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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | $ 338 | $ 432 | $ 471
Tax positions taken during the current year, Increases | 46 | 41 | 51
Tax positions taken during a prior year, Increases | 6 | 0 | 0
Tax positions taken during a prior year, Decreases | (20) | (108) | (7)
Tax positions taken during a prior year, Decreases for settlements during the period | 0 | (27) | (83)
Balance at December 31, | 370 | 338 | 432
SCE |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | 249 | 331 | 371
Tax positions taken during the current year, Increases | 47 | 42 | 51
Tax positions taken during a prior year, Increases | 6 | 0 | 0
Tax positions taken during a prior year, Decreases | (20) | (121) | (13)
Tax positions taken during a prior year, Decreases for settlements during the period | 0 | (3) | (78)
Balance at December 31, | $ 282 | $ 249 | $ 331

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