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Consolidated Statements of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues, net	$ 1,900us-gaap_ElectricUtilityRevenue	$ 1,810us-gaap_ElectricUtilityRevenue	$ 1,805us-gaap_ElectricUtilityRevenue
Operating expenses:
Purchased power and fuel	713us-gaap_CostOfPurchasedPower	757us-gaap_CostOfPurchasedPower	726us-gaap_CostOfPurchasedPower
Generation, transmission and distribution	257us-gaap_ElectricProductionExpense	225us-gaap_ElectricProductionExpense	211us-gaap_ElectricProductionExpense
Cascade Crossing transmission project	0por_ExpensesrelatedtoCascadeCrossing	52por_ExpensesrelatedtoCascadeCrossing	0por_ExpensesrelatedtoCascadeCrossing
Administrative and other	227us-gaap_GeneralAndAdministrativeExpense	219us-gaap_GeneralAndAdministrativeExpense	216us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	301us-gaap_DepreciationDepletionAndAmortization	248us-gaap_DepreciationDepletionAndAmortization	248us-gaap_DepreciationDepletionAndAmortization
Taxes other than income taxes	109us-gaap_TaxesExcludingIncomeAndExciseTaxes	103us-gaap_TaxesExcludingIncomeAndExciseTaxes	102us-gaap_TaxesExcludingIncomeAndExciseTaxes
Total operating expenses	1,607us-gaap_CostsAndExpenses	1,604us-gaap_CostsAndExpenses	1,503us-gaap_CostsAndExpenses
Income from operations	293us-gaap_OperatingIncomeLoss	206us-gaap_OperatingIncomeLoss	302us-gaap_OperatingIncomeLoss
Interest expense, net	96us-gaap_InterestExpense	101us-gaap_InterestExpense	108us-gaap_InterestExpense
Other income:
Allowance for equity funds used during construction	37us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	13us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	6us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Miscellaneous income, net	1us-gaap_OtherNonoperatingIncomeExpense	7us-gaap_OtherNonoperatingIncomeExpense	4us-gaap_OtherNonoperatingIncomeExpense
Other income, net	38us-gaap_NonoperatingIncomeExpense	20us-gaap_NonoperatingIncomeExpense	10us-gaap_NonoperatingIncomeExpense
Income before income taxes	235us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	125us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	204us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	61us-gaap_IncomeTaxExpenseBenefit	21us-gaap_IncomeTaxExpenseBenefit	64us-gaap_IncomeTaxExpenseBenefit
Net income	174us-gaap_ProfitLoss	104us-gaap_ProfitLoss	140us-gaap_ProfitLoss
Less: net loss attributable to noncontrolling interest	(1)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(1)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(1)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Portland General Electric Company	$ 175us-gaap_NetIncomeLoss	$ 105us-gaap_NetIncomeLoss	$ 141us-gaap_NetIncomeLoss
Weighted-average shares outstanding (in thousands):
Basic	78,180us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	76,821us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	75,498us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	80,494us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	77,388us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	75,647us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share:
Basic	$ 2.24us-gaap_EarningsPerShareBasic	$ 1.36us-gaap_EarningsPerShareBasic	$ 1.87us-gaap_EarningsPerShareBasic
Diluted	$ 2.18us-gaap_EarningsPerShareDiluted	$ 1.35us-gaap_EarningsPerShareDiluted	$ 1.87us-gaap_EarningsPerShareDiluted

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