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Commitments and Contingencies (Schedule of Settlement Agreement) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  | $ 78 | $ 738 | $ 21
SCE |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  | $ (12) | 716 | $ 0
Total after-tax charge | $ 448 |  |  | 448 |
SCE | Utility Shareholder Agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  |  | 143 |
SCE | Revised San Onofre settlement agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  | $ 716 |  |  |
SCE | DOE litigation regulatory liability |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  |  | (72) |
SCE | Arbitration with Mitsubishi Heavy Industries |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  |  | (47) |
SCE | GHG Reduction Program |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  |  | (10) |
SCE | San Onofre base regulatory asset |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  |  | 696 |
SCE | Other |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total pre-tax charge |  |  |  | $ 6 |
Settled litigation | The Utilities | Revised San Onofre settlement agreement |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Funding obligation | $ 10 |  |  |  |

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