Derivative and Hedging Activities - Cash Flow Hedges Components of AOCI Table (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended										3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 30, 2014 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2014 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Mar. 30, 2014 Accumulated Other Comprehensive Income (Loss) [Member] Balance Before Tax	Mar. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Balance Before Tax	Mar. 31, 2014 Accumulated Other Comprehensive Income (Loss) [Member] Balance Before Tax	Dec. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Balance Before Tax	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Balance Before Tax	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member] Balance Before Tax	Mar. 30, 2014 Accumulated Other Comprehensive Income (Loss) [Member] Balance After Tax	Mar. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Balance After Tax	Mar. 31, 2014 Accumulated Other Comprehensive Income (Loss) [Member] Balance After Tax	Dec. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Balance After Tax	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Balance After Tax	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member] Balance After Tax
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss) Period Start	$ (153)	$ (162)		$ (162)		$ (182)			$ (247)	$ (269)	$ (287)	$ (304)			$ (153)	$ (167)	$ (178)	$ (189)
Other Comprehensive Income Before Reclassifications, Net of Tax							4	(2)					3	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			6	6	18	18	18	19					11	12
Accumulated Other Comprehensive Income (Loss) Period End	$ (153)	$ (162)		$ (153)		$ (170)			$ (247)	$ (269)	$ (287)	$ (304)			$ (153)	$ (167)	$ (178)	$ (189)