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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value $ 10,738us-gaap_LongTermDebt $ 10,426us-gaap_LongTermDebt
Fair Value 12,319us-gaap_LongTermDebtFairValue 11,084us-gaap_LongTermDebtFairValue
Southern California Edison    
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value 9,924us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
10,022us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Fair Value $ 11,479us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
$ 10,656us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember