Other Financial Data (Changes in Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 29, 2013	Mar. 30, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ (3,319)	$ (3,300)		$ (3,300)
Other comprehensive loss before reclassifications	(6)	(37)
Amounts reclassified from accumulated other comprehensive loss	16	18
Net current-period other comprehensive income (loss)	10	(19)	34	(9)	83
Balance	(3,309)	(3,319)		(3,309)
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	0	1		1
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	0	(1)
Net current-period other comprehensive income (loss)	0	(1)
Balance	0	0		0
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	2	2		2
Other comprehensive loss before reclassifications	(1)	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income (loss)	(1)	0
Balance	1	2		1
Retirmenet Benefits Items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(3,192)	(3,211)		(3,211)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	16	19
Net current-period other comprehensive income (loss)	16	19
Balance	(3,176)	(3,192)		(3,176)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(129)	(92)		(92)
Other comprehensive loss before reclassifications	(5)	(37)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income (loss)	(5)	(37)
Balance	$ (134)	$ (129)		$ (134)