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Income Taxes - Deferred Tax Assets and Liabilities as Presented in Consolidated Balance Sheets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Deferred income taxes (current) $ 5us-gaap_DeferredTaxAssetsNetCurrent $ 9us-gaap_DeferredTaxAssetsNetCurrent
Deferred income taxes (non-current) 14us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 0us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Deferred Tax Assets, Net 19us-gaap_DeferredTaxAssetsLiabilitiesNet 9us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred income taxes (current) 217us-gaap_DeferredTaxLiabilitiesCurrent 289us-gaap_DeferredTaxLiabilitiesCurrent
Deferred income taxes (non-current) 2,079us-gaap_DeferredTaxLiabilitiesNoncurrent 2,476us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liability $ 2,277us-gaap_DeferredTaxLiabilities $ 2,756us-gaap_DeferredTaxLiabilities