Income Taxes (Reconciliation of Valuation Allowance of Deferred Tax Assets) (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 217	$ 191	$ 234
Change in assessment (a)	0	1	(2)
Current year operations	4	4	3
Other comprehensive income	(4)	3	(1)
Foreign currency and other	(16)	18	(43)
Balance at end of year	$ 201	$ 217	$ 191