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Investments (Gains and (Losses) for Equity Securities) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Investment Holdings [Line Items] |  |
Gross realized gains | $ 39 | $ 23
Gross realized loss | (2) | 0
Net unrealized (losses) gains for equity securities | $ (376) | $ 168

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- Definition This item represents the amount of realized gain on investments in trust during the period from the sale of securities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This item represents the amount of realized loss on investments in trust during the period from the sale of securities. + References No definition available. + Details
Name: | eix_DecommissioningTrustRealizedLossOnInvestments
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This item represents the amount of net unrealized gain on investments in trust during the period. + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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