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Regulatory Assets and Liabilities (Details) (USD $) | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Feb. 01, 2012 | Dec. 31, 2013
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  | $ 1,254,000,000 us-gaap_RegulatoryAssetsCurrent |  | $ 538,000,000 us-gaap_RegulatoryAssetsCurrent
Regulatory Asset, Long-term |  | 7,612,000,000 us-gaap_RegulatoryAssetsNoncurrent |  | 7,241,000,000 us-gaap_RegulatoryAssetsNoncurrent
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  | 401,000,000 us-gaap_RegulatoryLiabilityCurrent |  | 767,000,000 us-gaap_RegulatoryLiabilityCurrent
Regulatory Liabilities, Long-term |  | 5,889,000,000 us-gaap_RegulatoryLiabilityNoncurrent |  | 4,995,000,000 us-gaap_RegulatoryLiabilityNoncurrent
Scenario, Forecast | California Public Utilities Commission |  |  |  |
Regulatory Liabilities |  |  |  |
Cost Recovery Balancing Account Revenue Requirement | 5,590,000,000 eix_CostRecoveryBalancingAccountRevenueRequirement / us-gaap_RegulatoryAgencyAxis = eix_CaliforniaPublicUtilitiesCommissionMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |
Increase (Decrease) in Annual Cost Recovery Balancing Account Revenue Requirement | 437,000,000 eix_IncreaseDecreaseinAnnualCostRecoveryBalancingAccountRevenueRequirement / us-gaap_RegulatoryAgencyAxis = eix_CaliforniaPublicUtilitiesCommissionMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |
Southern California Edison |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Regulatory assets, energy derivatives, low range of contract expiration (in years) |  | 1 year |  |
Regulatory assets, energy derivatives, high range of contract expiration (in years) |  | 45 years |  |
Regulatory assets related to deferred income taxes, recovery period, low range (in years) |  | 1 year |  |
Regulatory assets related to deferred income taxes, recovery period, high range (in years) |  | 50 years |  |
Low end of the range of remaining original amortization (in years) |  | 1 year |  |
High end of the range of remaining original amortization (in years) |  | 35 years |  |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  | 1,254,000,000 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 538,000,000 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Regulatory Asset, Long-term |  | 7,612,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 7,241,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total Regulatory Assets |  | 8,866,000,000 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 7,779,000,000 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  | 401,000,000 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 767,000,000 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Regulatory Liabilities, Long-term |  | 5,889,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 4,995,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total Regulatory Liabilities |  | 6,290,000,000 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 5,762,000,000 us-gaap_RegulatoryLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | FERC-Approved Settlement Agreements |  |  |  |
Regulatory Liabilities |  |  |  |
Litigation Settlement, Amount |  | 219,000,000 us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LitigationCaseAxis = eix_FERCApprovedSettlementAgreementsMember |  |
Litigation Settlement, Amount Subject to Shareholder Incentive |  | 15,000,000 eix_LitigationSettlementAmountSubjecttoShareholderIncentive / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_LitigationCaseAxis = eix_FERCApprovedSettlementAgreementsMember |  |
Southern California Edison | Regulatory balancing accounts |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  | 1,088,000,000 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember |  | 484,000,000 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Regulatory Asset, Long-term |  | 44,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember |  | 818,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Southern California Edison | Energy derivatives |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  | 159,000,000 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |  | 54,000,000 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Regulatory Asset, Long-term |  | 850,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember |  | 816,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Southern California Edison | Other |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  | 7,000,000 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember |  | 0 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember
Regulatory Asset, Long-term |  | 351,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember |  | 402,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  | 21,000,000 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember |  | 43,000,000 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember
Regulatory Liabilities, Long-term |  | 24,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember |  | 12,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_OtherRegulatedAssetsOrLiabilitiesMember
Southern California Edison | Deferred income taxes, net |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  | 3,405,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_DeferredIncomeTaxChargesMember |  | 2,957,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_DeferredIncomeTaxChargesMember
Southern California Edison | Pensions and other postretirement benefits |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  | 1,218,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_PensionsAndOtherPostretirementBenefitsMember |  | 369,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_PensionsAndOtherPostretirementBenefitsMember
Southern California Edison | Unamortized investments, net |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Return rate earned on assets included in rate base (as a percent) |  | 7.90%eix_ReturnRateEarnedOnAssetsIncludedInRateBase / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_GenerationInvestmentMember |  | 7.90%eix_ReturnRateEarnedOnAssetsIncludedInRateBase / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_GenerationInvestmentMember
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  | 255,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_GenerationInvestmentMember |  | 332,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_GenerationInvestmentMember
Southern California Edison | San Onofre |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  | 1,288,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_SanOnofreMember |  | 1,325,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_SanOnofreMember
Southern California Edison | Unamortized loss on reacquired debt |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  | 201,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_LossOnReacquiredDebtMember |  | 222,000,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_LossOnReacquiredDebtMember
Southern California Edison | Regulatory balancing accounts |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  | 380,000,000 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember |  | 724,000,000 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Regulatory Liabilities, Long-term |  | 1,083,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember |  | 1,132,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Southern California Edison | Costs of removal |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Long-term |  | 2,826,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_CostOfRemovalMember |  | 2,780,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_CostOfRemovalMember
Southern California Edison | Recoveries in excess of ARO Liabilities1 |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Long-term |  | $ 1,956,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_AssetRetirementObligationCostsMember |  | $ 1,071,000,000 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_AssetRetirementObligationCostsMember
Legacy Meters | Southern California Edison | Unamortized investments, net |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Return rate earned on assets included in rate base (as a percent) |  | 6.46%eix_ReturnRateEarnedOnAssetsIncludedInRateBase / us-gaap_JointlyOwnedUtilityPlantAxis = eix_LegacyMetersMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_GenerationInvestmentMember |  | 6.46%eix_ReturnRateEarnedOnAssetsIncludedInRateBase / us-gaap_JointlyOwnedUtilityPlantAxis = eix_LegacyMetersMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = eix_GenerationInvestmentMember
San Onofre | Southern California Edison |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Return rate earned on assets included in rate base (as a percent) |  | 2.62%eix_ReturnRateEarnedOnAssetsIncludedInRateBase / us-gaap_JointlyOwnedUtilityPlantAxis = eix_SanOnofreMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Period For Rate Recovery |  |  | 10 years |

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- Definition Litigation Settlement, Amount Subject to Shareholder Incentive + References No definition available. + Details
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- Definition Regulatory assets, energy derivative contracts, high range of expiration + References No definition available. + Details
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- Definition Regulatory Noncurrent Asset, Amortization Period, High End of Range + References No definition available. + Details
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- Definition This element represents the return rate earned on assets included in rate base. + References No definition available. + Details
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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