Leases - Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Amortization of right-of-use asset	$ 28	$ 28	$ 7
Interest on lease liability	16	17	4
Operating lease cost	162	151	200
Short-term lease cost	107	23	33
Variable lease cost	59	27	73
Sublease income	(4)	0	0
Total lease costs	$ 368	$ 246	$ 317