Change in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (345)
Other comprehensive income/(loss) before reclassifications	(1,226)
Amounts reclassified from AOCI	(438)	$ (685)
Tax effect	529
Total other comprehensive income/(loss)	(1,135)	$ 881
Ending balance	(1,480)
Cumulative Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(653)
Other comprehensive income/(loss) before reclassifications	(121)
Amounts reclassified from AOCI	0
Tax effect	19
Total other comprehensive income/(loss)	(102)
Ending balance	(755)
Unrealized Gains/Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	772
Other comprehensive income/(loss) before reclassifications	325
Amounts reclassified from AOCI	(511)
Tax effect	28
Total other comprehensive income/(loss)	(158)
Ending balance	614
Unrealized Gains/Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(464)
Other comprehensive income/(loss) before reclassifications	(1,430)
Amounts reclassified from AOCI	73
Tax effect	482
Total other comprehensive income/(loss)	(875)
Ending balance	$ (1,339)