Leasing (Lease, Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease expense	$ 46	$ 46	$ 45
Variable lease expense	7	8	8
Total lease expense, net	$ 53	$ 54	$ 53