Other Financial Data (Changes in Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of January 1, 2014			$ (2,287)
Other comprehensive income before reclassifications			17
Amounts reclassified from accumulated other comprehensive loss			25
Total other comprehensive income	25	10	42	(9)
Balance as of June 28, 2014	(2,245)		(2,245)
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of January 1, 2014			(1)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			1
Total other comprehensive income			1
Balance as of June 28, 2014	0		0
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of January 1, 2014			(2)
Other comprehensive income before reclassifications			2
Amounts reclassified from accumulated other comprehensive loss			0
Total other comprehensive income			2
Balance as of June 28, 2014	0		0
Retirement Benefit Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of January 1, 2014			(2,188)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			24
Total other comprehensive income			24
Balance as of June 28, 2014	(2,164)		(2,164)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of January 1, 2014			(96)
Other comprehensive income before reclassifications			15
Amounts reclassified from accumulated other comprehensive loss			0
Total other comprehensive income			15
Balance as of June 28, 2014	$ (81)		$ (81)