XML 125 R105.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Commitments and Contingencies (Contingencies Textual) (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2010 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Oct. 31, 2011 plaintiff | Feb. 01, 2012 | Oct. 31, 2013 | Aug. 31, 2014 | Jun. 01, 2014
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation | $ 142,000,000 eix_AmountOfDamagesDecisionByUsCourtOfFederalClaimsSpentNuclearFuelLitigation |  |  |  |  |  |  |  |  |  |  |
Insurance Claims |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Federal Limit on Public Liability Claims from Nuclear Incident, Approximate |  | 13,600,000,000 eix_FederalLimitOnPublicLiabilityClaimsFromNuclearIncidentApproximate / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
San Onofre | Insurance Claims |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  | 433,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |
Southern California Edison |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  | 84,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 98,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies (material sites) |  | 108,000,000 us-gaap_AccrualForEnvironmentalLossContingencies / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Number of Immaterial Sites for Environmental Remediation |  | 38 eix_NumberOfImmaterialSitesForEnvironmentalRemediation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies (immaterial sites) |  | 3,000,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Accrued Environmental Loss Contingencies, Noncurrent |  | 111,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Regulatory Assets, Noncurrent, Environmental Remediation |  | 107,000,000 eix_RegulatoryAssetsNoncurrentEnvironmentalRemediation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Portion of Recorded Liability Recoverable From Incentive Mechanism |  | 36,000,000 eix_PortionOfRecordedLiabilityRecoverableFromIncentiveMechanism / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Percentage of Environmental Remediation Costs Recoverable From Incentive Mechanism |  | 90.00%eix_PercentageOfEnvironmentalRemediationCostsRecoverableFromIncentiveMechanism / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Recorded Liability Incurred at Majority of Remaining Sites Through Customer Rates |  | 71,000,000 eix_RecordedLiabilityIncurredAtMajorityOfRemainingSitesThroughCustomerRates / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Percentage of Environmental Remediation Costs to be Recovered |  | 100.00%eix_PercentageOfEnvironmentalRemediationCostsToBeRecovered / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Amount that Cleanup Costs for Identified Material Sites Could Exceed Recorded Liability |  | 161,000,000 eix_AmountThatCleanupCostsForIdentifiedMaterialSitesCouldExceedRecordedLiability / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Amount that Cleanup Costs for Immaterial Sites Could Exceed Recorded Liability |  | 7,000,000 eix_AmountThatCleanupCostsForImmaterialSitesCouldExceedRecordedLiability / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Maximum Expected Period for Clean Up of Identified Sites |  | 30 years |  |  |  |  |  |  |  |  |  |
Expected Annual Environmental Remediation Costs, Period for Cost Estimates |  | 5 years |  |  |  |  |  |  |  |  |  |
Expected Annual Environmental Remediation Costs, Low End of Range |  | 3,000,000 eix_ExpectedAnnualEnvironmentalRemediationCostsLowEndOfRange / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Expected Annual Environmental Remediation Costs, High End of Range |  | 23,000,000 eix_ExpectedAnnualEnvironmentalRemediationCostsHighEndOfRange / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Environmental Remediation Expense |  | 4,000,000 us-gaap_EnvironmentalRemediationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  | 8,000,000 us-gaap_EnvironmentalRemediationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 10,000,000 us-gaap_EnvironmentalRemediationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |
Insurance Coverage for Wildfire Liabilities Limit |  |  |  |  |  |  |  |  |  |  |  | 547,500,000.0 eix_InsuranceCoverageForWildfireLiabilitiesLimit / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Additional Coverage for Certain Wildfire Liabilities |  | 450,000,000 eix_AdditionalCoverageforCertainWildfireLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Increase In Self Insurance Retention Per Wildfire Occurrence |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 eix_IncreaseInSelfInsuranceRetentionPerWildfireOccurrence / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Wildfire Threshold For Additional Coverage |  | 550,000,000 eix_WildfireThresholdForAdditionalCoverage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation | 112,000,000 eix_AmountOfDamagesDecisionByUsCourtOfFederalClaimsSpentNuclearFuelLitigation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | Amount Returned To Customers |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation |  |  |  |  |  |  | 94,000,000 eix_AmountOfDamagesDecisionByUsCourtOfFederalClaimsSpentNuclearFuelLitigation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_SettlementComponentsAxis = eix_AmountReturnedToCustomersMember |  |  |  |  |
