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Accumulated Other Comprehensive Loss (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income    
Beginning balance $ (13)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (87)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other 2eix_OtherAdjustmentNetOfTax 2eix_OtherAdjustmentNetOfTax
Change (45)eix_IncreaseDecreaseinOtherComprehensiveIncome 74eix_IncreaseDecreaseinOtherComprehensiveIncome
Ending balance (58)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (13)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Pension and PBOP – net gain (loss):    
Increase (Decrease) in Accumulated Other Comprehensive Income    
Other comprehensive income (loss) before reclassifications (58)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
63us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
Reclassified from accumulated other comprehensive loss 11us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
[1] 9us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
[1]
Southern California Edison    
Increase (Decrease) in Accumulated Other Comprehensive Income    
Beginning balance (11)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
(29)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Other 2eix_OtherAdjustmentNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
2eix_OtherAdjustmentNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Change (17)eix_IncreaseDecreaseinOtherComprehensiveIncome
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
18eix_IncreaseDecreaseinOtherComprehensiveIncome
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Ending balance (28)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
(11)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | Pension and PBOP – net gain (loss):    
Increase (Decrease) in Accumulated Other Comprehensive Income    
Other comprehensive income (loss) before reclassifications (21)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
13us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
Reclassified from accumulated other comprehensive loss $ 2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
[1] $ 3us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_StatementEquityComponentsAxis
= eix_AccumulatedPriorServiceCostOnPensionAndPostretirementBenefitsOtherThanPensionNetOfTaxMember
[1]
[1] These items are included in the computation of net periodic pension and PBOP expense. See Note 8 for additional information.