Operating Leases - Components of Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease costs	$ 13	$ 13	$ 12
Short-term lease costs		1	1
Variable costs	2	1	1
Total	$ 15	$ 15	$ 14