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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Income Taxes    
Statutory U.S. Federal tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Period of cumulative income position of the operations 3 years  
Valuation allowance   $ 927us-gaap_DeferredTaxAssetsValuationAllowance