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Commitments and Contingencies (Schedule of Estimated Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |
Charge for wildfire-related claims | $ 4,669 | $ 4,669 | $ 0
SCE |  |  |
Loss Contingencies [Line Items] |  |  |
Charge for wildfire-related claims | 4,669 | 4,669 | $ 0
SCE | 2017/2018 Wildfire/Mudslide Events |  |  |
Loss Contingencies [Line Items] |  |  |
Charge for wildfire-related claims | 4,669 | 4,669 |
Expected insurance recoveries | (2,000) | (2,000) |
Expected revenue from FERC customers | 135 | 135 |
Total pre-tax charge | $ 2,500 | 2,534 |
Income tax benefit |  | (709) |
Total after-tax charge |  | $ 1,825 |

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