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Compensation and Benefit Plans (Employee Savings Plan) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Contribution Plans [Line Items]      
Employer contributions $ 71us-gaap_DefinedContributionPlanCostRecognized $ 76us-gaap_DefinedContributionPlanCostRecognized $ 85us-gaap_DefinedContributionPlanCostRecognized
Southern California Edison      
Defined Contribution Plans [Line Items]      
Employer contributions $ 70us-gaap_DefinedContributionPlanCostRecognized
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 $ 76us-gaap_DefinedContributionPlanCostRecognized
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 $ 84us-gaap_DefinedContributionPlanCostRecognized
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember