CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 48,351	$ 45,687	$ 53,394
Other comprehensive income/(loss):
Change in foreign currency translation, net of tax effects of $(77), $8 and $201, respectively	224	75	(411)
Change in unrealized gains/losses on derivative instruments:
Change in fair value of derivatives, net of tax benefit/(expense) of $(478), $(7) and $(441), respectively	1,315	7	2,905
Adjustment for net (gains)/losses realized and included in net income, net of tax expense/(benefit) of $475, $131 and $630, respectively	(1,477)	(741)	(3,497)
Total change in unrealized gains/losses on derivative instruments, net of tax	(162)	(734)	(592)
Change in unrealized gains/losses on marketable securities:
Change in fair value of marketable securities, net of tax benefit/(expense) of $425, $(863) and $264, respectively	(782)	1,582	(483)
Adjustment for net (gains)/losses realized and included in net income, net of tax expense/(benefit) of $35, $(31) and $(32), respectively	(64)	56	59
Total change in unrealized gains/losses on marketable securities, net of tax	(846)	1,638	(424)
Total other comprehensive income/(loss)	(784)	979	(1,427)
Total comprehensive income	$ 47,567	$ 46,666	$ 51,967