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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Discounts and issuance costs of long term debt $ 6eix_PremiumsDiscountsandIssuanceCostsofLongTermDebt $ 18eix_PremiumsDiscountsandIssuanceCostsofLongTermDebt $ 4eix_PremiumsDiscountsandIssuanceCostsofLongTermDebt
Southern California Edison      
Discounts and issuance costs of long term debt $ 2eix_PremiumsDiscountsandIssuanceCostsofLongTermDebt
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 $ 18eix_PremiumsDiscountsandIssuanceCostsofLongTermDebt
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 $ 4eix_PremiumsDiscountsandIssuanceCostsofLongTermDebt
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember