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Commitments and Contingencies (Spent Nuclear Fuel) (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |  |  |
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Apr. 30, 2016 | Jun. 30, 2010 | Apr. 30, 2018 | Mar. 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 |  |  |  |  |  | $ 43.0 |
Southern California Edison |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought |  | $ 112.0 |  |  |  |  |
Damage award | $ 124.0 |  |  |  |  |  |
DOE determination of claim reimbursement |  |  |  | $ 44.0 | $ 58.0 | $ 34.0 |
Disallowed claim amount |  |  |  | $ 14.0 |  |  |
Subsequent event |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Request for Recovery |  |  | $ 1.2 |  |  |  |

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