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Commitments and Contingencies (Waiver of CPUC Equity Ratio Requirement) (Details) - SCE | 12 Months Ended
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Dec. 31, 2018
Other Commitments [Line Items] |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) | 48.00%
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months) | 37 months
Waiver threshold percent | 47.00%

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- Definition Waiver Threshold, Common Equity Component, Percentage of Total Capitalization + References No definition available. + Details
Name: | eix_WaiverThresholdCommonEquityComponentPercentageofTotalCapitalization
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted Average Common Equity Component Authorization, Remaining over Number of Months + References No definition available. + Details
Name: | eix_WeightedAverageCommonEquityComponentAuthorizationRemainingoverNumberofMonths
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the authorized percentage of weighted-average common equity component of total capitalization required to distribute the dividend. + References No definition available. + Details
Name: | eix_WeightedAverageCommonEquityComponentMinimumPercentageAuthorizationSetByCPUC
Namespace Prefix: | eix_
Data Type: | num:percentItemType
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_OtherCommitmentsLineItems
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: |