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Price Risk Management Future Year Net Unrealized Gain/Loss Recorded at Balance Sheet Date Expected to Become Realized (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Electricity [Member] |
Commodity contracts: |
2015 | $ 35 us-gaap_OtherCommitmentDueInNextTwelveMonths / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
2016 | 22 us-gaap_OtherCommitmentDueInSecondYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
2017 | 6 us-gaap_OtherCommitmentDueInThirdYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
2018 | 6 us-gaap_OtherCommitmentDueInFourthYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
2019 | 6 us-gaap_OtherCommitmentDueInFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Thereafter | 56 us-gaap_OtherCommitmentDueAfterFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Total | 131 us-gaap_OtherCommitment / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Natural Gas [Member] |
Commodity contracts: |
2015 | 43 us-gaap_OtherCommitmentDueInNextTwelveMonths / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
2016 | 64 us-gaap_OtherCommitmentDueInSecondYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
2017 | 30 us-gaap_OtherCommitmentDueInThirdYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
2018 | 6 us-gaap_OtherCommitmentDueInFourthYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
2019 | 0 us-gaap_OtherCommitmentDueInFifthYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Thereafter | 0 us-gaap_OtherCommitmentDueAfterFifthYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Total | 143 us-gaap_OtherCommitment / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Net Unrealized Loss [Member] |
Commodity contracts: |
2015 | 78 us-gaap_OtherCommitmentDueInNextTwelveMonths / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
2016 | 86 us-gaap_OtherCommitmentDueInSecondYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
2017 | 36 us-gaap_OtherCommitmentDueInThirdYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
2018 | 12 us-gaap_OtherCommitmentDueInFourthYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
2019 | 6 us-gaap_OtherCommitmentDueInFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Thereafter | 56 us-gaap_OtherCommitmentDueAfterFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Total | $ 274 us-gaap_OtherCommitment / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember

X
- Details
Name: | por_CurrentAssetsCommodityContractsAbstract
Namespace Prefix: | por_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing after the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the fourth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of other commitment maturing in the next fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the second fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the third fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=por_ElectricityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
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Name: | us-gaap_DerivativeInstrumentRiskAxis=por_UnrealizedGainLossOnDerivativesMember
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X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |