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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 174us-gaap_ProfitLoss	$ 104us-gaap_ProfitLoss	$ 140us-gaap_ProfitLoss
Other comprehensive income (loss) - Change in compensation retirement benefits liability and amortization, net of taxes of $2 in 2014 and $(1) in 2013	(2)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	1us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Comprehensive income	172us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	105us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	140us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: comprehensive loss attributable to the noncontrolling interests	1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Comprehensive income attributable to Portland General Electric Company	$ 173us-gaap_ComprehensiveIncomeNetOfTax	$ 106us-gaap_ComprehensiveIncomeNetOfTax	$ 141us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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