CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents, beginning balances	$ 25,913	$ 20,289
Operating activities:
Net income	19,965	20,065
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	3,395	2,745
Share-based compensation expense	1,559	1,296
Deferred income tax expense/(benefit)	53	(33,737)
Other	(54)	(11)
Changes in operating assets and liabilities:
Accounts receivable, net	5,130	(5,570)
Inventories	(1,076)	434
Vendor non-trade receivables	6,905	(9,660)
Other current and non-current assets	(886)	(197)
Accounts payable	(8,501)	12,602
Deferred revenue	(370)	569
Other current and non-current liabilities	570	39,757
Cash generated by operating activities	26,690	28,293
Investing activities:
Purchases of marketable securities	(7,077)	(41,272)
Proceeds from maturities of marketable securities	7,203	14,048
Proceeds from sales of marketable securities	9,723	16,801
Payments for acquisition of property, plant and equipment	(3,355)	(2,810)
Payments made in connection with business acquisitions, net	(167)	(173)
Purchases of non-marketable securities	(427)	(141)
Other	(56)	(43)
Cash generated by/(used in) investing activities	5,844	(13,590)
Financing activities:
Payments for taxes related to net share settlement of equity awards	(1,318)	(1,038)
Payments for dividends and dividend equivalents	(3,568)	(3,339)
Repurchases of common stock	(8,796)	(10,095)
Proceeds from issuance of term debt, net	0	6,969
Change in commercial paper, net	6	2
Cash used in financing activities	(13,676)	(7,501)
Increase/(Decrease) in cash and cash equivalents	18,858	7,202
Cash and cash equivalents, ending balances	44,771	27,491
Supplemental cash flow disclosure:
Cash paid for income taxes, net	4,916	3,551
Cash paid for interest	$ 836	$ 623