Note 5 - Leases - Summary of Income Recognized on Lease Arrangements (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Lease income - operating leases:
Lease income		$ 2	$ 2
Variable lease income	[1]	2	1
Total lease income		$ 4	$ 3

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