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Commitments and Contingencies (Permanent Retirement of San Onofre) (Details) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 20, 2017 | Dec. 19, 2017 | Dec. 31, 2017 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |
Regulatory assets |  |  | $ 4,914 | $ 5,380
SCE |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Regulatory assets |  |  | 4,914 | 5,380
San Onofre | SCE |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Regulatory assets |  | $ 775 | 72 | $ 0
San Onofre | SCE |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Proceeds received |  | $ 72 |  |
Refund | $ 155 |  |  |
San Onofre | SCE | Arbitration with Mitsubishi Heavy Industries |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Proceeds received |  |  | $ 47 |

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