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Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Accumulated depreciation | $ (8,132)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation | $ (7,493)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Total utility property, plant and equipment | 32,859 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet | 30,379 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Southern California Edison |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Transmission | 10,391 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmission / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 9,117 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmission / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Distribution | 19,255 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDistribution / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 17,874 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDistribution / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Generation | 2,986 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 2,856 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
General plant and other | 4,889 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 4,674 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Accumulated depreciation | (8,132)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | (7,493)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total utility property, plant and equipment, Gross | 29,389 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 27,028 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Construction work in progress | 3,339 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 3,219 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Nuclear fuel, at amortized cost | 131 us-gaap_NuclearFuelNetOfAmortization / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 132 us-gaap_NuclearFuelNetOfAmortization / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total utility property, plant and equipment | 32,859 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 30,379 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Construction Work in Progress | 3,339 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 3,219 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Nuclear Fuel (at amortized cost) | 131 us-gaap_NuclearFuelNetOfAmortization / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 132 us-gaap_NuclearFuelNetOfAmortization / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Southern California Edison | Eldorado |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 81 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear fuel, at amortized cost | 0 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Plant in Service | 88 us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Construction Work in Progress | 81 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Accumulated Depreciation | 17 us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear Fuel (at amortized cost) | 0 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net Book Value | 152 us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Ownership Interest | 62.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = eix_EldoradoMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Southern California Edison | Pacific Intertie |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 14 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear fuel, at amortized cost | 0 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Plant in Service | 191 us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Construction Work in Progress | 14 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Accumulated Depreciation | 74 us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear Fuel (at amortized cost) | 0 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net Book Value | 131 us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Ownership Interest | 50.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PacificIntertieMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Southern California Edison | Palo Verde (nuclear) |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 83 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear fuel, at amortized cost | 131 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Plant in Service | 1,871 us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Construction Work in Progress | 83 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Accumulated Depreciation | 1,529 us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear Fuel (at amortized cost) | 131 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net Book Value | 556 us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Ownership Interest | 16.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = eix_PaloVerdeMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Southern California Edison | Total |  |
Public Utilities, Property, Plant and Equipment, Plant in Service [Abstract] |  |
Construction work in progress | 178 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_AggregateJointlyOwnedUtilityProjectsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear fuel, at amortized cost | 131 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_AggregateJointlyOwnedUtilityProjectsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Plant in Service | 2,150 us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = eix_AggregateJointlyOwnedUtilityProjectsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Construction Work in Progress | 178 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = eix_AggregateJointlyOwnedUtilityProjectsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Accumulated Depreciation | 1,620 us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = eix_AggregateJointlyOwnedUtilityProjectsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Nuclear Fuel (at amortized cost) | 131 us-gaap_NuclearFuelNetOfAmortization / us-gaap_JointlyOwnedUtilityPlantAxis = eix_AggregateJointlyOwnedUtilityProjectsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net Book Value | $ 839 us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount / us-gaap_JointlyOwnedUtilityPlantAxis = eix_AggregateJointlyOwnedUtilityProjectsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The total period end amount of plant in service and construction in progress net of accumulated depreciation for the utility's share of jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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- Definition The carrying amount as of the balance sheet of nuclear fuel held as property plant and equipment. This amount is net of amortization based on the energy produced over the life of the fuel. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. + References No definition available. + Details
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- Definition Period end amount of construction work in progress in public utility. + References No definition available. + Details
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- Definition Period end amount of property, plant and equipment (PPE) related to utility distribution. + References No definition available. + Details
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- Definition Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility. + References No definition available. + Details
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- Definition Period end amount of total net PPE. + References No definition available. + Details
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- Definition Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility. + References No definition available. + Details
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- Definition Period end amount of total gross PPE. + References No definition available. + Details
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- Definition Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility. + References No definition available. + Details
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