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Summary of Significant Accounting Policies (Revision to Cash Flow) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Nuclear decommissioning trusts |  | $ 76 eix_RegulatoryImpactOfNetNuclearDecommissioningTrustEarningsReflectedInAccumulatedDepreciation |
Total cash provided (used) by operating activities | 3,248 us-gaap_NetCashProvidedByUsedInOperatingActivities | 2,967 us-gaap_NetCashProvidedByUsedInOperatingActivities | 3,334 us-gaap_NetCashProvidedByUsedInOperatingActivities
Purchases of nuclear decommissioning trust investments | (10,123)us-gaap_PaymentsToInvestInDecommissioningFund | (5,715)us-gaap_PaymentsToInvestInDecommissioningFund | (2,337)us-gaap_PaymentsToInvestInDecommissioningFund
Total cash used by investing activities | (3,907)us-gaap_NetCashProvidedByUsedInInvestingActivities | (3,572)us-gaap_NetCashProvidedByUsedInInvestingActivities | (5,283)us-gaap_NetCashProvidedByUsedInInvestingActivities
Scenario, Previously Reported |  |  |
Nuclear decommissioning trusts |  | 312 eix_RegulatoryImpactOfNetNuclearDecommissioningTrustEarningsReflectedInAccumulatedDepreciation / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Total cash provided (used) by operating activities |  | 3,203 us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Purchases of nuclear decommissioning trust investments |  | (5,951)us-gaap_PaymentsToInvestInDecommissioningFund / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Total cash used by investing activities |  | (3,808)us-gaap_NetCashProvidedByUsedInInvestingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Restatement Adjustment |  |  |
Nuclear decommissioning trusts |  | (236)eix_RegulatoryImpactOfNetNuclearDecommissioningTrustEarningsReflectedInAccumulatedDepreciation / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Total cash provided (used) by operating activities |  | (236)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Purchases of nuclear decommissioning trust investments |  | 236 us-gaap_PaymentsToInvestInDecommissioningFund / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Total cash used by investing activities |  | 236 us-gaap_NetCashProvidedByUsedInInvestingActivities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Southern California Edison |  |  |
Nuclear decommissioning trusts |  | 76 eix_RegulatoryImpactOfNetNuclearDecommissioningTrustEarningsReflectedInAccumulatedDepreciation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Total cash provided (used) by operating activities | 3,660 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 3,048 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 4,086 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Purchases of nuclear decommissioning trust investments | (10,123)us-gaap_PaymentsToInvestInDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | (5,715)us-gaap_PaymentsToInvestInDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | (2,337)us-gaap_PaymentsToInvestInDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total cash used by investing activities | (3,857)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | (3,547)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | (4,354)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | Scenario, Previously Reported |  |  |
Nuclear decommissioning trusts |  | 312 eix_RegulatoryImpactOfNetNuclearDecommissioningTrustEarningsReflectedInAccumulatedDepreciation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Total cash provided (used) by operating activities |  | 3,284 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Purchases of nuclear decommissioning trust investments |  | (5,951)us-gaap_PaymentsToInvestInDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Total cash used by investing activities |  | (3,783)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Southern California Edison | Restatement Adjustment |  |  |
Nuclear decommissioning trusts |  | (236)eix_RegulatoryImpactOfNetNuclearDecommissioningTrustEarningsReflectedInAccumulatedDepreciation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Total cash provided (used) by operating activities |  | (236)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Purchases of nuclear decommissioning trust investments |  | 236 us-gaap_PaymentsToInvestInDecommissioningFund / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Total cash used by investing activities |  | $ 236 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |

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- Definition The regulatory impacts of the realized gains and losses and earnings associated with the nuclear decommissioning trust investments reflected in proceeds and purchases of nuclear decommissioning trust investments in investing activities. + References No definition available. + Details
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