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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 | Sep. 30, 2016
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 |  |
Southern California Edison |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Damages sought |  | $ 112.0 |
Damage award | $ 124.0 |  |
Claim to recover damages incurred |  |  | $ 56.4

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