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Consolidated Statements of Changes in Equity (USD $) In Millions, unless otherwise specified | Total | Southern California Edison | Common Stock | Common Stock Southern California Edison | Additional Paid-in Capital Southern California Edison | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Southern California Edison | Retained Earnings | Retained Earnings Southern California Edison | Subtotal | Other | Preferred and Preference Stock | Preferred and Preference Stock Southern California Edison
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Balance, at the beginning of the period at Dec. 31, 2011 |  | $ 11,086 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 9,958 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | $ 2,360 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | $ 2,168 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 596 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (139)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (24)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 7,834 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 6,173 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 10,055 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 1,029 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 1,045 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (92)us-gaap_ProfitLoss | 1,660 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (183)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,660 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (183)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 91 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Other comprehensive income (loss), net of tax |  | 52 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 52 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 52 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Transfer of assets to Capistrano Wind Partners |  | (21)eix_TaxEffectUponTransferOfAssets |  |  | (21)eix_TaxEffectUponTransferOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 0 eix_TaxEffectUponTransferOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 0 eix_TaxEffectUponTransferOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (21)eix_TaxEffectUponTransferOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_TaxEffectUponTransferOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 eix_TaxEffectUponTransferOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
Dividends declared on common stock |  | (428)us-gaap_DividendsCommonStockCash | (469)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (428)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (469)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (428)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Dividends declared on preferred and preference stock |  |  | (91)eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (91)eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Dividends, distributions to noncontrolling interests and other |  | (93)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (2)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (91)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
Stock-based compensation and other |  | (80)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther | (57)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (3)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (13)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (77)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (44)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (80)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Noncash stock-based compensation and other |  | 38 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 18 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 37 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 18 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 38 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Issuance of preference stock |  | 804 eix_IssuanceOfPreferenceStockDuringPeriodValue | 804 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (21)eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 804 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 825 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Redemption of preference stock |  | (75)eix_RedemptionOfPreferenceStockDuringPeriodValue | (75)eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1 eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (1)eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1)eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1)eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (74)eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | (75)eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Balance, at the end of the period at Dec. 31, 2012 |  | 11,191 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 11,743 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,373 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 2,168 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 581 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (87)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (29)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 7,146 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 7,228 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 9,432 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,759 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,795 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [1] |  | 283 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |
Balance, at the end of the period at Mar. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period at Dec. 31, 2012 |  | 11,191 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 11,743 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,373 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 2,168 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 581 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (87)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (29)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 7,146 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 7,228 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 9,432 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,759 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,795 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,015 us-gaap_ProfitLoss | 1,000 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 915 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,000 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 915 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 100 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
Other comprehensive income (loss), net of tax |  | 74 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 18 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 74 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 18 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 74 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Dividends declared on common stock |  | (446)us-gaap_DividendsCommonStockCash | (486)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (446)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (486)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (446)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Dividends declared on preferred and preference stock |  |  | (100)eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (100)eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 0 eix_DividendsDeclaredOnPreferredAndPreferenceStockNotSubjectToMandatoryRedemption / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Dividends, distributions to noncontrolling interests and other |  | (100)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (100)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
Stock-based compensation and other |  | (48)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther | (43)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 5 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (53)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (44)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (48)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Noncash stock-based compensation and other |  | 18 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 19 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 25 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 15 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (6)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 4 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 19 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Issuance of preference stock |  | 387 eix_IssuanceOfPreferenceStockDuringPeriodValue | 387 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (13)eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 387 eix_IssuanceOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 400 eix_IssuanceOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Redemption of preference stock |  | (400)eix_RedemptionOfPreferenceStockDuringPeriodValue | (400)eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8 eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (8)eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (8)eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (8)eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (392)eix_RedemptionOfPreferenceStockDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | (400)eix_RedemptionOfPreferenceStockDuringPeriodValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Balance, at the end of the period at Dec. 31, 2013 |  | 11,691 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 12,138 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,403 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 2,168 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 592 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (13)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (11)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 7,548 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 7,594 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 9,938 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,753 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,795 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Balance, at the beginning of the period at Sep. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [1] |  | 283 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |
Balance, at the end of the period at Dec. 31, 2013 |  |  | 12,138 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [2] |  | 234 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |
Balance, at the end of the period at Mar. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period at Dec. 31, 2013 |  | 11,691 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 12,138 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,403 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 2,168 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 592 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (13)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (11)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 7,548 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 7,594 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 9,938 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,753 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,795 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 1,724 eix_NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingMezzanineEquity |  |  | 0 eix_NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingMezzanineEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  | 0 eix_NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingMezzanineEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 1,612 eix_NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingMezzanineEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 1,612 eix_NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingMezzanineEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingMezzanineEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 112 eix_NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingMezzanineEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
Net income (loss) |  | 1,721 us-gaap_ProfitLoss | 1,565 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] |  | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 1,565 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Other comprehensive income (loss), net of tax |  | (45)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (17)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (45)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (17)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (45)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
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Stock-based compensation and other |  | (89)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther | (44)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 15 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 20 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (104)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (64)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (89)eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 eix_StockIssuedDuringPeriodValueShareBasedCompensationAndOther / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
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Balance, at the end of the period at Dec. 31, 2014 |  | 12,982 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 13,282 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,445 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 2,168 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 618 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (58)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (28)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 8,573 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 8,454 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 10,960 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 2,022 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 2,070 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Balance, at the beginning of the period at Sep. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [2] |  | 408 us-gaap_ProfitLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |
Balance, at the end of the period at Dec. 31, 2014 |  |  | $ 13,282 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |
[1] | During the second quarter of 2013, SCE recorded an impairment charge of $575 million ($365 million after-tax) related to the permanent retirement of San Onofre Units 2 and 3
[2] | In the first quarter of 2014, SCE recorded an impairment charge of $231 million ($96 million after-tax) in 2014. During the fourth quarter of 2014, SCE reduced its estimated impact of the San Onofre OII Settlement by $68 million ($24 million after-tax) consistent with the advice filing for reimbursement of recorded costs.

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