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Related Party Transactions (Details) (Tax Allocation Agreement, Capistrano Wind Holdings, Affiliated Entity, USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Tax Allocation Agreement | Capistrano Wind Holdings | Affiliated Entity |
Related Party Transaction [Line Items] |
Due to affiliate under tax allocation agreements | $ 184 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_CounterpartyNameAxis = eix_CapistranoWindHoldingsMember / us-gaap_RelatedPartyTransactionAxis = eix_TaxAllocationAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember

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