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Commitments and Contingencies (Other Commitments) (Details) (Southern California Edison, Other contractual obligations, USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Southern California Edison | Other contractual obligations |
Other Commitments |
2015 | $ 86 us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember
2016 | 120 us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember
2017 | 101 us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember
2018 | 73 us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember
2019 | 58 us-gaap_PurchaseObligationDueInFifthYear / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember
Thereafter | 572 us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember
Total | $ 1,010 us-gaap_PurchaseObligation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherContractualObligationsMember

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- Details
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant