Note 7 - Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 53	$ 52	$ 50
Amortization of right-of-use assets	8	5	3
Interest on lease liabilities	2	2	1
Total finance lease cost	$ 10	$ 7	$ 4