Leases - Supplemental cash flow information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating cash flows for operating leases	$ 94	$ 102
Operating cash flows for finance leases	1	0
Financing cash flows for finance leases	6	5
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	73	154
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 17	$ 4