Change in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 26, 2016	Mar. 28, 2015	Mar. 26, 2016	Mar. 28, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (345)
Other comprehensive income/(loss) before reclassifications			233
Amounts reclassified from AOCI	$ (596)	$ (758)	(1,034)	$ (1,443)
Tax effect			98
Total other comprehensive income/(loss)	432	$ 747	(703)	$ 1,628
Ending balance	(1,048)		(1,048)
Cumulative Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(653)
Other comprehensive income/(loss) before reclassifications			18
Amounts reclassified from AOCI			0
Tax effect			0
Total other comprehensive income/(loss)			18
Ending balance	(635)		(635)
Unrealized Gains/Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			772
Other comprehensive income/(loss) before reclassifications			146
Amounts reclassified from AOCI			(1,183)
Tax effect			173
Total other comprehensive income/(loss)			(864)
Ending balance	(92)		(92)
Unrealized Gains/Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(464)
Other comprehensive income/(loss) before reclassifications			69
Amounts reclassified from AOCI			149
Tax effect			(75)
Total other comprehensive income/(loss)			143
Ending balance	$ (321)		$ (321)