Other Comprehensive Income (Loss), Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Total	$ 645		$ 645		$ 666
Other comprehensive income (loss) before reclassifications			(179)
Amounts reclassified out of accumulated other comprehensive income (loss)			211
Tax effects			(53)
Other comprehensive income (loss)	577	$ (36)	(21)	$ (123)
Unrealized holding gains (losses) on available-for-sale investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gains (Losses) On Available-for-Sale Investments	2,545		2,545		2,459
Other comprehensive income (loss) before reclassifications			207
Amounts reclassified out of accumulated other comprehensive income (loss)			(74)
Tax effects			(47)
Other comprehensive income (loss)			86
Deferred tax asset valuation allowance [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Deferred Tax Asset Valuation Allowance	18		18		26
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified out of accumulated other comprehensive income (loss)			0
Tax effects			(8)
Other comprehensive income (loss)			(8)
Unrealized holding gains (losses) on derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gains (Losses) On Derivatives	(376)		(376)		(423)
Other comprehensive income (loss) before reclassifications			(200)
Amounts reclassified out of accumulated other comprehensive income (loss)			253
Tax effects			(6)
Other comprehensive income (loss)			47
Prior service credits (costs) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Prior Service Credits (Costs)	(43)		(43)		(47)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified out of accumulated other comprehensive income (loss)			4
Tax effects			0
Other comprehensive income (loss)			4
Actuarial gains (losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Actuarial Gains (Losses)	(985)		(985)		(1,004)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified out of accumulated other comprehensive income (loss)			28
Tax effects			(9)
Other comprehensive income (loss)			19
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment	$ (514)		(514)		$ (345)
Other comprehensive income (loss) before reclassifications			(186)
Amounts reclassified out of accumulated other comprehensive income (loss)			0
Tax effects			17
Other comprehensive income (loss)			$ (169)