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Income Taxes (Components of Net Accumulated Deferred Income Tax Liability) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Property and software related | $ 572 eix_DeferredTaxAssetsPropertyAndSoftwareRelated | $ 523 eix_DeferredTaxAssetsPropertyAndSoftwareRelated
Nuclear decommissioning trust assets in excess of nuclear ARO liability | 441 eix_DeferredTaxAssetsUnrealizedGainsAndLosses | 569 eix_DeferredTaxAssetsUnrealizedGainsAndLosses
Loss and credit carryforwards | 1,657 eix_DeferredTaxAssetsLossAndCreditCarryforwards | 2,228 eix_DeferredTaxAssetsLossAndCreditCarryforwards
Regulatory balancing accounts | 18 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities | 139 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
Pension and PBOPs | 510 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 283 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Other | 582 us-gaap_DeferredTaxAssetsOther | 712 us-gaap_DeferredTaxAssetsOther
Sub-total | 3,780 us-gaap_DeferredTaxAssetsGross | 4,454 us-gaap_DeferredTaxAssetsGross
Less valuation allowance | 29 us-gaap_DeferredTaxAssetsValuationAllowance | 1,380 us-gaap_DeferredTaxAssetsValuationAllowance
Total | 3,751 us-gaap_DeferredTaxAssetsNet | 3,074 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |
Property-related | 8,709 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 7,879 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Capitalized software costs | 285 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware | 318 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware
Regulatory balancing accounts | 577 us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities | 625 us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
Nuclear decommissioning trust assets | 441 us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome | 569 us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
PBOPs | 227 eix_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationandBenefitsPensionandPBOPs | 6 eix_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationandBenefitsPensionandPBOPs
Other | 274 us-gaap_DeferredTaxLiabilitiesOther | 497 us-gaap_DeferredTaxLiabilitiesOther
Total | 10,513 us-gaap_DeferredIncomeTaxLiabilities | 9,894 us-gaap_DeferredIncomeTaxLiabilities
Accumulated deferred income tax liability, net | 6,762 us-gaap_DeferredTaxAssetsLiabilitiesNet | 6,820 us-gaap_DeferredTaxAssetsLiabilitiesNet
Included in deferred credits and other liabilities | 7,214 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | 7,241 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Included in current liabilities (assets) | (452)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | (421)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Southern California Edison |  |
Deferred tax assets: |  |
Property and software related | 571 eix_DeferredTaxAssetsPropertyAndSoftwareRelated / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 523 eix_DeferredTaxAssetsPropertyAndSoftwareRelated / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Nuclear decommissioning trust assets in excess of nuclear ARO liability | 441 eix_DeferredTaxAssetsUnrealizedGainsAndLosses / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 569 eix_DeferredTaxAssetsUnrealizedGainsAndLosses / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Loss and credit carryforwards | 205 eix_DeferredTaxAssetsLossAndCreditCarryforwards / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 427 eix_DeferredTaxAssetsLossAndCreditCarryforwards / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Regulatory balancing accounts | 18 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 139 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Pension and PBOPs | 321 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 105 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Other | 445 us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 544 us-gaap_DeferredTaxAssetsOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Sub-total | 2,001 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 2,307 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Less valuation allowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 0 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total | 2,001 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 2,307 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Deferred tax liabilities: |  |
Property-related | 8,699 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 7,869 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Capitalized software costs | 285 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 318 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Regulatory balancing accounts | 577 us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 625 us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Nuclear decommissioning trust assets | 441 us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 569 us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
PBOPs | 227 eix_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationandBenefitsPensionandPBOPs / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 6 eix_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationandBenefitsPensionandPBOPs / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Other | 171 us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 393 us-gaap_DeferredTaxLiabilitiesOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total | 10,400 us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 9,780 us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Accumulated deferred income tax liability, net | 8,399 us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 7,473 us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Included in deferred credits and other liabilities | 8,190 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 7,737 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Included in current liabilities (assets) | $ 209 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ (264)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember

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