XML 112 R85.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) (Postretirement Benefits Other Than Pensions, USD $) In Millions, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 2,086 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  | 2,065 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  | $ 1,800 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Private bond |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Target asset allocation percentage of US equity securities | 4.00%eix_DefinedBenefitPlanTargetAllocationPercentageOfAssetsUsEquitySecurities / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_PrivateBondMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 6.00%eix_DefinedBenefitPlanTargetAllocationPercentageOfAssetsUsEquitySecurities / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_PrivateBondMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Undervalued Securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Target asset allocation percentage of US equity securities | 17.00%eix_DefinedBenefitPlanTargetAllocationPercentageOfAssetsUsEquitySecurities / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_UndervaluedSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 7.00%eix_DefinedBenefitPlanTargetAllocationPercentageOfAssetsUsEquitySecurities / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_UndervaluedSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Collateralized mortgage obligations and other asset backed securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Receivables and payables, net | 31 eix_DefinedBenefitPlanFairValueOfPlanAssetsReceivablesAndPayablesNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CollateralizedMortgageObligationsAndOtherAssetBackedSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 29 eix_DefinedBenefitPlanFairValueOfPlanAssetsReceivablesAndPayablesNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CollateralizedMortgageObligationsAndOtherAssetBackedSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Municipal Notes |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 111 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MunicipalNotesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 76 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MunicipalNotesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Russell 200 and Russell 1000 indexes | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 47.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_RussellIndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 50.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_RussellIndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Russell 1000 index | Common or collective equity funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 38.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_Russell1000IndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CommonOrCollectiveEquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 60.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_Russell1000IndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CommonOrCollectiveEquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Morgan Stanley Capital International Europe Australasia And Far East Index | Equity index fund |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 41.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_MorganStanleyCapitalInternationalEuropeAustralasiaAndFarEastIndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_EquityIndexFundMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 23.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_MorganStanleyCapitalInternationalEuropeAustralasiaAndFarEastIndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_EquityIndexFundMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
MSCI All Country World Index | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Performance percentage benchmark | 53.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_MsciAllCountryWorldIndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | 50.00%eix_PerformancePercentageBenchmark / eix_DefinedBenefitPlanByIndexCategoriesAxis = eix_MsciAllCountryWorldIndexMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Level 3 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets | 105 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 164 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 166 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Asset backed securities including distressed mortgages |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actual plan asset allocations | 50.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_AssetBackedSecuritiesIncludingDistressedMortgagesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 78.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_AssetBackedSecuritiesIncludingDistressedMortgagesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Southern California Edison |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 2,159 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,063 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Receivables and payables, net | (73)eix_DefinedBenefitPlanFairValueOfPlanAssetsReceivablesAndPayablesNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2 eix_DefinedBenefitPlanFairValueOfPlanAssetsReceivablesAndPayablesNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Fair Value of Plan Assets | 2,086 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,065 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,800 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | Common/collective funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 431 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CommonOrCollectiveFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] | 863 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CommonOrCollectiveFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] |
Southern California Edison | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 250 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 451 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] |
Southern California Edison | Corporate notes and bonds securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 883 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CorporateNotesAndBondsSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [3] | 250 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CorporateNotesAndBondsSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [3] |
Southern California Edison | Partnerships/joint ventures |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 124 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_PartnershipsJointVenturesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [4] | 184 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_PartnershipsJointVenturesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [4] |
Southern California Edison | U.S. government and agency securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 243 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [5] | 154 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [5] |
Southern California Edison | Registered investment companies |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 69 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsGlobalOpportunityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [6] | 57 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsGlobalOpportunityMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [6] |
Southern California Edison | Interest bearing cash |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 29 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_InterestBearingDepositsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 19 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_InterestBearingDepositsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Southern California Edison | Other |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 130 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_OthersInvestmentCategoriesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [7] | 85 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_OthersInvestmentCategoriesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [7] |
Southern California Edison | Level 1 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 555 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 647 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Southern California Edison | Level 1 | Common/collective funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CommonOrCollectiveFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] | 0 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CommonOrCollectiveFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] |
Southern California Edison | Level 1 | Corporate stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 250 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 451 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] |
Southern California Edison | Level 1 | Corporate notes and bonds securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CorporateNotesAndBondsSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [3] | 0 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_CorporateNotesAndBondsSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [3] |
Southern California Edison | Level 1 | Partnerships/joint ventures |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 0 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_PartnershipsJointVenturesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [4] | 0 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = eix_PartnershipsJointVenturesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [4] |
Southern California Edison | Level 1 | U.S. government and agency securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Fair Value of Plan Assets, Gross | 207 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [5] | 118 eix_DefinedBenefitPlanFairValueOfPlanAssetsGross / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [5] |
Southern California Edison | Level 1 | Registered investment companies |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
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Southern California Edison | Level 1 | Interest bearing cash |  |  |  |  |
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Southern California Edison | Level 1 | Other |  |  |  |  |
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Southern California Edison | Level 2 |  |  |  |  |
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Southern California Edison | Level 2 | Common/collective funds |  |  |  |  |
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Southern California Edison | Level 2 | Corporate stocks |  |  |  |  |
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Southern California Edison | Level 2 | Corporate notes and bonds securities |  |  |  |  |
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Southern California Edison | Level 2 | Partnerships/joint ventures |  |  |  |  |
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Southern California Edison | Level 2 | U.S. government and agency securities |  |  |  |  |
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Southern California Edison | Level 2 | Registered investment companies |  |  |  |  |
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Southern California Edison | Level 2 | Interest bearing cash |  |  |  |  |
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Southern California Edison | Level 2 | Other |  |  |  |  |
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Southern California Edison | Level 3 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
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Southern California Edison | Level 3 | Common/collective funds |  |  |  |  |
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Southern California Edison | Level 3 | Corporate stocks |  |  |  |  |
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Southern California Edison | Level 3 | Corporate notes and bonds securities |  |  |  |  |
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Southern California Edison | Level 3 | Partnerships/joint ventures |  |  |  |  |
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Southern California Edison | Level 3 | U.S. government and agency securities |  |  |  |  |
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Southern California Edison | Level 3 | Registered investment companies |  |  |  |  |
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Southern California Edison | Level 3 | Interest bearing cash |  |  |  |  |
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Southern California Edison | Level 3 | Other |  |  |  |  |
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[1] | At December 31, 2014 and 2013, respectively, 38% and 60% of the common/collective assets are invested in a large cap index fund which seeks to track performance of the Russell 1000 index. 41% and 23% of the assets in this category are in index funds which seek to track performance in the MSCI Europe, Australasia and Far East (EAFE) Index. 4% and 6% of this category are invested in a privately managed bond fund and 17% and 7% in a fund which invests in equity securities the fund manager believes are undervalue
[2] | Corporate stock performance is primarily benchmarked against the Russell Indexes (47% and 50%) and the MSCI All Country World (ACWI) index (53% and 50%) for 2014 and 2013, respectivel
[3] | Corporate notes and bonds are diversified and include approximately $31 million and $29 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2014 and 2013, respectively.
[4] | At December 31, 2014 and 2013, respectively, 50% and 78% of the Level 3 partnerships category is invested in (1) asset backed securities including distressed mortgages, (2) distressed companies and (3) commercial and residential loans and debt and equity of banks.
[5] | Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association.
[6] | Level 1 registered investment companies consist of an investment grade corporate bond mutual fund and a money market fund.
[7] | Other includes $111 million and $76 million of municipal securities at December 31, 2014 and 2013, respectively.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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