Change in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 27, 2014	Dec. 28, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 1,082
Other comprehensive income/(loss) before reclassifications	1,569
Amounts reclassified from AOCI	(685)	71
Tax effect	(3)us-gaap_OtherComprehensiveIncomeLossTax
Total other comprehensive income/(loss)	881	165
Ending balance	1,963
Cumulative Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(242)
Other comprehensive income/(loss) before reclassifications	(114)
Amounts reclassified from AOCI	0
Tax effect	48
Total other comprehensive income/(loss)	(66)
Ending balance	(308)
Unrecognized Gains/Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,364
Other comprehensive income/(loss) before reclassifications	2,390
Amounts reclassified from AOCI	(663)
Tax effect	(310)
Total other comprehensive income/(loss)	1,417
Ending balance	2,781
Unrealized Gains/Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(40)
Other comprehensive income/(loss) before reclassifications	(707)
Amounts reclassified from AOCI	(22)
Tax effect	259
Total other comprehensive income/(loss)	(470)
Ending balance	$ (510)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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

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

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