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]
Beginning balance	$ 98	$ 86	$ 78
Additions, based on tax positions related to current year	2	9	8
Additions for tax positions of prior years	11	25	15
Reductions for tax positions of prior years	(1)	(9)	(1)
Settlements	(1)	(4)	(1)
Lapses in statutes of limitation	(15)	(9)	(13)
Ending balance	$ 94	$ 98	$ 86