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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Amount $ 84 $ 12 $ 17
Increases in unrecognized tax benefits—prior years 13 81 4
(Decreases) in unrecognized tax benefits—prior years 0 (1) (9)
Increases in unrecognized tax benefits—current year 36 0 0
(Decreases) in unrecognized tax benefits—current year 0 (8) 0
Settlements with taxing authorities 0 0 0
Amount 133 84 12
Unrecognized tax benefits that, if recognized, would favorably impact the effective rate $ 133 $ 84 $ 12