CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Statement of Cash Flows [Abstract]
Cash, cash equivalents and restricted cash, beginning balances	$ 50,224	$ 25,913
Operating activities:
Net income	22,236	19,965
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	2,816	3,395
Share-based compensation expense	1,710	1,559
Deferred income tax expense/(benefit)	(349)	53
Other	(142)	(54)
Changes in operating assets and liabilities:
Accounts receivable, net	2,015	5,130
Inventories	(28)	(1,076)
Vendor non-trade receivables	3,902	6,905
Other current and non-current assets	(7,054)	(886)
Accounts payable	(1,089)	(8,501)
Deferred revenue	985	(370)
Other current and non-current liabilities	5,514	570
Cash generated by operating activities	30,516	26,690
Investing activities:
Purchases of marketable securities	(37,416)	(7,077)
Proceeds from maturities of marketable securities	19,740	7,203
Proceeds from sales of marketable securities	7,280	9,723
Payments for acquisition of property, plant and equipment	(2,107)	(3,355)
Payments made in connection with business acquisitions, net	(958)	(167)
Purchases of non-marketable securities	(77)	(427)
Other	(130)	(56)
Cash generated by/(used in) investing activities	(13,668)	5,844
Financing activities:
Proceeds from issuance of common stock	2	0
Payments for taxes related to net share settlement of equity awards	(1,379)	(1,318)
Payments for dividends and dividend equivalents	(3,539)	(3,568)
Repurchases of common stock	(20,706)	(8,796)
Proceeds from issuance of term debt, net	2,210	0
Repayments of term debt	(1,000)	0
Proceeds from/(Repayments of) commercial paper, net	(979)	6
Other	(16)	0
Cash used in financing activities	(25,407)	(13,676)
Increase/(Decrease) in cash, cash equivalents and restricted cash	(8,559)	18,858
Cash, cash equivalents and restricted cash, ending balances	41,665	44,771
Supplemental cash flow disclosure:
Cash paid for income taxes, net	4,393	4,916
Cash paid for interest	$ 771	$ 836