CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 20,065	$ 17,891
Other comprehensive income/(loss):
Change in foreign currency translation, net of tax effects of $(1) and $76, respectively	40	(375)
Change in unrealized gains/losses on derivative instruments:
Change in fair value of derivatives, net of tax benefit/(expense) of $(66) and $(228), respectively	88	1,468
Adjustment for net (gains)/losses realized and included in net income, net of tax expense/(benefit) of $(21) and $(211), respectively	102	306
Total change in unrealized gains/losses on derivative instruments, net of tax	190	1,774
Change in unrealized gains/losses on marketable securities:
Change in fair value of marketable securities, net of tax benefit/(expense) of $464 and $989, respectively	(846)	(1,808)
Adjustment for net (gains)/losses realized and included in net income, net of tax expense/(benefit) of $41 and $(11), respectively	(75)	20
Total change in unrealized gains/losses on marketable securities, net of tax	(921)	(1,788)
Total other comprehensive income/(loss)	(691)	(389)
Total comprehensive income	$ 19,374	$ 17,502