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Income Taxes (Deferred Tax Assets (Liabilities)) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Assets and Liabilities [Abstract]    
Property, plant and equipment $ (3,152)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ (2,807)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Securitized regulatory assets (3)us-gaap_DeferredTaxLiabilitiesRegulatoryAssets (130)us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Pension and benefits (43)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 27us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Deferred Tax Liabilities, Other, net 12us-gaap_DeferredTaxLiabilitiesOther 12us-gaap_DeferredTaxLiabilitiesOther
Current deferred income tax liabilities 2us-gaap_DeferredTaxLiabilitiesCurrent (91)us-gaap_DeferredTaxLiabilitiesCurrent
Long-term deferred income tax liabilities (3,188)us-gaap_DeferredTaxLiabilitiesNoncurrent (2,807)us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred Tax Assets, Net 357us-gaap_DeferredTaxAssetsLiabilitiesNet 420us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Tax Liabilities, Net (3,543)us-gaap_DeferredTaxLiabilities (3,318)us-gaap_DeferredTaxLiabilities
Deferred income tax liabilities $ (3,186)us-gaap_DeferredIncomeTaxLiabilities $ (2,898)us-gaap_DeferredIncomeTaxLiabilities