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Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SCE |  |  |
Significant Accounting Policies [Line Items] |  |  |
Franchise fees billed to customers | $ 133 | $ 111 | $ 138

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- Definition This element represents the franchise fees billed to customers. + References No definition available. + Details
Name: | eix_FranchiseFeesBilledToCustomers
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | eix_SignificantAccountingPoliciesLineItems
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |