Note 7 - Leases - Summary of Income Recognized on Lease Arrangements (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lease income - operating leases:
Lease income		$ 3	$ 2	$ 7	$ 7
Variable lease income	[1]	1	2	4	4
Total lease income		$ 4	$ 4	$ 11	$ 11

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