Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Taxes (Textuals) [Abstract]
Tax Expense	$ 100	$ 54	$ 168	$ 136
Income (Loss) before Income Taxes	299	249	561	555
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount			47
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			37
Unfavorable (favorable) tax impact due to law change			11	(5)
Deferred Tax Asset Valuation Allowance Release Reasonably Possible Tax Benefit	105		105
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