Leases - Components of Lease Expense and Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 133	$ 135
Finance lease cost:
Amortization of right-of-use assets	2	2
Interest on lease liabilities	0	1
Variable lease cost	22	20
Total lease cost	157	158
Short-term lease cost (less than $1 million)	$ 1	$ 1