Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 174us-gaap_ProfitLoss	$ 104us-gaap_ProfitLoss	$ 140us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	301	248	248
Increase (decrease) in net liabilities from price risk management activities	45	(18)	(175)
Regulatory deferrals—price risk management activities	(45)	18	172
Cascade Crossing transmission project	0por_ExpensesrelatedtoCascadeCrossing	52por_ExpensesrelatedtoCascadeCrossing	0por_ExpensesrelatedtoCascadeCrossing
Deferred income taxes	39us-gaap_DeferredIncomeTaxExpenseBenefit	11us-gaap_DeferredIncomeTaxExpenseBenefit	47us-gaap_DeferredIncomeTaxExpenseBenefit
Allowance for equity funds used during construction	(37)	(13)	(6)
Pension and other postretirement benefits	33	37	27
Regulatory deferral of settled derivative instruments	10us-gaap_GainLossOnContractTermination	7us-gaap_GainLossOnContractTermination	(9)us-gaap_GainLossOnContractTermination
Unrealized losses on non-qualified benefit plan trust assets	7us-gaap_UnrealizedGainLossOnSecurities	3us-gaap_UnrealizedGainLossOnSecurities	3us-gaap_UnrealizedGainLossOnSecurities
Decoupling mechanism deferrals, net of amortization	6por_DecouplingMechanismDeferralsNet	(6)por_DecouplingMechanismDeferralsNet	2por_DecouplingMechanismDeferralsNet
Power cost deferrals, net of amortization	0	(6)	(4)
Other non-cash income and expenses, net	12us-gaap_OtherNoncashIncomeExpense	18us-gaap_OtherNoncashIncomeExpense	17us-gaap_OtherNoncashIncomeExpense
Changes in working capital, net of effects from purchase of 10% interest in Boardman:
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(Increase) decrease in margin deposits	(2)	37	34
Income tax refund received	0us-gaap_ProceedsFromIncomeTaxRefunds	0us-gaap_ProceedsFromIncomeTaxRefunds	8us-gaap_ProceedsFromIncomeTaxRefunds
(Decrease) increase in payables and accrued liabilities	(13)	14	1
Other working capital items, net	(12)	17	1
Cash received to be returned to customers pursuant to the Residential Exchange Program	13por_CashReceivedfromBPA	1por_CashReceivedfromBPA	0por_CashReceivedfromBPA
Proceeds received from Trojan spent fuel legal settlement	6us-gaap_ProceedsFromLegalSettlements	44us-gaap_ProceedsFromLegalSettlements	0us-gaap_ProceedsFromLegalSettlements
Contribution to non-qualified employee benefit trust	(8)	(6)	0
Contribution to voluntary employees’ benefit association trust	(3)	(3)	(2)
Other, net	(16)	(15)	(6)
Net cash provided by operating activities	518	544	494
Cash flows from investing activities:
Capital expenditures	(1,007)	(656)	(303)
Purchases of nuclear decommissioning trust securities	(19)	(26)	(26)
Sales of nuclear decommissioning trust securities	17	25	23
Contribution to nuclear decommissioning fund	(6)	(44)	0
Cash received in connection with purchase of 10% interest in Boardman, net of cash paid	8us-gaap_CashAcquiredFromAcquisition	0us-gaap_CashAcquiredFromAcquisition	0us-gaap_CashAcquiredFromAcquisition
Proceeds received from insurance recoveries	3	6	0
Proceeds from sale of properties	5	0	10
Other, net	5	3	2
Net cash used in investing activities	(994)	(692)	(294)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	585	380	0
Payments on long-term debt	0us-gaap_RepaymentsOfLongTermDebt	(100)us-gaap_RepaymentsOfLongTermDebt	(100)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of common stock, net of issuance costs	0	67	0
Borrowings on short-term debt	0us-gaap_ProceedsFromShortTermDebt	35us-gaap_ProceedsFromShortTermDebt	0us-gaap_ProceedsFromShortTermDebt
Payments on short-term debt	0us-gaap_RepaymentsOfShortTermDebt	(35)us-gaap_RepaymentsOfShortTermDebt	0us-gaap_RepaymentsOfShortTermDebt
Maturities of commercial paper, net	0us-gaap_RepaymentsOfCommercialPaper	(17)us-gaap_RepaymentsOfCommercialPaper	(13)us-gaap_RepaymentsOfCommercialPaper
Dividends paid	(87)us-gaap_PaymentsOfDividends	(84)us-gaap_PaymentsOfDividends	(81)us-gaap_PaymentsOfDividends
Debt issuance costs	(2)us-gaap_PaymentsOfDebtIssuanceCosts	(3)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Net cash provided by (used in) financing activities	496	243	(194)
Increase in cash and cash equivalents	20	95	6
Cash and cash equivalents, beginning of year	107	12	6
Cash and cash equivalents, end of year	127	107	12
Supplemental disclosures of cash flow information:
Cash paid for interest, net of amounts capitalized	86us-gaap_InterestPaidNet	90us-gaap_InterestPaidNet	97us-gaap_InterestPaidNet
Cash paid for income taxes	22us-gaap_IncomeTaxesPaid	10us-gaap_IncomeTaxesPaid	13us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:
Accrued capital additions	70	84	19
Accrued dividends payable	23	22	21
Accrued sales tax refund	23por_Accruedsalestaxrefund	0por_Accruedsalestaxrefund	0por_Accruedsalestaxrefund
Preliminary engineering transferred to Construction work in progress from Other noncurrent assets	$ 0	$ 9	$ 0

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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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