Note 7 - Summary of Income Recognized on Operating Lease Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease income - operating leases:
Lease income	$ 2	$ 2	$ 4	$ 4
Sublease income				2
Variable lease income	1	1	2	2
Total lease income	$ 3	$ 3	$ 6	$ 8