Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 50us-gaap_ProfitLoss	$ 58us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	75	75
Increase (decrease) in net liabilities from price risk management activities	53	(19)
Regulatory deferrals-price risk management activities	(53)	19
Deferred income taxes	10us-gaap_DeferredIncomeTaxExpenseBenefit	15us-gaap_DeferredIncomeTaxExpenseBenefit
Pension and other postretirement benefits	9	8
Allowance for equity funds used during construction	(4)	(6)
Regulatory deferral of settled derivative instruments	2	5
Decoupling mechanism deferrals, net of amortization	(3)por_DecouplingMechanismDeferralsNet	(4)por_DecouplingMechanismDeferralsNet
Other non-cash income and expenses, net	6us-gaap_OtherNoncashIncomeExpense	7us-gaap_OtherNoncashIncomeExpense
Changes in working capital:
Decrease in accounts receivable and unbilled revenues	37us-gaap_IncreaseDecreaseInReceivables	14us-gaap_IncreaseDecreaseInReceivables
(Increase) decrease in Inventories	(13)us-gaap_IncreaseDecreaseInInventories	2us-gaap_IncreaseDecreaseInInventories
Increase in margin deposits, net	(9)	(8)
Decrease in accounts payable and accrued liabilities	(1)	(6)
Other working capital items, net	(20)	(15)
Cash received to be returned to customers pursuant to the Residential Exchange Program	1por_CashReceivedfromBPA	15por_CashReceivedfromBPA
Other, net	(6)	(2)
Net cash provided by operating activities	134	158
Cash flows from investing activities:
Capital expenditures	(178)	(185)
Sales tax refund received related to Tucannon River Wind Farm	12us-gaap_ProceedsFromIncomeTaxRefunds	0us-gaap_ProceedsFromIncomeTaxRefunds
Sales of nuclear decommissioning trust securities	4	6
Purchases of nuclear decommissioning trust securities	(5)us-gaap_PaymentsToAcquireInvestments	(6)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of property	0	4
Other, net	0	2
Net cash used in investing activities	(167)	(179)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	75	0
Payments on long-term debt	(120)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(22)us-gaap_PaymentsOfDividends	(22)us-gaap_PaymentsOfDividends
Net cash used in financing activities	(67)	(22)
Decrease in cash and cash equivalents	(100)	(43)
Cash and cash equivalents, beginning of period	127	107
Cash and cash equivalents, end of period	27	64
Supplemental cash flow information is as follows:
Cash paid for interest, net of amounts capitalized	14us-gaap_InterestPaidNet	10us-gaap_InterestPaidNet
Non-cash investing and financing activities:
Accrued capital additions	62	69
Accrued dividends payable	$ 22	$ 22

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