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Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Price risk management $ 88por_DeferredTaxAssetsPriceRiskManagement $ 71por_DeferredTaxAssetsPriceRiskManagement
Employee benefits 161us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 122us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Deferred Tax Assets, tax credits, net of valuation allowance 13por_DeferredTaxAssetsTaxCreditsNetOfValuationAllowance 51por_DeferredTaxAssetsTaxCreditsNetOfValuationAllowance
Deferred income taxes 48us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities 33us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
Deferred Tax Assets, Tax Deferred Expense, Other 1us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Total deferred income tax assets 311us-gaap_DeferredTaxAssetsNet 277us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Depreciation and amortization 693us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 646us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Regulatory assets 210us-gaap_DeferredTaxLiabilitiesRegulatoryAssets 175us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Total deferred income tax liabilities 903us-gaap_DeferredTaxLiabilities 821us-gaap_DeferredTaxLiabilities
Deferred income tax liability, net (592)us-gaap_DeferredTaxAssetsLiabilitiesNet (544)us-gaap_DeferredTaxAssetsLiabilitiesNet
Classification of net deferred income taxes:    
Current deferred income tax asset 33us-gaap_DeferredTaxAssetsNetCurrent 42us-gaap_DeferredTaxAssetsNetCurrent
Noncurrent deferred income tax liability $ (625)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (586)us-gaap_DeferredTaxLiabilitiesNoncurrent