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Commitments and Contingencies (Details) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 14, 2016 USD ($) | Apr. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Oct. 31, 2013 USD ($) | Jun. 30, 2010 USD ($) | Jun. 30, 2016 USD ($) site invoice | Jun. 30, 2015 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2015 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages sought |  |  | $ 39,900,000 |  |  |  |  |  |
Nuclear Insurance |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Federal limit on public liability claims from nuclear incident, approximate |  |  |  |  |  | $ 13,400,000,000 |  |  |
Southern California Edison |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | $ 112,000,000 |  |  |  |
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 |  |  |  |  |  | $ 130,000,000 |  |  |
Immaterial sites for environmental remediation (in number of sites) | site |  |  |  |  |  | 39 |  |  |
Environmental remediation liability |  |  |  |  |  | $ 134,000,000 |  |  |
Regulatory assets related to environmental remediation |  |  |  |  |  | 128,000,000 |  |  |
Portion of recorded liability recoverable from incentive mechanism |  |  |  |  |  | $ 46,000,000 |  |  |
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 |  |  |  |  |  | $ 82,000,000 |  |  |
Environmental remediation costs to be recovered (as a percent) |  |  |  |  |  | 100.00% |  |  |
Amount that cleanup costs could exceed recorded liability for identified material sites |  |  |  |  |  | $ 165,000,000 |  |  |
Amount that cleanup costs could exceed recorded liability for immaterial sites |  |  |  |  |  | $ 7,000,000 |  |  |
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 |  |  |  |  |  | $ 7,000,000 |  |  |
Expected annual environmental remediation costs, high end of range |  |  |  |  |  | 23,000,000 |  |  |
Environmental remediation costs |  |  |  |  |  | 1,000,000 | $ 3,000,000 |  |
Threshold for wildfire claims (new lines for additional coverage) |  |  |  |  |  | 910,000,000 |  |  |
Increase in self-insurance |  |  |  |  |  | 90,000,000 |  |  |
Combined threshold for wildfire claims |  |  |  |  |  | 1,000,000,000 |  |  |
Self-insured retention per wildfire occurrence |  |  |  |  |  | 10,000,000 |  |  |
Damage award |  | $ 124,000,000 |  |  |  |  |  |  |
Southern California Edison | San Onofre |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Minimum liability for environmental remediation for material sites |  |  |  |  |  | $ 79,000,000 |  |  |
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 | invoice |  |  |  |  |  | 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 | 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 |  |  |
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 |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | $ 142,000,000 |  |  |  |
Damage award |  | $ 162,000,000 |  |  |  |  |  |  |
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 |  |  |
Maximum |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Minimum liability for environmental remediation for immaterial sites |  |  |  |  |  |  |  |  | $ 74,500,000
Maximum | Subsequent Event |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Penalties per day per violation | $ 50,000 |  |  |  |  |  |  |  |
Minimum | Subsequent Event |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Penalties per day per violation | $ 500 |  |  |  |  |  |  |  |
Minimum | Southern California Edison |  |  |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Minimum liability for environmental remediation for immaterial sites |  |  |  |  |  | $ 4,000,000 |  |  |

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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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