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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 MW | Dec. 31, 2013 MW
Congestion revenue rights | Market simulation model |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Fair Value, Assets | 317 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |  | 366 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |
Fair Value, Liabilities | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |  | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |
Tolling | Option model |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Fair Value, Assets | 4 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 5 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Fair Value, Liabilities | 1,207 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 1,175 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Level 3 | Congestion revenue rights | Market simulation model | Load forecast | Minimum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Fair value inputs, power units (in megawatts) | 7,630 eix_FairValueInputsPowerUnits / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_LoadForecastMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |  | 7,603 eix_FairValueInputsPowerUnits / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_LoadForecastMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |
Level 3 | Congestion revenue rights | Market simulation model | Load forecast | Maximum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Fair value inputs, power units (in megawatts) | 25,431 eix_FairValueInputsPowerUnits / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_LoadForecastMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |  | 24,896 eix_FairValueInputsPowerUnits / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_LoadForecastMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |
Level 3 | Congestion revenue rights | Market simulation model | Congestion Prices | Minimum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected prices (in dollars per unit) | 1.65 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_CongestionPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | (9.86)eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_CongestionPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
Level 3 | Congestion revenue rights | Market simulation model | Congestion Prices | Maximum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected prices (in dollars per unit) | 109.95 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_CongestionPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1] | 108.56 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_CongestionPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [1]
Level 3 | Congestion revenue rights | Market simulation model | Gas Prices | Minimum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected prices (in dollars per unit) | 3.65 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [2] | 3.50 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [2]
Level 3 | Congestion revenue rights | Market simulation model | Gas Prices | Maximum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected prices (in dollars per unit) | 6.53 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [2] | 7.10 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_CongestionRevenueRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember | [2]
Level 3 | Tolling | Option model | Gas Prices | Minimum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected volatility rate (as a percent) | 13.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 16.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Level 3 | Tolling | Option model | Gas Prices | Maximum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected volatility rate (as a percent) | 53.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 35.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Level 3 | Tolling | Option model | Gas Prices | Weighted Average |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected volatility rate (as a percent) | 20.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 21.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / eix_UnobservableInputAxis = eix_GasPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Level 3 | Tolling | Option model | Power Prices | Minimum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected volatility rate (as a percent) | 25.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 25.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Expected prices (in dollars per unit) | 30.60 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 38.00 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Level 3 | Tolling | Option model | Power Prices | Maximum |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected volatility rate (as a percent) | 42.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 45.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Expected prices (in dollars per unit) | 61.40 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 63.90 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Level 3 | Tolling | Option model | Power Prices | Weighted Average |  |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |  |
Expected volatility rate (as a percent) | 30.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 30.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
Expected prices (in dollars per unit) | 44.60 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |  | 47.40 eix_FairValueInputsPriceLevel / us-gaap_DerivativeByNatureAxis = eix_TollingMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / eix_UnobservableInputAxis = eix_PowerPricesMember / us-gaap_ValuationTechniqueAxis = eix_OptionModelMember |
[1] | Prices are in dollars per megawatt-hour.
[2] | Prices are in dollars per million British thermal units.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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