Leases (Components of Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of lease costs:
Operating lease cost	$ 54	$ 48	$ 45
Short-term lease cost	15	35	45
Variable lease cost	3	3	1
Total lease cost	$ 72	$ 86	$ 91