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Long-term Debt Schedule of Long Term Debt Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
First Mortgage Bonds, rates range from 3.46% to 9.31%, with a weighted average rate of 5.42% in 2014 and 5.62% in 2013, due at various dates through 2048	$ 2,075por_LongTermDebtFirstMortgageBonds	$ 1,795por_LongTermDebtFirstMortgageBonds
Unsecured Debt, Current	305us-gaap_UnsecuredDebtCurrent	0us-gaap_UnsecuredDebtCurrent
Pollution Control Revenue Bonds, 5% rate, due 2033	142us-gaap_LongtermPollutionControlBondCurrentAndNoncurrent	148us-gaap_LongtermPollutionControlBondCurrentAndNoncurrent
Pollution Control Revenue Bonds owned by PGE	(21)por_PollutionControlRevenueBondsOwnedByPge	(27)por_PollutionControlRevenueBondsOwnedByPge
Total long-term debt	2,501us-gaap_LongTermDebt	1,916us-gaap_LongTermDebt
Less: current portion of long-term debt	(375)us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion	$ 2,126us-gaap_LongTermDebtNoncurrent	$ 1,916us-gaap_LongTermDebtNoncurrent

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Long-term Debt - First Mortgage Bonds

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- Definition

Pollution Control Revenue Bonds owned by PGE

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Represents the current and noncurrent portions of a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer.

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-Publisher SEC

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Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer.

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