CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Cash and cash equivalents, beginning of the period	$ 20,289	$ 20,484
Operating activities:
Net income	20,065	17,891
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	2,745	2,987
Share-based compensation expense	1,296	1,256
Deferred income tax expense/(benefit)	(33,737)	1,452
Other	(11)	(274)
Changes in operating assets and liabilities:
Accounts receivable, net	(5,570)	1,697
Inventories	434	(580)
Vendor non-trade receivables	(9,660)	(375)
Other current and non-current assets	(197)	(1,446)
Accounts payable	14,588	2,460
Deferred revenue	791	42
Other current and non-current liabilities	37,549	2,124
Cash generated by operating activities	28,293	27,234
Investing activities:
Purchases of marketable securities	(41,272)	(54,272)
Proceeds from maturities of marketable securities	14,048	6,525
Proceeds from sales of marketable securities	16,801	32,166
Payments made in connection with business acquisitions, net	(173)	(17)
Payments for acquisition of property, plant and equipment	(2,810)	(3,334)
Payments for acquisition of intangible assets	(154)	(86)
Payments for strategic investments, net	(94)	0
Other	64	(104)
Cash used in investing activities	(13,590)	(19,122)
Financing activities:
Payments for taxes related to net share settlement of equity awards	(1,038)	(629)
Payments for dividends and dividend equivalents	(3,339)	(3,130)
Repurchases of common stock	(10,095)	(10,851)
Proceeds from issuance of term debt, net	6,969	0
Change in commercial paper, net	2	2,385
Cash used in financing activities	(7,501)	(12,225)
Increase/(Decrease) in cash and cash equivalents	7,202	(4,113)
Cash and cash equivalents, end of the period	27,491	16,371
Supplemental cash flow disclosure:
Cash paid for income taxes, net	3,551	3,510
Cash paid for interest	$ 623	$ 497