Southern California Edison | Amount Returned To Shareholders |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation |  |  |  |  |  |  | 18,000,000 eix_AmountOfDamagesDecisionByUsCourtOfFederalClaimsSpentNuclearFuelLitigation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_SettlementComponentsAxis = eix_AmountReturnedToShareholdersMember |  |  |  |  |
Southern California Edison | Insurance Claims |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum Deferred Insurance Premium Per Nuclear Incident |  | 255,000,000 eix_MaximumDeferredInsurancePremiumPerNuclearIncident / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Maximum Yearly Assessment Per Nuclear Incident |  | 38,000,000 eix_MaximumYearlyAssessmentPerNuclearIncident / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Limit on Assessment of Retrospective Premium Adjustments, Per Year, Approximate |  | 52,000,000 eix_LimitOnAssessmentOfRetrospectivePremiumAdjustmentsPerYearApproximate / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Southern California Edison | Alleged violations of PSD requirements and New Source Performance Standards of the CAA |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Plaintiffs |  |  |  |  |  |  |  | 4 us-gaap_LossContingencyNumberOfPlaintiffs / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = eix_AllegedViolationsOfPsdRequirementsAndNewSourcePerformanceStandardsOfCaaMember |  |  |  |
Southern California Edison | San Onofre |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period For Rate Recovery |  |  |  |  |  |  |  |  | 10 years |  |  |
Public Utilities, Approved Incentive, Percentage |  | 5.00%eix_PublicUtilitiesApprovedIncentivePercentage / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies (material sites) |  | 70,000,000 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Southern California Edison | San Onofre | Mitsubishi Heavy Industries Ltd |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ratepayer Allocation of Recovery from Recoveries |  | 50.00%eix_RatepayerAllocationofRecoveryfromRecoveries / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = eix_MitsubishiHeavyIndustriesLtdMember |  |  |  |  |  |  |  |  |  |
Entity Allocation of Recovery from Recoveries (under accidental outage insurance) |  | 50.00%eix_EntityAllocationofRecoveryfromRecoveries / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = eix_MitsubishiHeavyIndustriesLtdMember |  |  |  |  |  |  |  |  |  |
Ratepayer Allocation of Recovery from Recoveries, Initial Amount of Settlement |  | 282,000,000 eix_RatepayerAllocationofRecoveryfromRecoveriesInitialAmountofSettlement / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = eix_MitsubishiHeavyIndustriesLtdMember |  |  |  |  |  |  |  |  |  |
Southern California Edison | San Onofre | Insurance Claims |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  | 339,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |
Reduction in Policy Benefits Following Retirement of Assets (under accidental outrage insurance) |  | 90.00%eix_ReductioninPolicyBenefitsFollowingRetirementofAssets / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Ratepayer Allocation of Recovery from Recoveries |  | 95.00%eix_RatepayerAllocationofRecoveryfromRecoveries / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Entity Allocation of Recovery from Recoveries (under accidental outage insurance) |  | 5.00%eix_EntityAllocationofRecoveryfromRecoveries / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Southern California Edison | San Onofre | Other Insurance Claims |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ratepayer Allocation of Recovery from Recoveries |  | 82.50%eix_RatepayerAllocationofRecoveryfromRecoveries / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = eix_OtherInsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Entity Allocation of Recovery from Recoveries (under accidental outage insurance) |  | 17.50%eix_EntityAllocationofRecoveryfromRecoveries / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = eix_OtherInsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Southern California Edison | San Onofre |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual Contribution to Environmental Remediation Study |  | 4,000,000 eix_AnnualContributiontoEnvironmentalRemediationStudy / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_SanOnofreMember |  |  |  |  |  |  |  |  |  |
