Note 7 - Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating lease cost	$ 58	$ 53	$ 52
Amortization of right-of-use assets	9	8	5
Interest on lease liabilities	2	2	2
Total finance lease cost	$ 11	$ 10	$ 7