Leases - Components of Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating	$ 237	$ 223	$ 204
Sublease income	(38)	(34)	(33)
Total net lease costs	$ 199	$ 189	$ 171