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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Change in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 1,082
Other comprehensive income/(loss) before reclassifications			3,383
Amounts reclassified from AOCI	(758)	(74)	(1,443)	(3)
Tax effect			(312)us-gaap_OtherComprehensiveIncomeLossTax
Total other comprehensive income/(loss)	747	55	1,628	220
Ending balance	2,710		2,710
Cumulative Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(242)
Other comprehensive income/(loss) before reclassifications			(365)
Amounts reclassified from AOCI			0
Tax effect			119
Total other comprehensive income/(loss)			(246)
Ending balance	(488)		(488)
Unrealized Gains/Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			1,364
Other comprehensive income/(loss) before reclassifications			3,548
Amounts reclassified from AOCI			(1,477)
Tax effect			(356)
Total other comprehensive income/(loss)			1,715
Ending balance	3,079		3,079
Unrealized Gains/Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(40)
Other comprehensive income/(loss) before reclassifications			200
Amounts reclassified from AOCI			34
Tax effect			(75)
Total other comprehensive income/(loss)			159
Ending balance	$ 119		$ 119