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Summary of Significant Accounting Policies (Cash) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents Items [Line Items]    
Maximum maturity period of cash equivalent investments (in months) 3 months  
Money market funds $ 35us-gaap_MoneyMarketFundsAtCarryingValue $ 35us-gaap_MoneyMarketFundsAtCarryingValue
Book balances reclassified to accounts payable 121eix_CashReclassifiedToAccountsPayable 180eix_CashReclassifiedToAccountsPayable
Southern California Edison    
Cash and Cash Equivalents Items [Line Items]    
Money market funds 5us-gaap_MoneyMarketFundsAtCarryingValue
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 5us-gaap_MoneyMarketFundsAtCarryingValue
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Book balances reclassified to accounts payable $ 121eix_CashReclassifiedToAccountsPayable
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 $ 177eix_CashReclassifiedToAccountsPayable
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember