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Employee Benefits Schedule of Fair Value, Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Defined Benefit Pension Plan assets: |  |  |
Money market funds | $ 6 por_MoneyMarketFundsDefinedBenefitPensionPlanAssets |  |
Equity securities: |  |  |
Domestic | 188 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets | 185 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets |
International equity securities - defined benefit pension plan assets | 171 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets | 185 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets |
Debt securities: |  |  |
Domestic government and corporate credit | 197 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets | 181 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets |
Corporate credit |  | 14 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue |
Private equity funds | 29 por_PrivateEquityFunds | 31 por_PrivateEquityFunds |
Defined Benefit Plan, Fair Value of Plan Assets | 591 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets | 596 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |
Other Postretirement Benefit Plans assets: [Abstract] |  |  |
Money market funds | 6 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue | 10 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue |
Domestic equity securities - Other postretirement benefit plan assets at fair value | 11 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue | 10 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue |
International equity securities - other post retirement assets at fair value | 10 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue | 9 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue |
Debt securities—Domestic government | 5 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets | 3 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets |
Other post retirement benefit plan assets total | 32 por_OtherPostRetirementBenefitPlanAssetsTotal | 32 por_OtherPostRetirementBenefitPlanAssetsTotal |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Pension Plan assets: |  |  |
Money market funds | 0 por_MoneyMarketFundsDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Equity securities: |  |  |
Domestic | 42 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 166 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
International equity securities - defined benefit pension plan assets | 0 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 185 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Debt securities: |  |  |
Domestic government and corporate credit | 0 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Corporate credit |  | 14 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Private equity funds | 0 por_PrivateEquityFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 por_PrivateEquityFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Defined Benefit Plan, Fair Value of Plan Assets | 42 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 365 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Other Postretirement Benefit Plans assets: [Abstract] |  |  |
Money market funds | 0 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Domestic equity securities - Other postretirement benefit plan assets at fair value | 10 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 8 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
International equity securities - other post retirement assets at fair value | 10 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 9 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Debt securities—Domestic government | 5 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Other post retirement benefit plan assets total | 25 por_OtherPostRetirementBenefitPlanAssetsTotal / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 20 por_OtherPostRetirementBenefitPlanAssetsTotal / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Pension Plan assets: |  |  |
Money market funds | 6 por_MoneyMarketFundsDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Equity securities: |  |  |
Domestic | 146 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 19 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
International equity securities - defined benefit pension plan assets | 171 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Debt securities: |  |  |
Domestic government and corporate credit | 197 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 181 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Corporate credit |  | 0 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Private equity funds | 0 por_PrivateEquityFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 por_PrivateEquityFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Defined Benefit Plan, Fair Value of Plan Assets | 520 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 200 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Other Postretirement Benefit Plans assets: [Abstract] |  |  |
Money market funds | 6 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 10 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Domestic equity securities - Other postretirement benefit plan assets at fair value | 1 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 2 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
International equity securities - other post retirement assets at fair value | 0 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Debt securities—Domestic government | 0 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Other post retirement benefit plan assets total | 7 por_OtherPostRetirementBenefitPlanAssetsTotal / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 12 por_OtherPostRetirementBenefitPlanAssetsTotal / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Pension Plan assets: |  |  |
Money market funds | 0 por_MoneyMarketFundsDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Equity securities: |  |  |
Domestic | 0 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
International equity securities - defined benefit pension plan assets | 0 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Debt securities: |  |  |
Domestic government and corporate credit | 0 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Corporate credit |  | 0 us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Private equity funds | 29 por_PrivateEquityFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 31 por_PrivateEquityFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Defined Benefit Plan, Fair Value of Plan Assets | 29 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 31 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 32 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other Postretirement Benefit Plans assets: [Abstract] |  |  |
Money market funds | 0 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 por_FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Domestic equity securities - Other postretirement benefit plan assets at fair value | 0 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
International equity securities - other post retirement assets at fair value | 0 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Debt securities—Domestic government | 0 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 por_DebtSecuritiesDomesticGovernmentOtherPostretirementBenefitPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Other post retirement benefit plan assets total | $ 0 por_OtherPostRetirementBenefitPlanAssetsTotal / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0 por_OtherPostRetirementBenefitPlanAssetsTotal / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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