Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Amount	$ 17	$ 18	$ 20
Increases in unrecognized tax benefits—prior years	4	0	0
(Decreases) in unrecognized tax benefits—prior years	(9)	(1)	(2)
Increases in unrecognized tax benefits—current year	0	0	0
(Decreases) in unrecognized tax benefits—current year	0	0	0
Settlements with taxing authorities	0	0	0
Amount	12	17	18
Unrecognized tax benefits that, if recognized, would favorably impact the effective rate	$ 12	$ 0	$ 0