Leases - Supplemental cash flow information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Operating cash flows for operating leases	$ 64	$ 70
Financing cash flows for finance leases	4	3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	57	144
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 6	$ 2