	8,916	(4,700)
Cash generated by operating activities	104,038	80,674	69,391
Investing activities:
Purchases of marketable securities	(109,558)	(114,938)	(39,630)
Proceeds from maturities of marketable securities	59,023	69,918	40,102
Proceeds from sales of marketable securities	47,460	50,473	56,988
Payments for acquisition of property, plant and equipment	(11,085)	(7,309)	(10,495)
Payments made in connection with business acquisitions, net	(33)	(1,524)	(624)
Purchases of non-marketable securities	(131)	(210)	(1,001)
Proceeds from non-marketable securities	387	92	1,634
Other	(608)	(791)	(1,078)
Cash generated by/(used in) investing activities	(14,545)	(4,289)	45,896
Financing activities:
Proceeds from issuance of common stock	1,105	880	781
Payments for taxes related to net share settlement of equity awards	(6,556)	(3,634)	(2,817)
Payments for dividends and dividend equivalents	(14,467)	(14,081)	(14,119)
Repurchases of common stock	(85,971)	(72,358)	(66,897)
Proceeds from issuance of term debt, net	20,393	16,091	6,963
Repayments of term debt	(8,750)	(12,629)	(8,805)
Proceeds from/(Repayments of) commercial paper, net	1,022	(963)	(5,977)
Other	(129)	(126)	(105)
Cash used in financing activities	(93,353)	(86,820)	(90,976)
Increase/(Decrease) in cash, cash equivalents and restricted cash	(3,860)	(10,435)	24,311
Cash, cash equivalents and restricted cash, ending balances	35,929	39,789	50,224
Supplemental cash flow disclosure:
Cash paid for income taxes, net	25,385	9,501	15,263
Cash paid for interest	$ 2,687	$ 3,002	$ 3,423