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Regulatory Assets and Liabilities (Textual) (Details) - SCE | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Regulatory Assets [Line Items] |  |
Regulatory assets, energy derivatives, low range of contract expiration (in years) | 2 years |
Regulatory assets, energy derivatives, high range of contract expiration (in years) | 3 years |
Regulatory assets related to deferred income taxes, recovery period, low range (in years) | 1 year |
Regulatory assets related to deferred income taxes, recovery period, high range (in years) | 60 years |
Low end of the range of remaining original amortization (in years) | 10 years |
High end of the range of remaining original amortization (in years) | 40 years |
Unamortized investments, net of accumulated amortization |  |
Regulatory Assets [Line Items] |  |
Return rate earned on assets included in rate base (as a percent) | 7.68% | 7.61%

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- Definition Regulatory Assets, Energy Derivative Contracts, High Range of Expiration + References No definition available. + Details
Name: | eix_RegulatoryAssetsEnergyDerivativeContractsHighRangeOfExpiration
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Regulatory Assets, Energy Derivative Contracts, Low Range of Expiration + References No definition available. + Details
Name: | eix_RegulatoryAssetsEnergyDerivativeContractsLowRangeOfExpiration
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Regulatory Assets, Recovery Period, High Range + References No definition available. + Details
Name: | eix_RegulatoryAssetsRecoveryPeriodHighRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Regulatory Assets, Recovery Period, Low Range + References No definition available. + Details
Name: | eix_RegulatoryAssetsRecoveryPeriodLowRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Regulatory Noncurrent Asset, Amortization Period, High End of Range + References No definition available. + Details
Name: | eix_RegulatoryNoncurrentAssetAmortizationPeriodHighEndofRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Regulatory Noncurrent Asset, Amortization Period, Low End of Range + References No definition available. + Details
Name: | eix_RegulatoryNoncurrentAssetAmortizationPeriodLowEndofRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the return rate earned on assets included in rate base. + References No definition available. + Details
Name: | eix_ReturnRateEarnedOnAssetsIncludedInRateBase
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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_RegulatoryAssetLineItems
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_RegulatoryAssetAxis=eix_GenerationInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |