Income Taxes (Summary of 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]
Unrecognized tax benefits — January 1	$ 114	$ 129	$ 136
Gross Increases - Current year tax positions	0	0	3
Gross Increases - Prior year tax positions	0	0	0
Gross Decreases - Prior year tax positions	(1)	(3)	(5)
Settlements	0	(12)	(5)
Lapse of Statute of Limitations	(1)	0	0
Currency Translation Adjustment	(1)	0	0
Unrecognized tax benefits — December 31	$ 111	$ 114	$ 129