CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Statement of Cash Flows [Abstract]
Cash, cash equivalents and restricted cash, beginning balances	$ 50,224	$ 25,913	$ 20,289
Operating activities:
Net income	57,411	55,256	59,531
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	11,056	12,547	10,903
Share-based compensation expense	6,829	6,068	5,340
Deferred income tax benefit	(215)	(340)	(32,590)
Other	(97)	(652)	(444)
Changes in operating assets and liabilities:
Accounts receivable, net	6,917	245	(5,322)
Inventories	(127)	(289)	828
Vendor non-trade receivables	1,553	2,931	(8,010)
Other current and non-current assets	(9,588)	873	(423)
Accounts payable	(4,062)	(1,923)	9,175
Deferred revenue	2,081	(625)	(3)
Other current and non-current liabilities	8,916	(4,700)	38,449
Cash generated by operating activities	80,674	69,391	77,434
Investing activities:
Purchases of marketable securities	(114,938)	(39,630)	(71,356)
Proceeds from maturities of marketable securities	69,918	40,102	55,881
Proceeds from sales of marketable securities	50,473	56,988	47,838
Payments for acquisition of property, plant and equipment	(7,309)	(10,495)	(13,313)
Payments made in connection with business acquisitions, net	(1,524)	(624)	(721)
Purchases of non-marketable securities	(210)	(1,001)	(1,871)
Proceeds from non-marketable securities	92	1,634	353
Other	(791)	(1,078)	(745)
Cash generated by/(used in) investing activities	(4,289)	45,896	16,066
Financing activities:
Proceeds from issuance of common stock	880	781	669
Payments for taxes related to net share settlement of equity awards	(3,634)	(2,817)	(2,527)
Payments for dividends and dividend equivalents	(14,081)	(14,119)	(13,712)
Repurchases of common stock	(72,358)	(66,897)	(72,738)
Proceeds from issuance of term debt, net	16,091	6,963	6,969
Repayments of term debt	(12,629)	(8,805)	(6,500)
Repayments of commercial paper, net	(963)	(5,977)	(37)
Other	(126)	(105)	0
Cash used in financing activities	(86,820)	(90,976)	(87,876)
Increase/(Decrease) in cash, cash equivalents and restricted cash	(10,435)	24,311	5,624
Cash, cash equivalents and restricted cash, ending balances	39,789	50,224	25,913
Supplemental cash flow disclosure:
Cash paid for income taxes, net	9,501	15,263	10,417
Cash paid for interest	$ 3,002	$ 3,423	$ 3,022