Equity Equity - AOCI Changes Net of Tax Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended												3 Months Ended
	Mar. 31, 2014	Mar. 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] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Mar. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Mar. 31, 2014 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Dec. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Mar. 30, 2014 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]	Mar. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]	Mar. 31, 2014 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]	Dec. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]	Mar. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]	Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) Period Start	$ (162)			$ (162)		$ (182)			$ (153)	$ (167)	$ (178)	$ (189)			$ 0	$ 5	$ 8	$ 7
Other comprehensive income before reclassifications			3		(6)		3	(1)					0	(5)
Amounts reclassified from accumulated other comprehensive income			6	6	18	18	11	12					(5)	6
Net current period other comprehensive income	9	12	9		12		14	11					(5)	1
Accumulated Other Comprehensive Income (Loss) Period End	$ (153)			$ (153)		$ (170)			$ (153)	$ (167)	$ (178)	$ (189)			$ 0	$ 5	$ 8	$ 7