Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Taxes (Textuals) [Abstract]
Tax expense	$ 8	$ 19
Income (Loss) before Income Taxes	(30)	50
Tax impact due to law change		12
Deferred Tax Asset Valuation Allowance Release Reasonably Possible Tax Benefit	80
Unrecognized tax benefits			88
Favorable impact of unrecognized tax benefits if recognized			78
Accrued interest			16
Unsettled unrecognized tax benefits that would require cash			32
Domestic Tax Authority
Income Taxes (Textuals) [Abstract]
Deferred Tax Assets, Valuation Allowance			$ 2,400