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Commitments and Contingencies (Details) |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2015 USD ($) communication | Aug. 05, 2015 USD ($) | May. 06, 2015 USD ($) | Apr. 17, 2015 USD ($) | Oct. 31, 2015 USD ($) claims | Oct. 31, 2013 USD ($) | Sep. 30, 2015 USD ($) site invoices | Sep. 30, 2014 USD ($) | Dec. 31, 2012 USD ($) | Jun. 01, 2015 USD ($) | Aug. 31, 2014 USD ($)
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of claims | claims |  |  |  |  | 2 |  |  |  |  |  |
Nuclear Insurance |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Federal limit on public liability claims from nuclear incident, approximate |  |  |  |  |  |  | $ 13,400,000,000 |  |  |  |
Nuclear Insurance | San Onofre |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated settlement amount |  |  |  |  |  |  |  |  |  |  | $ 433,000,000
Nuclear Insurance | Subsequent Event | San Onofre |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Claims paid |  |  |  |  | $ 400,000,000 |  |  |  |  |  |
Southern California Edison |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  | $ 38,200,000 | $ 648,000,000 |  |  | 182,000,000 |  |  |  |
Number of communications that should have been reported |  | 9 |  |  |  |  |  |  |  |  |
Minimum damages |  | $ 500 |  |  |  |  | $ 4,000,000 |  |  |  |
Maximum damages |  | $ 50,000 |  |  |  |  |  |  |  |  |
Identified material sites for environmental remediation (in number of sites) | site |  |  |  |  |  |  | 19 |  |  |  |
Minimum costs to be Identified Site |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Minimum liability for environmental remediation for material sites |  |  |  |  |  |  | $ 137,000,000 |  |  |  |
Immaterial sites for environmental remediation (in number of sites) | site |  |  |  |  |  |  | 39 |  |  |  |
Environmental remediation liability |  |  |  |  |  |  | $ 140,000,000 |  |  |  |
Regulatory assets related to environmental remediation |  |  |  |  |  |  | 135,000,000 |  |  |  |
Portion of recorded liability recoverable from incentive mechanism |  |  |  |  |  |  | $ 50,000,000 |  |  |  |
Percentage of environmental remediation costs recoverable through an incentive mechanism (as a percent) |  |  |  |  |  |  | 90.00% |  |  |  |
Liability incurred at majority of the remaining sites through customer rates |  |  |  |  |  |  | $ 84,000,000 |  |  |  |
Environmental remediation costs to be recovered (as a percent) |  |  |  |  |  |  | 100.00% |  |  |  |
Amount that cleanup costs could exceed recorded liability for identified material sites |  |  |  |  |  |  | $ 163,000,000 |  |  |  |
Amount that cleanup costs could exceed recorded liability for immaterial sites |  |  |  |  |  |  | $ 8,000,000 |  |  |  |
Maximum expected period for cleanup of identified sites (in years) |  |  |  |  |  |  | 30 years |  |  |  |
Remediation cost estimates (period) |  |  |  |  |  |  | 5 years |  |  |  |
Expected annual environmental remediation costs, low end of range |  |  |  |  |  |  | $ 7,000,000 |  |  |  |
Expected annual environmental remediation costs, high end of range |  |  |  |  |  |  | 24,000,000 |  |  |  |
Environmental remediation costs |  |  |  |  |  |  | 5,000,000 | $ 3,000,000 |  |  |
Insurance coverage for wildfire liabilities Limit |  |  |  |  |  |  | 390,000,000 |  |  | $ 610,000,000 |
Self insurance retention per wildfire occurrence |  |  |  |  |  |  |  |  |  | $ 10,000,000 |
Threshold for wildfire claims (new lines for additional coverage) |  |  |  |  |  |  | 610,000,000 |  |  |  |
Southern California Edison | San Onofre |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum liability for environmental remediation for material sites |  |  |  |  |  |  | $ 82,000,000 |  |  |  |
Southern California Edison | San Onofre | Mitsubishi Heavy Industries Ltd |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  | $ 4,000,000,000 |  |  |  |  |
Number of invoices for reimbursement | invoices |  |  |  |  |  |  | 7 |  |  |  |
Invoiced amount for reimbursement |  |  |  |  |  |  | $ 149,000,000 |  |  |  |
Invoiced amount paid for reimbursement |  |  |  |  |  |  | $ 45,000,000 |  |  |  |
Share of invoice paid |  |  |  |  |  |  |  |  | $ 35,000,000 |  |
Southern California Edison | San Onofre | Mitsubishi Heavy Industries Ltd |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratepayer allocation of recovery from recoveries |  |  |  |  |  |  | 50.00% |  |  |  |
Entity allocation of recovery from recoveries |  |  |  |  |  |  | 50.00% |  |  |  |
Ratepayer allocation of recovery from recoveries, initial amount of settlement |  |  |  |  |  |  | $ 282,000,000 |  |  |  |
Southern California Edison | San Onofre | Replacement Steam Generators |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warranty period |  |  |  |  |  |  | 20 years |  |  |  |
Southern California Edison | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communications that should have been reported | communication | 8 |  |  |  |  |  |  |  |  |  |
Estimated settlement amount | $ 16,740,000 |  |  |  |  |  |  |  |  |  |
Southern California Edison | Nuclear Insurance |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Limit on assessment of retrospective premium adjustments, per year, approximate |  |  |  |  |  |  | $ 52,000,000 |  |  |  |
Maximum assessment per each nuclear incident |  |  |  |  |  |  | 255,000,000 |  |  |  |
Maximum yearly assessment per nuclear incident |  |  |  |  |  |  | 38,000,000 |  |  |  |
Southern California Edison | Nuclear Insurance | San Onofre |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated settlement amount |  |  |  |  |  |  |  |  |  |  | $ 339,000,000
Southern California Edison | Nuclear Insurance | Subsequent Event | San Onofre |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Claims paid |  |  |  |  | $ 313,000,000 |  |  |  |  |  |
Ratepayer allocation of recovery from recoveries |  |  |  |  | 95.00% |  |  |  |  |  |
Entity allocation of recovery from recoveries |  |  |  |  | 5.00% |  |  |  |  |  |
Mitsubishi Heavy Industries Ltd | San Onofre |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum liability per purchase agreement for damages |  |  |  |  |  |  | 138,000,000 |  |  |  |
