Note 9 - Leases - Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating lease expense	$ 3	$ 3	$ 6	$ 6
Short-term lease expense	0	0	1	1
Total lease expense	$ 3	$ 3	$ 7	$ 7