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Commitments and Contingencies (Spent Nuclear Fuel) (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2016 | Jun. 30, 2010 | Feb. 28, 2017 | Sep. 30, 2016
SCE and other owners of San Onofre and Palo Verde |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages sought |  | $ 142 |  |
Damage award | $ 162 |  |  |
SCE |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages sought |  | $ 112 |  |
Damage award | $ 124 |  |  |
Claim to recover damages incurred |  |  |  | $ 56
SCE | Subsequent event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Claim to recover damages incurred |  |  | $ 43 |

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