Comprehensive Income - Change in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 24, 2016			$ 128,249
Total other comprehensive income/(loss)	$ (123)	$ 941	(1,179)	$ 238
Balance at July 1, 2017	132,425		132,425
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 24, 2016			(578)
Other comprehensive income/(loss) before reclassifications			(38)
Amounts reclassified from AOCI			0
Tax effect			(3)
Total other comprehensive income/(loss)			(41)
Balance at July 1, 2017	(619)		(619)
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 24, 2016			38
Other comprehensive income/(loss) before reclassifications			1,271
Amounts reclassified from AOCI			(1,411)
Tax effect			7
Total other comprehensive income/(loss)			(133)
Balance at July 1, 2017	(95)		(95)
Unrealized Gains/Losses on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 24, 2016			1,174
Other comprehensive income/(loss) before reclassifications			(1,516)
Amounts reclassified from AOCI			(37)
Tax effect			548
Total other comprehensive income/(loss)			(1,005)
Balance at July 1, 2017	169		169
Total AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at September 24, 2016			634
Other comprehensive income/(loss) before reclassifications			(283)
Amounts reclassified from AOCI			(1,448)
Tax effect			552
Total other comprehensive income/(loss)			(1,179)
Balance at July 1, 2017	$ (545)		$ (545)