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Revenue (Textual) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue from Contract with Customer [Abstract] |  |
Commercial and other non-residential customers implied term | 20 years |
Southern California Edison |  |
Public Utilities, General Disclosures [Line Items] |  |
Franchise fees billed to customers | $ 28 | $ 29
Rate recovery period | 24 months |

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- Definition Commercial and Other Non-residential Customers Contract Term + References No definition available. + Details
Name: | eix_CommercialandOtherNonresidentialCustomersContractTerm
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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 Period For Rate Recovery1 + References No definition available. + Details
Name: | eix_PeriodForRateRecovery1
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
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: |