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Commitments and Contingencies (Schedule of Settlement Agreement) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |
Total pre-tax charge | $ 738 | $ 21 | $ 5
SCE |  |  |
Loss Contingencies [Line Items] |  |  |
Total pre-tax charge | 716 | $ 0 | $ 0
Total after-tax charge | 448 |  |
SCE | Utility Shareholder Agreement |  |  |
Loss Contingencies [Line Items] |  |  |
Total pre-tax charge | 143 |  |
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 |  |

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