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v2.4.1.9

Variable Interest Entities (Details) (Southern California Edison, USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013
Series G Preferred Stock |  |  |
Unconsolidated Trust |  |  |
Security dividend rate, (as a percent) | 5.10%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  |
5.75% Series H (cumulative) |  |  |
Unconsolidated Trust |  |  |
Security dividend rate, (as a percent) | 5.75%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember |  |
Series F Preferred Stock |  |  |
Unconsolidated Trust |  |  |
Security dividend rate, (as a percent) | 5.625%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  |
Trust I | Trust Securities |  |  |
Unconsolidated Trust |  |  |
Security dividend rate, (as a percent) |  | 5.625%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember |
Liquidation value (in dollars per share) |  | $ 25 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember |
Common stock | 10,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | $ 10,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | $ 10,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember
Trust I | Series F Preferred Stock |  |  |
Unconsolidated Trust |  |  |
Liquidation preference | 475,000,000 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | 475,000,000 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | 475,000,000 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember
Liquidation value (in dollars per share) |  | $ 2,500 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember |
Trust II | Trust Securities |  |  |
Unconsolidated Trust |  |  |
Security dividend rate, (as a percent) |  |  | 5.10%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember
Liquidation value (in dollars per share) |  |  | $ 25 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember
Common stock | 10,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember |  | 10,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember
Trust II | Series G Preferred Stock |  |  |
Unconsolidated Trust |  |  |
Liquidation preference | 400,000,000 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember |  | 400,000,000 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember
Liquidation value (in dollars per share) |  |  | $ 2,500 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember
Trust III | Trust Securities |  |  |
Unconsolidated Trust |  |  |
Security dividend rate, (as a percent) | 5.75%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIIIMember |  |
Liquidation value (in dollars per share) | 25 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIIIMember |  |
Common stock | 10,000 us-gaap_CommonStockValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = eix_TrustSecuritiesMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIIIMember |  |
Trust III | 5.75% Series H (cumulative) |  |  |
Unconsolidated Trust |  |  |
Liquidation preference | 275,000,000 us-gaap_PreferredStockLiquidationPreferenceValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIIIMember |  |
Liquidation value (in dollars per share) | 2,500 us-gaap_PreferredStockLiquidationPreference / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesHPreferredStockMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIIIMember |  |
Variable Interest Entity, Not Primary Beneficiary | SCE Power Purchase Contracts |  |  |
Details of projects or entities |  |  |
Power generating capacity for majority interest (in megawatts) | 5,641 eix_PowerGeneratingCapacityOfProjectsOwnedControlled / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_ScePowerPurchaseContractsMember |  | 5,183 eix_PowerGeneratingCapacityOfProjectsOwnedControlled / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_ScePowerPurchaseContractsMember
Payments to unconsolidated VIEs for power purchase contracts | 739,000,000 eix_PaymentsToUnconsolidatedViesPowerPurchaseContracts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_ScePowerPurchaseContractsMember |  | $ 715,000,000 eix_PaymentsToUnconsolidatedViesPowerPurchaseContracts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_ScePowerPurchaseContractsMember

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- Definition Payments for electricity purchased during the reporting period under power purchase contracts with unconsolidated VIEs. + References No definition available. + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + 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 210.5-02.29) -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 30 -Article 5 + Details
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