Comprehensive Income - Change in Accumulated Other Comprehensive Income by Component (Detail) $ in Millions	9 Months Ended
	Jun. 25, 2016 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 119,355
Other comprehensive income/(loss) before reclassifications	1,886
Amounts reclassified from AOCI	(1,188)
Tax effect	(460)
Total other comprehensive income/(loss)	238
Ending balance	126,541
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(653)
Other comprehensive income/(loss) before reclassifications	62
Amounts reclassified from AOCI	0
Tax effect	2
Total other comprehensive income/(loss)	64
Ending balance	(589)
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	772
Other comprehensive income/(loss) before reclassifications	(56)
Amounts reclassified from AOCI	(1,317)
Tax effect	246
Total other comprehensive income/(loss)	(1,127)
Ending balance	(355)
Unrealized Gains/Losses on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(464)
Other comprehensive income/(loss) before reclassifications	1,880
Amounts reclassified from AOCI	129
Tax effect	(708)
Total other comprehensive income/(loss)	1,301
Ending balance	837
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(345)
Ending balance	$ (107)