Leases - Right of Use Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Right-of-use assets obtained in exchange for operating lease obligations	$ 16	$ 35	$ 26
Weighted-average remaining lease term in years	6 years	6 years	6 years
Weighted-average discount rate	5.40%	5.60%	5.90%