Leases - Supplemental cash flow information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating cash flows for operating leases	$ 70	$ 60
Financing cash flows for finance leases	3	2
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	30	31
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 2	$ 15