Leases - Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 226	$ 192	$ 124
Short-term lease cost	56	59	34
Variable lease cost	71	60	62
Total lease cost	$ 353	$ 311	$ 220