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Commitments and Contingencies (Undiscounted Future Minimum Expected Payments for Power Purchase Agreements) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Renewable Energy Contracts |
Power Purchase Agreements, Fiscal Year Maturity |
2015 | $ 1,009 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember
2016 | 1,115 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember
2017 | 1,162 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember
2018 | 1,159 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember
2019 | 1,214 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember
Thereafter | 17,740 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember
Total future commitments | 23,399 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_RenewableEnergyContractsMember
QF Power Purchase Agreements |
Power Purchase Agreements, Fiscal Year Maturity |
2015 | 254 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember
2016 | 217 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember
2017 | 191 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember
2018 | 150 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember
2019 | 88 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember
Thereafter | 69 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember
Total future commitments | 969 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_QualifyingFacilityPowerPurchaseAgreementsMember
Other Purchase Agreements |
Power Purchase Agreements, Fiscal Year Maturity |
2015 | 830 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember
2016 | 724 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember
2017 | 729 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember
2018 | 592 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember
2019 | 496 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember
Thereafter | 1,504 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember
Total future commitments | $ 4,875 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = eix_OtherPowerPurchaseAgreementsMember

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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the four fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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