Leases - Components of lease expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Components of lease expense
Operating lease expense	$ (110)	$ (94)
Finance lease expense	(2)	(2)
Variable lease expense	(22)	(20)
Sublease income	3	3
Net lease expense	$ (131)	$ (113)