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Commitments and Contingencies (Spent Nuclear Fuel) (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2018 | Apr. 30, 2016 | Jun. 30, 2010 | May 31, 2018 | Oct. 31, 2017 | Feb. 28, 2017 | Sep. 30, 2016
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
DOE determination of claim reimbursement |  |  |  |  |  |  | $ 56.0
SCE and other owners of San Onofre and Palo Verde |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought |  |  | $ 142.0 |  |  |  |
Damage award |  | $ 162.0 |  |  |  |  |
DOE determination of claim reimbursement |  |  |  | $ 45.0 |  | $ 43.0 |
Southern California Edison |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought |  |  | $ 112.0 |  |  |  |
Damage award |  | 124.0 |  |  |  |  |
Legal and other costs |  | $ 2.0 |  |  |  |  |
Damage award, customers | $ 106.0 |  |  |  |  |  |
Damage award, shareholders | 17.0 |  |  |  |  |  |
DOE determination of claim reimbursement |  |  |  | 35.0 | $ 58.0 | $ 34.0 |
Disallowed claim amount |  |  |  | $ 13.0 |  |  |
Southern California Edison | Regulatory balancing and memorandum accounts |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Damage award, customers | $ 72.0 |  |  |  |  |  |

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