Leasing (Lease, Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease expense	$ 29	$ 33	$ 46
Variable lease expense	5	4	7
Total lease expense, net	$ 34	$ 37	$ 53