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Summary of Significant Accounting Policies (Organization and Basis of Presentation) (Details) mi² in Thousands | 9 Months Ended
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Sep. 30, 2018 mi²
Southern California Edison | Electric Utility |
Segment Reporting Information [Line Items] |
Supply of electricity, area covered (square mile) | 50

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- Definition Supply Of Electricity Area Covered 1 + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | num:areaItemType
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
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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: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=eix_ElectricUtilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |