Note 10 - Summary of Income Recognized on Operating Lease Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease income - operating leases:
Lease income	$ 2	$ 2	$ 4	$ 4
Sublease income		2	2	4
Variable lease income	1	1	2	2
Total lease income	$ 3	$ 5	$ 8	$ 10