Accumulated Other Comprehensive Income and Supplemental Equity Information Accumulated Other Comprehensive Income (Loss) and Supplemental Equity Information (Schedule of Reclassification out of 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
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	$ 0	$ 3	$ 0	$ 3
Other Expense, Net [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	5	0	5
Income Tax Expense [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ 0	$ (2)	$ 0	$ (2)