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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
SCE and other owners of San Onofre and Palo Verde |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought |  |  | $ 142 |  |  |  |
Damage award |  | $ 162 |  |  |  |  |
DOE determination of claim reimbursement |  |  |  | $ 45 |  | $ 43 |
Southern California Edison |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought |  |  | $ 112 |  |  |  |
Damage award |  | 124 |  |  |  |  |
Legal and other costs |  | $ 2 |  |  |  |  |
Damage award, customers | $ 106 |  |  |  |  |  |
Damage award, shareholders | 17 |  |  |  |  |  |
DOE determination of claim reimbursement |  |  |  | 35 | $ 58 | $ 34 |
Disallowed claim amount |  |  |  | $ 13 |  |  |
Southern California Edison | Regulatory balancing and memorandum accounts |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Damage award, customers | $ 72 |  |  |  |  |  |

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