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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Southern California Edison |  |  |
Revenue Recognition [Abstract] |  |  |
Revenue received as agent |  |  | $ 1,100,000,000
Sales and Use Taxes [Abstract] |  |  |
Franchise fees billed to customers | 116,000,000 | 98,000,000 | 101,000,000
Dividend Restrictions [Abstract] |  |  |
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months) | 13 months |  |
Period for calculation of weighted average common equity component (months) | 13 months |  |
Weighted-average common equity component of total capitalization (as a percent) | 49.20% |  |
Capacity to pay additional dividends | 247,000,000 |  |
Restriction on net assets | $ 11,900,000,000 |  |
Edison International |  |  |
Dividend Restrictions [Abstract] |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) | 48.00% |  |
Electric Utility | Southern California Edison |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Supply of electricity, area covered (square mile) | 50,000 |  |

X
- Definition This element represents the capacity of the entity to pay additional dividends. + References No definition available. + Details
Name: | eix_CapacityToPayAdditionalDividends
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | eix_DividendRestrictionsAbstract
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
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

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- Definition Period for Calculation of Weighted Average Common Equity Component + References No definition available. + Details
Name: | eix_PeriodForCalculationOfWeightedAverageCommonEquityComponent
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Restriction on Net Assets + References No definition available. + Details
Name: | eix_RestrictionOnNetAssets
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the revenue received by the entity as a billing agent from long-term contracts with CDWR. + References No definition available. + Details
Name: | eix_RevenueReceivedAsAgent
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | eix_SalesAndUseTaxesAbstract
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | eix_SummaryOfSignificantAccountingPoliciesLineItems
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- Definition This element represents the total area covered in supply of electricity. + References No definition available. + Details
Name: | eix_SupplyOfElectricityAreaCovered
Namespace Prefix: | eix_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted Average Common Equity Component Authorization Set by C.P.U.C Remaining over Number of Months + References No definition available. + Details
Name: | eix_WeightedAverageCommonEquityComponentAuthorizationSetByCPUCRemainingOverNumberOfMonths
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 This element represents the percentage of weighted-average common equity component of total capitalization required to distribute the dividend. + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | num:percentItemType
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- Details
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