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Compensation and Benefit Plans (Workforce Reduction) (Details) (Employee Severance, Southern California Edison, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Employee Severance | Southern California Edison
  
Restructuring Reserve [Roll Forward]  
Balance at January 1, 2014 $ 54us-gaap_RestructuringReserve
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Additions 3us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Payments (22)us-gaap_PaymentsForRestructuring
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Balance at December 31, 2014 $ 35us-gaap_RestructuringReserve
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember