Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Taxes (Textuals) [Abstract]
Tax Expense	$ 123	$ 8
Income (Loss) before Income Taxes	359	(30)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	4
Deferred Tax Asset Valuation Allowance Release Reasonably Possible Tax Benefit	80
Unrecognized tax benefits			81
Favorable impact of unrecognized tax benefits if recognized			65
Accrued interest			15
Unsettled unrecognized tax benefits that would require cash			26
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit			15
Accrued Interest Favorably Settled In Next Twelve Months			$ 5