Note 9 - Leases - Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating lease expense	$ 4	$ 4	$ 12	$ 13
Short-term lease expense	1	1	3	4
Total lease expense	$ 5	$ 5	$ 15	$ 17