Leases Supplemental cash flow information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 37	$ 37
Operating cash flows from finance leases	13	15
Financing cash flows from finance leases	29	29
ROU assets obtained in exchange for finance lease liabilities	0	78	$ 0
ROU assets obtained in exchange for operating lease liabilities	$ 52	$ 58