Period of Environmental Remediation Study Contribution |  | 5 years |  |  |  |  |  |  |  |  |  |
Southern California Edison | Replacement Steam Generators | San Onofre |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incremental Inspection and Repair Costs |  |  |  |  |  | 99,000,000 eix_IncrementalInspectionandRepairCosts / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = eix_ReplacementSteamGeneratorsMember |  |  |  |  |  |
Warranty Period |  | 20 years |  |  |  |  |  |  |  |  |  |
SCE And Other Owners Of San Onofre And Palo Verde | Insurance Claims |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Private Primary Insurance Purchased |  | 375,000,000 eix_PrivatePrimaryInsurancePurchased / dei_LegalEntityAxis = eix_SceAndOtherOwnersOfSanOnofreAndPaloVerdeMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
SCE And Other Owners Of San Onofre And Palo Verde | Tort Claims For Onsite Workers |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Private Primary Insurance Purchased |  | 375,000,000 eix_PrivatePrimaryInsurancePurchased / dei_LegalEntityAxis = eix_SceAndOtherOwnersOfSanOnofreAndPaloVerdeMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = eix_TortClaimsForOnsiteWorkersMember |  |  |  |  |  |  |  |  |  |
SCE And Other Owners Of San Onofre And Palo Verde | San Onofre and Palo Verde | Insurance Claims |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Limit, Property Damage Insurance, Federal Minimum Requirement |  | 1,060,000,000 eix_LossLimitPropertyDamageInsuranceFederalMinimumRequirement / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreAndPaloVerdeMember / dei_LegalEntityAxis = eix_SceAndOtherOwnersOfSanOnofreAndPaloVerdeMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember |  |  |  |  |  |  |  |  |  |
Edison International |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Material Sites Identified for Environmental Remediation |  | 20 eix_NumberOfSitesIdentifiedForEnvironmentalRemediation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |
Minimum costs to be Identified Material Site |  | 1,000,000 eix_MinimumCostsToBeIdentifiedSite / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |
Mitsubishi Heavy Industries Ltd | San Onofre |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum Liability Per Purchase Agreement for Damages |  | 138,000,000 eix_MaximumLiabilityPerPurchaseAgreementForDamages / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_MitsubishiHeavyIndustriesLtdMember |  |  |  |  |  |  |  |  |  |
Loss Contingency Counter Claim Amount |  |  |  |  |  |  |  |  |  | 41,000,000 eix_LossContingencyCounterClaimAmount / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_MitsubishiHeavyIndustriesLtdMember |  |
Mitsubishi Heavy Industries Ltd | Southern California Edison | San Onofre |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  | 4,000,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_CounterpartyNameAxis = eix_MitsubishiHeavyIndustriesLtdMember / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Number of Invoices for Reimbursement |  | 7 eix_NumberOfInvoicesForReimbursement / us-gaap_CounterpartyNameAxis = eix_MitsubishiHeavyIndustriesLtdMember / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Gain Contingency, Invoiced Amount for Reimbursement |  | 149,000,000 eix_GainContingencyInvoicedAmountForReimbursement / us-gaap_CounterpartyNameAxis = eix_MitsubishiHeavyIndustriesLtdMember / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Gain Contingency, Invoiced Amount Paid for Reimbursement |  | 45,000,000 eix_GainContingencyInvoicedAmountPaidForReimbursement / us-gaap_CounterpartyNameAxis = eix_MitsubishiHeavyIndustriesLtdMember / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |
Public Utilities, Incremental Inspection and Repair Costs, Payments from Third Party |  |  |  |  |  | $ 35,000,000 eix_PublicUtilitiesIncrementalInspectionAndRepairCostsPaymentsFromThirdParty / us-gaap_CounterpartyNameAxis = eix_MitsubishiHeavyIndustriesLtdMember / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |

X
- Definition Additional Coverage for Certain Wildfire Liabilities + References No definition available. + Details
Name: | eix_AdditionalCoverageforCertainWildfireLiabilities
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of damages in decision by United States Court of Federal Claims, subject to appeal, regarding spent nuclear fuel. + References No definition available. + Details
Name: | eix_AmountOfDamagesDecisionByUsCourtOfFederalClaimsSpentNuclearFuelLitigation
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The potential estimated cleanup costs for identified material sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. + References No definition available. + Details
Name: | eix_AmountThatCleanupCostsForIdentifiedMaterialSitesCouldExceedRecordedLiability
