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Commitments and Contingencies (Details) |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May. 06, 2015 USD ($) | Apr. 17, 2015 USD ($) | Oct. 31, 2013 USD ($) | Jun. 30, 2015 USD ($) invoices site | Jun. 30, 2014 USD ($) | Dec. 31, 2012 USD ($) | Jun. 01, 2015 USD ($) | Aug. 31, 2014 USD ($)
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] |  |  |  |  |  |  |  |
San Bernardino settlement amount |  |  |  |  |  |  |  | $ 433,000,000
Southern California Edison |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought | $ 38,200,000 | $ 648,000,000 |  | $ 182,000,000 |  |  |  |
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 |  |  |  | $ 115,000,000 |  |  |  |
Immaterial sites for environmental remediation (in number of sites) | site |  |  |  | 39 |  |  |  |
Total minimum recorded liability for immaterial sites |  |  |  | $ 4,000,000 |  |  |  |
Environmental remediation liability |  |  |  | 119,000,000 |  |  |  |
Regulatory assets related to environmental remediation |  |  |  | 116,000,000 |  |  |  |
Portion of recorded liability recoverable from incentive mechanism |  |  |  | $ 30,000,000 |  |  |  |
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 |  |  |  | $ 85,000,000 |  |  |  |
Environmental remediation costs to be recovered (as a percent) |  |  |  | 100.00% |  |  |  |
Amount that cleanup costs could exceed recorded liability for identified material sites |  |  |  | $ 159,000,000 |  |  |  |
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) |  |  |  | 4 years |  |  |  |
Expected annual environmental remediation costs, low end of range |  |  |  | $ 6,000,000 |  |  |  |
Expected annual environmental remediation costs, high end of range |  |  |  | 24,000,000 |  |  |  |
Environmental remediation costs |  |  |  | 3,000,000 | $ 1,000,000 |  |  |
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 |  |  |  | $ 83,000,000 |  |  |  |
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 | Other Insurance Claims | San Onofre |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Ratepayer allocation of recovery from recoveries |  |  |  | 82.50% |  |  |  |
Entity allocation of recovery from recoveries |  |  |  | 17.50% |  |  |  |
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] |  |  |  |  |  |  |  |
Reduction in policy benefits following retirement of assets |  |  |  | 90.00% |  |  |  |
San Bernardino settlement amount |  |  |  |  |  |  |  | $ 339,000,000
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 |  |  |  | 41,000,000 |  |  |  |
2016 additional commitments |  |  |  | 208,000,000 |  |  |  |
2017 additional commitments |  |  |  | 297,000,000 |  |  |  |
2018 additional commitments |  |  |  | 347,000,000 |  |  |  |
2019 additional commitments |  |  |  | 384,000,000 |  |  |  |
Additional commitments due after 2019 |  |  |  | $ 4,700,000,000 |  |  |  |

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- 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 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 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 Number of Invoices for Reimbursement + 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 Reduction in Policy Benefits Following Retirement of Assets + 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 Warranty Period + References No definition available. + Details
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- Definition Wildfire Threshold For Additional Coverage + 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 Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: 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 4: 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 + 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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- 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. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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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