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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Unrecognized net loss to be amortized | $ (17) |  |
Unrecognized prior service cost (credit) to be amortized | (1) |  |
Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Net loss | 19 | $ 5 | $ 0
Settlement charges | 0 | 0 | (6)
Amortization of net loss | (7) | (9) | (10)
Total recognized in other comprehensive loss | 12 | (4) | (16)
Total recognized in expense and other comprehensive loss | 82 | 61 | 76
Unrecognized net loss to be amortized | 11 |  |
Unrecognized prior service cost (credit) to be amortized | 2 |  |
Amount of net loss expected to be reclassified from other comprehensive loss | 11 |  |
SCE | Postretirement Benefits Other Than Pensions |  |  |
Pension and Other Postretirement Benefits |  |  |
Unrecognized net loss to be amortized | (17) |  |
Unrecognized prior service cost (credit) to be amortized | (1) |  |
SCE | Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Net loss | 21 | 5 | 3
Settlement charges | 0 | 0 | 0
Amortization of net loss | (5) | (6) | (6)
Total recognized in other comprehensive loss | 16 | (1) | (3)
Total recognized in expense and other comprehensive loss | 80 | $ 60 | $ 72
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 |  |

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