Asserted counterclaim |  |  |  |  |  | $ 41,000,000 |  |  |  |  |
SCE and other owners of San Onofre and Palo Verde | Nuclear Insurance | San Onofre and Palo Verde |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss limit, property damage insurance, federal minimum requirement |  |  |  |  |  |  | 1,060,000,000 |  |  |  |
Power Purchase Contracts | Southern California Edison |  |  |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
2015 additional commitments |  |  |  |  |  |  | 21,000,000 |  |  |  |
2016 additional commitments |  |  |  |  |  |  | 142,000,000 |  |  |  |
2017 additional commitments |  |  |  |  |  |  | 303,000,000 |  |  |  |
2018 additional commitments |  |  |  |  |  |  | 352,000,000 |  |  |  |
2019 additional commitments |  |  |  |  |  |  | 391,000,000 |  |  |  |
Additional commitments due after 2019 |  |  |  |  |  |  | $ 5,200,000,000 |  |  |  |

X
- Definition The potential estimated cleanup costs for identified material sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. + References No definition available. + Details
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- Definition The potential estimated cleanup costs for immaterial sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. + References No definition available. + Details
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- Definition The high end of the range of expected remediation costs in each of the next several years. + References No definition available. + Details
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- Definition The low end of the range of expected remediation costs in each of the next several years. + References No definition available. + Details
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- Definition Expected Annual Environmental Remediation Costs, Period for Cost Estimates + References No definition available. + Details
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- Definition The approximate maximum amount of public liability, as limited by federal law, resulting from a nuclear incident. + References No definition available. + Details
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- Definition This element represents the increase in self insurance retention per wildfire occurrence. + References No definition available. + Details
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- Definition The approximate maximum yearly retrospective premium adjustments that could be assessed against the entity. + References No definition available. + Details
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- Definition Loss Limit, Property Damage Insurance, Federal Minimum Requirement + References No definition available. + Details
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- Definition The maximum amount of deferred insurance premium based on each nuclear incident occurring. + References No definition available. + Details
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- Definition Maximum Expected Period for Clean Up of Identified Sites + References No definition available. + Details
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- Definition The maximum aggregate potential liability under the purchase agreement for damages and other amounts in connection with environmental liabilities. + References No definition available. + Details
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- Definition The maximum amount of additional insurance premium per yearly assessment charged for each nuclear incident. + References No definition available. + Details
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- Definition The upper end of the range of a site's cost estimate must be at least this amount to be classified as a material identified site. Below this amount an identified site will be an immaterial site. + References No definition available. + Details
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- Definition Number Of Communications That Should Have Been Reported + References No definition available. + Details
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- Definition The number of immaterial identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. + References No definition available. + Details
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- Definition The number of material identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. + References No definition available. + Details
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- Definition The percentage of environmental remediation costs entity will recover through incentive mechanism. + References No definition available. + Details
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- Definition Represents the percentage of environmental remediation costs to be recovered. + References No definition available. + Details
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- Definition The portion of the recorded liability for environmental remediation costs recoverable through incentive mechanism. + References No definition available. + Details
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- Definition Public Utilities, Incremental Inspection and Repair Costs, Payments from Third Party + References No definition available. + Details
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- Definition Ratepayer Allocation of Recovery from Recoveries + References No definition available. + Details
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- Definition Ratepayer Allocation of Recovery from Recoveries, Initial Amount of Settlement + References No definition available. + Details
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- Definition Represents the recorded liability incurred at majority of the remaining sites through customer rates. + References No definition available. + Details
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- Definition Regulatory Assets, Noncurrent, Environmental Remediation + References No definition available. + Details
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- Definition Schedule Of Commitments And Contingencies [Line Items] + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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