Revenue (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue [Abstract]
Capitalized Contract Cost, Net	$ 18,000,000		$ 16,000,000
Capitalized Contract Cost, Amortization	4,000,000	$ 4,000,000
Capitalized Contract Cost, Impairment Loss	0	$ 0
Deferred revenue	$ 190,000,000		$ 155,000,000
Contracts with customers, period	1 year
Net contract liability	$ 45,000,000
Revenue recognized	$ 60,000,000