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Derivative Instruments (Notional Values) (Details) (Southern California Edison, Electric Utility, Gross amounts recognized) | Dec. 31, 2014 MWh | Dec. 31, 2013 MWh
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Electricity options, swaps and forwards (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 4,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_ElectricityOptionsSwapsAndForwardArrangementsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | 6,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_ElectricityOptionsSwapsAndForwardArrangementsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember
Natural gas options, swaps and forwards (Bcf) |  |
Derivatives |  |
Notional volumes of derivative instruments | 0 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_NaturalGasOptionsSwapsAndForwardsArrangementBcfMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | 0 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_NaturalGasOptionsSwapsAndForwardsArrangementBcfMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember
Congestion revenue rights (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 123,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | 149,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember
Tolling arrangements (GWh) |  |
Derivatives |  |
Notional volumes of derivative instruments | 80,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_TollingArrangementsGwhMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | 88,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = eix_TollingArrangementsGwhMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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