Leases - Lease Expense Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 90	$ 69
Short-term lease cost	0	1
Variable lease cost	4	4
Less: sublease income	(4)	(2)
Total lease expense, net	90	72
Cash paid for operating leases	66	50
Lease obligations in exchange for obtaining right-of-use assets, operating leases	$ 187	$ 75
Weighted-average remaining term (in years) - operating leases	7 years 3 months 14 days	6 years 18 days
Weighted-average discount rate - operating leases	1.83%	2.38%