Comprehensive Income, Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - beginning balance			$ (399)
Other comprehensive income before reclassifications			2,259
Amounts reclassified out of accumulated other comprehensive ncome			(24)
Tax effects			(788)
Other comprehensive income (loss)	903	356	1,447	280
Accumulated other comprehensive income (loss) - ending balance	1,048		1,048
Unrealized holding gains (losses) on available-for-sale investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - beginning balance			701
Other comprehensive income before reclassifications			2,258
Amounts reclassified out of accumulated other comprehensive ncome			(142)
Tax effects			(740)
Other comprehensive income (loss)			1,376
Accumulated other comprehensive income (loss) - ending balance	2,077		2,077
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - beginning balance			93
Other comprehensive income before reclassifications			0
Amounts reclassified out of accumulated other comprehensive ncome			0
Tax effects			(20)
Other comprehensive income (loss)			(20)
Accumulated other comprehensive income (loss) - ending balance	73		73
Unrealized holding gains (losses) on derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - beginning balance			93
Other comprehensive income before reclassifications			(105)
Amounts reclassified out of accumulated other comprehensive ncome			37
Tax effects			31
Other comprehensive income (loss)			(37)
Accumulated other comprehensive income (loss) - ending balance	56		56
Prior service credits (costs) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - beginning balance			(32)
Other comprehensive income before reclassifications			0
Amounts reclassified out of accumulated other comprehensive ncome			4
Tax effects			0
Other comprehensive income (loss)			4
Accumulated other comprehensive income (loss) - ending balance	(28)		(28)
Actuarial gains (losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - beginning balance			(1,122)
Other comprehensive income before reclassifications			77
Amounts reclassified out of accumulated other comprehensive ncome			77
Tax effects			(53)
Other comprehensive income (loss)			101
Accumulated other comprehensive income (loss) - ending balance	(1,021)		(1,021)
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - beginning balance			(132)
Other comprehensive income before reclassifications			29
Amounts reclassified out of accumulated other comprehensive ncome			0
Tax effects			(6)
Other comprehensive income (loss)			23
Accumulated other comprehensive income (loss) - ending balance	$ (109)		$ (109)