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v2.4.1.9

Property, Plant and Equipment (Textual) (Details) (Southern California Edison, USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |  |
Capitalized software costs | $ 1,700,000,000 us-gaap_CapitalizedComputerSoftwareGross | $ 1,600,000,000 us-gaap_CapitalizedComputerSoftwareGross |  | $ 1,600,000,000 us-gaap_CapitalizedComputerSoftwareGross
Capitalized software, accumulated amortization | 1,000,000,000 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization | 839,000,000 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization |  | 839,000,000 us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
Capitalized software, amortization expense | 271,000,000 us-gaap_CapitalizedComputerSoftwareAmortization | 251,000,000 us-gaap_CapitalizedComputerSoftwareAmortization | 217,000,000 us-gaap_CapitalizedComputerSoftwareAmortization |
Capitalized software, estimated annual amortization expense for 2015 through 2019 | 275,000,000 eix_CapitalizedComputerSoftwareEstimatedAmortizationNextFiveYears |  |  |
Four Corners Unit 4 And 5 (coal) |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Sale price of investment in facility |  |  |  | 181,000,000 eix_SaleOfInvestmentInFacility / us-gaap_JointlyOwnedUtilityPlantAxis = eix_FourCornersUnit4And5Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Benefit to ratepayer on sale of Four Corners |  |  |  | $ 166,000,000 eix_BenefittoRatepayers / us-gaap_JointlyOwnedUtilityPlantAxis = eix_FourCornersUnit4And5Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Minimum | Capitalized Software Costs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated Useful Lives | 5 years |  |  |
Maximum | Capitalized Software Costs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated Useful Lives | 15 years |  |  |

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- Definition The estimated selling price of the utility's investment in a jointly owned generating facility. + References No definition available. + Details
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- Definition For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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