Note 10 - Summary of Income Recognized on Operating Lease Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease income - operating leases:
Lease income	$ 2	$ 3	$ 6	$ 7
Sublease income		1	2	5
Variable lease income	1	1	3	3
Total lease income	$ 3	$ 5	$ 11	$ 15