Revenues (Revenue By Geographic Area) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 2,045	$ 1,961	$ 1,819
United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,911	1,851	1,767
International [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 134	$ 111	$ 52