Leases Lease costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 40	$ 40
Short-term lease cost	18	24
Variable lease cost	12	11
Amortization of leased assets	19	18
Interest on lease liabilities	13	15
Total net lease cost	$ 102	$ 108