Income Taxes (Components of Income Tax Expense (Benefit)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Current:
Federal	$ (12)	$ (16)		$ (1)
State	16	12		10
Foreign	14	3		3
Total current	18	(1)		12
Deferred:
Federal	11	(33)		(70)
State	(5)	9		0
Foreign	(5)	3		(10)
Total deferred	1	(21)		(80)
Total income tax expense (benefit)	$ 19	$ (22)	[1]	$ (68)

[1] Includes approximately $13 million in intraperiod tax expense related to a prior period with an offsetting benefit in OCI.