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Commitments and Contingencies (MHI Claims) (Details) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2013 USD ($) invoice | Oct. 31, 2013 USD ($) | Jun. 30, 2010 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2012 USD ($)
Southern California Edison |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Damages sought |  |  | $ 112,000,000 |  |
San Onofre | Southern California Edison | Mitsubishi Heavy Industries Ltd |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
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
San Onofre | Southern California Edison | Mitsubishi Heavy Industries Ltd | Minimum |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Damages sought |  | $ 4,000,000,000 |  |  |
San Onofre | Southern California Edison | 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 |
San Onofre | Southern California Edison | Replacement Steam Generators |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Warranty period |  |  |  | 20 years |
San Onofre | Mitsubishi Heavy Industries Ltd |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Maximum liability per purchase agreement for damages |  |  |  | $ 138,000,000 |
Asserted counterclaim |  | $ 41,000,000 |  |  |

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