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Variable Interest Entities (Table) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Trust I |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | $ 27 eix_VariableInterestEntitiesDividendIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | $ 27 eix_VariableInterestEntitiesDividendIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | $ 17 eix_VariableInterestEntitiesDividendIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember
Dividend distributions | 27 eix_VariableInterestEntitiesDividendDistributions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | 27 eix_VariableInterestEntitiesDividendDistributions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember | 17 eix_VariableInterestEntitiesDividendDistributions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIMember
Trust II |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | 20 eix_VariableInterestEntitiesDividendIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember | 19 eix_VariableInterestEntitiesDividendIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember |
Dividend distributions | 20 eix_VariableInterestEntitiesDividendDistributions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember | 19 eix_VariableInterestEntitiesDividendDistributions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIiMember |
Trust III |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | 13 eix_VariableInterestEntitiesDividendIncome / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIIIMember |  |
Dividend distributions | $ 13 eix_VariableInterestEntitiesDividendDistributions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_VariableInterestEntitiesByNameOfEntityAxis = eix_SouthernCaliforniaEdisonTrustIIIMember |  |

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