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The potential estimated cleanup costs for immaterial sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. + References No definition available. + Details
Name: | eix_AmountThatCleanupCostsForImmaterialSitesCouldExceedRecordedLiability
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Annual Contribution to Environmental Remediation Study + References No definition available. + Details
Name: | eix_AnnualContributiontoEnvironmentalRemediationStudy
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Entity Allocation of Recovery from Recoveries + References No definition available. + Details
Name: | eix_EntityAllocationofRecoveryfromRecoveries
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The high end of the range of expected remediation costs in each of the next several years. + References No definition available. + Details
Name: | eix_ExpectedAnnualEnvironmentalRemediationCostsHighEndOfRange
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The low end of the range of expected remediation costs in each of the next several years. + References No definition available. + Details
Name: | eix_ExpectedAnnualEnvironmentalRemediationCostsLowEndOfRange
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expected Annual Environmental Remediation Costs, Period for Cost Estimates + References No definition available. + Details
Name: | eix_ExpectedAnnualEnvironmentalRemediationCostsPeriodforCostEstimates
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The approximate maximum amount of public liability, as limited by federal law, resulting from a nuclear incident. + References No definition available. + Details
Name: | eix_FederalLimitOnPublicLiabilityClaimsFromNuclearIncidentApproximate
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain Contingency, Invoiced Amount for Reimbursement + References No definition available. + Details
Name: | eix_GainContingencyInvoicedAmountForReimbursement
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gain Contingency, Invoiced Amount Paid for Reimbursement + References No definition available. + Details
Name: | eix_GainContingencyInvoicedAmountPaidForReimbursement
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the increase in self insurance retention per wildfire occurrence. + References No definition available. + Details
Name: | eix_IncreaseInSelfInsuranceRetentionPerWildfireOccurrence
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Incremental Inspection and Repair Costs + References No definition available. + Details
Name: | eix_IncrementalInspectionandRepairCosts
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the insurance coverage limit for wildfire liabilities. + References No definition available. + Details
Name: | eix_InsuranceCoverageForWildfireLiabilitiesLimit
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The approximate maximum yearly retrospective premium adjustments that could be assessed against the entity. + References No definition available. + Details
Name: | eix_LimitOnAssessmentOfRetrospectivePremiumAdjustmentsPerYearApproximate
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loss Contingency Counter Claim Amount + References No definition available. + Details
Name: | eix_LossContingencyCounterClaimAmount
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss Limit, Property Damage Insurance, Federal Minimum Requirement + References No definition available. + Details
Name: | eix_LossLimitPropertyDamageInsuranceFederalMinimumRequirement
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The maximum amount of deferred insurance premium based on each nuclear incident occurring. + References No definition available. + Details
Name: | eix_MaximumDeferredInsurancePremiumPerNuclearIncident
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum Expected Period for Clean Up of Identified Sites + References No definition available. + Details
Name: | eix_MaximumExpectedPeriodForCleanUpOfIdentifiedSites
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum aggregate potential liability under the purchase agreement for damages and other amounts in connection with environmental liabilities. + References No definition available. + Details
Name: | eix_MaximumLiabilityPerPurchaseAgreementForDamages
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of additional insurance premium per yearly assessment charged for each nuclear incident. + References No definition available. + Details
Name: | eix_MaximumYearlyAssessmentPerNuclearIncident
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The upper end of the range of a site's cost estimate must be at least this amount to be classified as a material identified site. Below this amount an identified site will be an immaterial site. + References No definition available. + Details
Name: | eix_MinimumCostsToBeIdentifiedSite
