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Compensation and Benefit Plans (Supplemental Data on Stock-Based Compensation) (Details) (Employee Stock Option, USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value per option granted (dollars per share) | $ 7.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 5.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 5.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Fair value of options vested | $ 17 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | $ 17 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | $ 17 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Cash used to purchase shares to settle options | 300 eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedToSettleAwardsCashOutflow | 199 eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedToSettleAwardsCashOutflow | 169 eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedToSettleAwardsCashOutflow
Cash from participants to exercise stock options | 205 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 140 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 101 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Value of options exercised | 95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Tax benefits from options exercised | 39 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 24 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 27 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Southern California Edison |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value per option granted (dollars per share) | $ 7.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 5.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 5.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Fair value of options vested | 9 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 10 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 10 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Cash used to purchase shares to settle options | 181 eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedToSettleAwardsCashOutflow / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 130 eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedToSettleAwardsCashOutflow / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 96 eix_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedToSettleAwardsCashOutflow / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Cash from participants to exercise stock options | 125 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 92 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 59 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Value of options exercised | 56 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 37 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Tax benefits from options exercised | $ 23 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 15 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 15 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under share-based payment arrangements. + References No definition available. + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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