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Commitments and Contingencies (Commitments Textual) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 24, 2015
Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Operating Leases, Rent Expense | $ 96,000,000 us-gaap_LeaseAndRentalExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 78,000,000 us-gaap_LeaseAndRentalExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 75,000,000 us-gaap_LeaseAndRentalExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Renewable Energy Contracts | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Number of Renewable Energy Contracts | 168 eix_NumberOfRenewableEnergyContracts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember |  |  |  |
Unrecorded Unconditional Purchase Obligation | 23,399,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember |  |  |  |
Qualifying Facility Power Purchase Agreements | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Agreements with Number of Qualifying Small Power Production Facilities | 130 eix_AgreementsWithNumberOfQualifyingSmallPowerProductionFacilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember |  |  |  |
Unrecorded Unconditional Purchase Obligation | 969,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember |  |  |  |
Combined Heat and Power Contracts | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Number of Combined Heat and Power Contracts | 11 eix_NumberOfCombinedHeatAndPowerContracts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_CombinedHeatAndPowerContractsMember |  |  |  |
Other Power Purchase Agreements | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Number of Tolling Arrangements | 11 eix_NumberOfTollingArrangements / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember |  |  |  |
Number of transmission contracts | 11 eix_NumberOfPowerCallOptions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember |  |  |  |
Number of Resource Adequacy Contracts | 13 eix_NumberOfResourceAdequacyContracts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember |  |  |  |
Unrecorded Unconditional Purchase Obligation | 4,875,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember |  |  |  |
Other Contractual Obligations | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Long Term Purchase Commitment Cost Incurred | 90,000,000 eix_LongTermPurchaseCommitmentCostIncurred / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember | 153,000,000 eix_LongTermPurchaseCommitmentCostIncurred / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember | 249,000,000 eix_LongTermPurchaseCommitmentCostIncurred / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember |  |
Operating Leases Purchase Power Contracts | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Operating Leases, Rent Expense, Net | 1,700,000,000 us-gaap_OperatingLeasesRentExpenseNet / eix_LeasesByTypeAxis = eix_OperatingLeasesPurchasePowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 1,500,000,000 us-gaap_OperatingLeasesRentExpenseNet / eix_LeasesByTypeAxis = eix_OperatingLeasesPurchasePowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 1,300,000,000 us-gaap_OperatingLeasesRentExpenseNet / eix_LeasesByTypeAxis = eix_OperatingLeasesPurchasePowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Operating Leases, Rent Expense, Contingent Rentals | 944,000,000 us-gaap_OperatingLeasesRentExpenseContingentRentals / eix_LeasesByTypeAxis = eix_OperatingLeasesPurchasePowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 843,000,000 us-gaap_OperatingLeasesRentExpenseContingentRentals / eix_LeasesByTypeAxis = eix_OperatingLeasesPurchasePowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 609,000,000 us-gaap_OperatingLeasesRentExpenseContingentRentals / eix_LeasesByTypeAxis = eix_OperatingLeasesPurchasePowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Capital Leases Power Contracts | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Capital Lease Power Purchase Agreement, Net | 203,000,000 eix_CapitalLeasePowerPurchaseAgreementNet / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 209,000,000 eix_CapitalLeasePowerPurchaseAgreementNet / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 46,000,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 39,000,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Capital Leases Future Minimum Payments, Present Value of Net Minimum Payments, Current | 7,000,000 eix_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsCurrent / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 6,000,000 eix_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsCurrent / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Capital Leases Future Minimum Payments, Present Value of Net Minimum Payments, Noncurrent | 196,000,000 eix_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsNoncurrent / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 203,000,000 eix_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPaymentsNoncurrent / eix_LeasesByTypeAxis = eix_CapitalLeasesPowerContractsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Contract Termination |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 28,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ContractTerminationMember |  |  |  |
Subsequent Event | Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation |  |  |  | $ 680,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | [1]
[1] | (in millions)RenewableEnergyContracts QF PowerPurchaseAgreements Other PurchaseAgreements2015$1,009 $254 $83020161,115 217 72420171,162 191 72920181,159 150 59220191,214 88 496Thereafter17,740 69 1,504Total future commitments$23,399 $969 $4,875

X
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- Definition This element represents the carrying amount of net capital leases reflected on the consolidated balance sheets. + References No definition available. + Details
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- Definition The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Rentals -URI http://asc.fasb.org/extlink&oid=6508509 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6452616&loc=d3e36728-112689 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=7579899&loc=d3e35050-112683 + Details
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