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Compensation and Benefit Plans (Changes in Plan Assets and Benefits Obligations Recognized in OCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Unrecognized net loss to be amortized | $ (3) |  |
Unrecognized prior service cost (credit) to be amortized | (1) |  |
Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Net loss | 5 | $ 0 | $ 6
Settlement charges | 0 | (6) | 0
Amortization of net loss | (9) | (10) | (10)
Total recognized in other comprehensive loss | (4) | (16) | (4)
Total recognized in expense and other comprehensive loss | 61 | 76 | 97
Unrecognized net loss to be amortized | 8 |  |
Unrecognized prior service cost (credit) to be amortized | 2 |  |
Amount of net loss expected to be reclassified from other comprehensive loss | 8 |  |
SCE | Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Unrecognized net loss to be amortized | (3) |  |
Unrecognized prior service cost (credit) to be amortized | (1) |  |
SCE | Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Net loss | 5 | 3 | 4
Settlement charges | 0 | 0 | 0
Amortization of net loss | (6) | (6) | (6)
Total recognized in other comprehensive loss | (1) | (3) | (2)
Total recognized in expense and other comprehensive loss | 60 | $ 72 | $ 91
Unrecognized net loss to be amortized | 6 |  |
Unrecognized prior service cost (credit) to be amortized | 2 |  |
Amount of net loss expected to be reclassified from other comprehensive loss | $ 6 |  |

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