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v2.4.1.9

Future year net unrealized gain/loss recorded at balance sheet date expected to become realized (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Commodity contracts: |
Other Commitment, Due in Next Twelve Months | $ 14 us-gaap_OtherCommitmentDueInNextTwelveMonths
Other Commitment, Due in Second Year | 11 us-gaap_OtherCommitmentDueInSecondYear
Other Commitment, Due in Third Year | 11 us-gaap_OtherCommitmentDueInThirdYear
Other Commitment, Due in Fourth Year | 7 us-gaap_OtherCommitmentDueInFourthYear
Total | 43 us-gaap_OtherCommitment
Electricity [Member] |
Commodity contracts: |
Other Commitment, Due in Next Twelve Months | 50 us-gaap_OtherCommitmentDueInNextTwelveMonths / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Other Commitment, Due in Second Year | 19 us-gaap_OtherCommitmentDueInSecondYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Other Commitment, Due in Third Year | 6 us-gaap_OtherCommitmentDueInThirdYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Other Commitment, Due in Fourth Year | 5 us-gaap_OtherCommitmentDueInFourthYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Other Commitment, Due in Fifth Year | 5 us-gaap_OtherCommitmentDueInFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Other Commitment, Due after Fifth Year | 22 us-gaap_OtherCommitmentDueAfterFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Total | 107 us-gaap_OtherCommitment / us-gaap_DerivativeInstrumentRiskAxis = por_ElectricityMember
Natural Gas [Member] |
Commodity contracts: |
Other Commitment, Due in Next Twelve Months | 49 us-gaap_OtherCommitmentDueInNextTwelveMonths / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Other Commitment, Due in Second Year | 44 us-gaap_OtherCommitmentDueInSecondYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Other Commitment, Due in Third Year | 18 us-gaap_OtherCommitmentDueInThirdYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Other Commitment, Due in Fourth Year | 3 us-gaap_OtherCommitmentDueInFourthYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Other Commitment, Due in Fifth Year | 0 us-gaap_OtherCommitmentDueInFifthYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Other Commitment, Due after Fifth Year | 0 us-gaap_OtherCommitmentDueAfterFifthYear / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Total | 114 us-gaap_OtherCommitment / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_NaturalGasReservesMember
Unrealized Gain Loss On Derivatives [Member] |
Commodity contracts: |
Other Commitment, Due in Next Twelve Months | 99 us-gaap_OtherCommitmentDueInNextTwelveMonths / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Other Commitment, Due in Second Year | 63 us-gaap_OtherCommitmentDueInSecondYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Other Commitment, Due in Third Year | 24 us-gaap_OtherCommitmentDueInThirdYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Other Commitment, Due in Fourth Year | 8 us-gaap_OtherCommitmentDueInFourthYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Other Commitment, Due in Fifth Year | 5 us-gaap_OtherCommitmentDueInFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Other Commitment, Due after Fifth Year | 22 us-gaap_OtherCommitmentDueAfterFifthYear / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember
Total | $ 221 us-gaap_OtherCommitment / us-gaap_DerivativeInstrumentRiskAxis = por_UnrealizedGainLossOnDerivativesMember

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
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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 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

X
- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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