CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents, beginning of the period	$ 20,289	$ 20,484
Operating activities:
Net income	45,406	37,637
Adjustments to reconcile net income to cash generated by operating activities:
Depreciation and amortization	8,149	7,673
Share-based compensation expense	3,995	3,666
Deferred income tax expense/(benefit)	(33,109)	4,764
Other	(410)	(142)
Changes in operating assets and liabilities:
Accounts receivable, net	3,756	3,381
Inventories	(1,114)	(1,014)
Vendor non-trade receivables	5,536	3,312
Other current and non-current assets	(65)	(3,229)
Accounts payable	(11,139)	(5,212)
Deferred revenue	(103)	(418)
Other current and non-current liabilities	37,009	(1,942)
Cash generated by operating activities	57,911	48,476
Investing activities:
Purchases of marketable securities	(56,133)	(123,781)
Proceeds from maturities of marketable securities	46,290	19,347
Proceeds from sales of marketable securities	41,614	76,747
Payments for acquisition of property, plant and equipment	(10,272)	(8,586)
Payments made in connection with business acquisitions, net	(431)	(248)
Purchases of non-marketable securities	(1,788)	(213)
Proceeds from non-marketable securities	310	126
Other	(523)	104
Cash generated by/(used in) investing activities	19,067	(36,504)
Financing activities:
Proceeds from issuance of common stock	328	274
Payments for taxes related to net share settlement of equity awards	(2,267)	(1,646)
Payments for dividends and dividend equivalents	(10,182)	(9,499)
Repurchases of common stock	(53,634)	(25,105)
Proceeds from issuance of term debt, net	6,969	21,725
Repayments of term debt	(6,500)	(3,500)
Change in commercial paper, net	(10)	3,866
Cash used in financing activities	(65,296)	(13,885)
Increase/(Decrease) in cash and cash equivalents	11,682	(1,913)
Cash and cash equivalents, end of the period	31,971	18,571
Supplemental cash flow disclosure:
Cash paid for income taxes, net	8,819	9,752
Cash paid for interest	$ 2,120	$ 1,456