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v3.10.0.1

Revenue (Textual) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 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 | $ 47 | $ 46 | $ 104 | $ 103
Rate recovery period |  |  | 24 months |

X
- 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

X
- 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

X
- 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

X
- 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

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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