Leases (Supplemental cash flow) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating activities	$ 66	$ 65	$ 67
ROU assets obtained in exchange for new lease liabilities	$ 64	$ 28	$ 49