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Compensation and Benefit Plans (Changes in Plan Assets and Benefits Obligations Recognized in OCI) (Details) - Pension Plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension and Other Postretirement Benefits [Line Items] |  |  |
Net loss | $ 11 | $ 19 | $ 5
Amortization of net loss | (10) | (7) | (9)
Total recognized in other comprehensive loss | 1 | 12 | (4)
Total recognized in expense and other comprehensive loss | 59 | 82 | 61
SCE |  |  |
Pension and Other Postretirement Benefits [Line Items] |  |  |
Net loss | 9 | 21 | 5
Amortization of net loss | (7) | (5) | (6)
Total recognized in other comprehensive loss | 2 | 16 | (1)
Total recognized in expense and other comprehensive loss | $ 56 | $ 80 | $ 60

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