CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Statement of Cash Flows [Abstract]
Cash, cash equivalents and restricted cash, beginning balances	$ 50,224	$ 25,913
Operating activities:
Net income	33,485	31,526
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	5,602	6,435
Share-based compensation expense	3,407	3,073
Deferred income tax benefit	(651)	(124)
Other	(259)	(215)
Changes in operating assets and liabilities:
Accounts receivable, net	7,284	8,094
Inventories	699	(1,006)
Vendor non-trade receivables	7,923	14,616
Other current and non-current assets	(8,866)	(717)
Accounts payable	(13,520)	(20,024)
Deferred revenue	1,223	(540)
Other current and non-current liabilities	7,500	(3,273)
Cash generated by operating activities	43,827	37,845
Investing activities:
Purchases of marketable securities	(66,489)	(13,854)
Proceeds from maturities of marketable securities	39,738	16,880
Proceeds from sales of marketable securities	27,762	22,635
Payments for acquisition of property, plant and equipment	(3,960)	(5,718)
Payments made in connection with business acquisitions, net	(1,134)	(291)
Purchases of non-marketable securities	(146)	(490)
Other	(426)	30
Cash generated by/(used in) investing activities	(4,655)	19,192
Financing activities:
Proceeds from issuance of common stock	430	390
Payments for taxes related to net share settlement of equity awards	(1,566)	(1,427)
Payments for dividends and dividend equivalents	(6,914)	(7,011)
Repurchases of common stock	(39,280)	(32,498)
Proceeds from issuance of term debt, net	2,210	0
Repayments of term debt	(5,250)	(2,500)
Proceeds from/(Repayments of) commercial paper, net	1,518	(36)
Proceeds from repurchase agreement	2,556	0
Other	(51)	(51)
Cash used in financing activities	(46,347)	(43,133)
Increase/(Decrease) in cash, cash equivalents and restricted cash	(7,175)	13,904
Cash, cash equivalents and restricted cash, ending balances	43,049	39,817
Supplemental cash flow disclosure:
Cash paid for income taxes, net	7,505	9,497
Cash paid for interest	$ 1,689	$ 1,762