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of immaterial identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. + References No definition available. + Details
Name: | eix_NumberOfImmaterialSitesForEnvironmentalRemediation
Namespace Prefix: | eix_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Invoices for Reimbursement + References No definition available. + Details
Name: | eix_NumberOfInvoicesForReimbursement
Namespace Prefix: | eix_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of material identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. + References No definition available. + Details
Name: | eix_NumberOfSitesIdentifiedForEnvironmentalRemediation
Namespace Prefix: | eix_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of environmental remediation costs entity will recover through incentive mechanism. + References No definition available. + Details
Name: | eix_PercentageOfEnvironmentalRemediationCostsRecoverableFromIncentiveMechanism
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of environmental remediation costs to be recovered. + References No definition available. + Details
Name: | eix_PercentageOfEnvironmentalRemediationCostsToBeRecovered
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period For Rate Recovery + References No definition available. + Details
Name: | eix_PeriodForRateRecovery
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of Environmental Remediation Study Contribution + References No definition available. + Details
Name: | eix_PeriodofEnvironmentalRemediationStudyContribution
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of the recorded liability for environmental remediation costs recoverable through incentive mechanism. + References No definition available. + Details
Name: | eix_PortionOfRecordedLiabilityRecoverableFromIncentiveMechanism
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The maximum amount of private primary insurance available, which was purchased. + References No definition available. + Details
Name: | eix_PrivatePrimaryInsurancePurchased
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Incentive that allows to retain 5% of sales proceeds and recover 5% of excess of cancelled contract obligations over cancellation costs. + References No definition available. + Details
Name: | eix_PublicUtilitiesApprovedIncentivePercentage
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Incremental Inspection and Repair Costs, Payments from Third Party + References No definition available. + Details
Name: | eix_PublicUtilitiesIncrementalInspectionAndRepairCostsPaymentsFromThirdParty
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Ratepayer Allocation of Recovery from Recoveries + References No definition available. + Details
Name: | eix_RatepayerAllocationofRecoveryfromRecoveries
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratepayer Allocation of Recovery from Recoveries, Initial Amount of Settlement + References No definition available. + Details
Name: | eix_RatepayerAllocationofRecoveryfromRecoveriesInitialAmountofSettlement
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the recorded liability incurred at majority of the remaining sites through customer rates. + References No definition available. + Details
Name: | eix_RecordedLiabilityIncurredAtMajorityOfRemainingSitesThroughCustomerRates
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reduction in Policy Benefits Following Retirement of Assets + References No definition available. + Details
Name: | eix_ReductioninPolicyBenefitsFollowingRetirementofAssets
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Assets, Noncurrent, Environmental Remediation + References No definition available. + Details
Name: | eix_RegulatoryAssetsNoncurrentEnvironmentalRemediation
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Warranty Period + References No definition available. + Details
Name: | eix_WarrantyPeriod
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Wildfire Threshold For Additional Coverage + References No definition available. + Details
Name: | eix_WildfireThresholdForAdditionalCoverage
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 + Details
Name: | us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
Name: | us-gaap_EnvironmentalRemediationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated minimum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossMinimum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=eix_MitsubishiHeavyIndustriesLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=eix_SceAndOtherOwnersOfSanOnofreAndPaloVerdeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=eix_MitsubishiHeavyIndustriesLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=eix_SanOnofreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_InsuranceClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |