Basis of Presentation and Summary of Significant Accounting Policies AOCI Changes Net of Tax Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Accumulated Net Unrealized Investment Gain (Loss) [Member]	Sep. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Sep. 29, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Sep. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member]	Sep. 29, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Sep. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Sep. 29, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]	Sep. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI (Loss), Net of Tax - Period Start			$ (182)		$ 5			$ (182)		$ (189)		$ 7
Other comprehensive income before reclassifications							(4)		2		(6)
Amounts reclassified from accumulated other comprehensive income						0	17	17	13		4
Net current period other comprehensive income	1	(6)	13	(22)				13		15		(2)
AOCI (Loss), Net of Tax - Period End	$ (169)		$ (169)		$ 5					$ (174)