Leases - (Cash flow) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases
Operating cash flows from operating leases	$ 14	$ 13	$ 17
Operating cash flows from finance lease	8	37	36
Financing cash flows from finance lease	$ 3	$ 33	$ 35