CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Statement of Cash Flows [Abstract]
Cash, cash equivalents and restricted cash, beginning balances	$ 39,789	$ 50,224
Operating activities:
Net income	28,755	22,236
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	2,666	2,816
Share-based compensation expense	2,020	1,710
Deferred income tax benefit	(58)	(349)
Other	25	(142)
Changes in operating assets and liabilities:
Accounts receivable, net	(10,945)	2,015
Inventories	(950)	(28)
Vendor non-trade receivables	(10,194)	3,902
Other current and non-current assets	(3,526)	(7,054)
Accounts payable	21,670	(1,089)
Deferred revenue	1,341	985
Other current and non-current liabilities	7,959	5,514
Cash generated by operating activities	38,763	30,516
Investing activities:
Purchases of marketable securities	(39,800)	(37,416)
Proceeds from maturities of marketable securities	25,177	19,740
Proceeds from sales of marketable securities	9,344	7,280
Payments for acquisition of property, plant and equipment	(3,500)	(2,107)
Payments made in connection with business acquisitions, net	(9)	(958)
Other	204	(207)
Cash used in investing activities	(8,584)	(13,668)
Financing activities:
Proceeds from issuance of common stock	0	2
Payments for taxes related to net share settlement of equity awards	(2,861)	(1,379)
Payments for dividends and dividend equivalents	(3,613)	(3,539)
Repurchases of common stock	(24,775)	(20,706)
Proceeds from issuance of term debt, net	0	2,210
Repayments of term debt	(1,000)	(1,000)
Proceeds from/(Repayments of) commercial paper, net	22	(979)
Other	(22)	(16)
Cash used in financing activities	(32,249)	(25,407)
Decrease in cash, cash equivalents and restricted cash	(2,070)	(8,559)
Cash, cash equivalents and restricted cash, ending balances	37,719	41,665
Supplemental cash flow disclosure:
Cash paid for income taxes, net	1,787	4,393
Cash paid for interest	$ 619	$ 771