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Compensation and Benefit Plans (Performance Share Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Performance Shares Classified As Equity Awards  
Restricted Stock Units  
Beginning balance (number of shares) 156,697us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Granted (number of shares) 61,599us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Forfeited (number of shares) (4,672)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Vested (number of shares) (85,324)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
[1]
Ending balance (number of shares) 128,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Weighted-Average Grant Date Fair Value  
Beginning balance, weighted average grant date fair value (dollars per share) $ 51.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Granted, weighted average grant date fair value (dollars per share) $ 61.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Forfeited, weighted average grant date fair value (dollars per share) $ 54.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Vested, weighted average grant date fair value (dollars per share) $ 51.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
[1]
Ending balance, weighted average grant date fair value (dollars per share) $ 55.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
Performance Shares Classified As Liability Awards  
Restricted Stock Units  
Beginning balance (number of shares) 156,304us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
Granted (number of shares) 61,448us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
Forfeited (number of shares) (4,664)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
Vested (number of shares) (85,113)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
[1]
Ending balance (number of shares) 127,975us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
Weighted-Average Grant Date Fair Value  
Beginning balance, weighted average grant date fair value (dollars per share) $ 51.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
Ending balance, weighted average grant date fair value (dollars per share) $ 92.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
Southern California Edison | Performance Shares Classified As Equity Awards  
Restricted Stock Units  
Beginning balance (number of shares) 90,661us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Granted (number of shares) 35,516us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Forfeited (number of shares) (4,668)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Vested (number of shares) (44,293)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
[1]
Affiliate transfers, net (number of shares) (5,419)eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAffiliateTransfersNet
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Ending balance (number of shares) 71,797us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Weighted-Average Grant Date Fair Value  
Beginning balance, weighted average grant date fair value (dollars per share) $ 51.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Granted, weighted average grant date fair value (dollars per share) $ 61.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Forfeited, weighted average grant date fair value (dollars per share) $ 54.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Vested, weighted average grant date fair value (dollars per share) $ 51.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
[1]
Affiliate transfers, net, weighted average grant date fair value (dollars per share) $ 51.44eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAffiliateTransfersNetWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Ending balance, weighted average grant date fair value (dollars per share) $ 56.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsEquityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | Performance Shares Classified As Liability Awards  
Restricted Stock Units  
Beginning balance (number of shares) 90,357us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Granted (number of shares) 35,390us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Forfeited (number of shares) (4,664)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Vested (number of shares) (44,150)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
[1]
Affiliate transfers, net (number of shares) (5,413)eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAffiliateTransfersNet
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Ending balance (number of shares) 71,520us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Weighted-Average Grant Date Fair Value  
Beginning balance, weighted average grant date fair value (dollars per share) $ 51.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Ending balance, weighted average grant date fair value (dollars per share) $ 92.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= eix_PerformanceSharesClassifiedAsLiabilityAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
[1] 1 Relates to performance shares that will be paid in 2015 as performance targets were met at December 31, 2014