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Discontinued Operations (Textual) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Aug. 31, 2014 installment | Apr. 30, 2014 | Apr. 01, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Portion of Settlement Payment |  |  |  |  |  |  |  |  | $ 225 eix_CashPortionofSettlementPayment | $ 0 eix_CashPortionofSettlementPayment | $ 0 eix_CashPortionofSettlementPayment |  |  |  |
Income (loss) from discontinued operations, net of tax | 39 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 184 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (22)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 37 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (25)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 12 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 12 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 185 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 36 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1,686)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |  |
Edison International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment and other charges, after tax |  |  |  |  |  |  |  |  |  |  | 1,300 eix_LongLivedAssetsHeldForAbandonmentImpairmentChargeAfterTaxLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,300 eix_LongLivedAssetsHeldForAbandonmentImpairmentChargeAfterTaxLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 185 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 36 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,686)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  |  |  |  |  |  |  | 22 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Edison Mission Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Portion of Settlement Payment |  |  |  |  |  |  |  |  | 225 eix_CashPortionofSettlementPayment / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember |  |  |  |  | 225 eix_CashPortionofSettlementPayment / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember |
Liabilities for tax and pension related to deconsolidation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 342 eix_LiabilitiesForJointTaxandQualifiedRetirementPlansResultingfromDeconsolidation / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember
Number of Installments |  |  |  |  |  |  |  |  | 2 eix_NumberofInstallments / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember |  |  |  | 2 eix_NumberofInstallments / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember |  |
Installment one, tax attribute settlement |  |  |  |  |  |  |  |  |  |  |  |  | 204 eix_TaxAttributeIncludingInterestInstallmentOne / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember |  |
Installment two, tax attribute settlement |  |  |  |  |  |  |  |  |  |  |  |  | 214 eix_TaxAttributeIncludingInterestInstallmentTwo / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember |  |
Pre-tax loss related to reorganization settlement |  |  |  |  |  |  |  |  | 525 us-gaap_GainLossRelatedToLitigationSettlement / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember |  |  |  |  |  |
Homer City |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment and other charges, after tax |  |  |  |  |  |  |  |  |  |  | 53 eix_LongLivedAssetsHeldForAbandonmentImpairmentChargeAfterTaxLoss / dei_LegalEntityAxis = eix_HomerCityMember |  |  |  |
Discontinued Operations | Edison Mission Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Related to Reorganization Settlement |  |  |  |  |  |  |  |  | 168 eix_GainLossRelatedtoReorganizationSettlement / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |
Internal Revenue Service (IRS) | Tax Years 2003 to 2006 | Discontinued Operations | Edison Mission Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  |  |  |  |  |  |  | $ (39)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / dei_LegalEntityAxis = eix_EdisonMissionEnergyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember / eix_TaxPeriodAxis = eix_TaxYears2003to2006Member |  |  |  |  |  |

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