Note 5 - Leases - Summary of Income Recognized on Lease Arrangements (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Lease income		$ 2	$ 2	$ 4	$ 4
Variable lease income	[1]	1	2	3	3
Total lease income		$ 3	$ 4	$ 7	$ 7

[1] Variable lease income primarily represents operating costs under real estate leases and incremental variable income based on usage under equipment leases.