Leases Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lease Costs [Abstract]
Operating lease cost	$ 244	$ 246	$ 271
Variable lease cost	52	45	32
Sublease income	(95)	(103)	(99)
Net lease cost	$ 201	$ 188	$ 204