Note 10 - Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
UNITED STATES | Pension Plan [Member]
Interest cost	$ 3	$ 5
Expected return on plan assets	(7)	(9)
Amortization of net actuarial (gain) loss	2	3
Net periodic benefit cost (credit)	(2)	(1)
Foreign Plan [Member] | Pension Plan [Member]
Interest cost	1	1
Expected return on plan assets		(1)
Service cost	2	2
Amortization of net actuarial (gain) loss	2	2
Net periodic benefit cost (credit)	5	4
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Interest cost	1	1
Net periodic benefit cost (credit)	$ 1	$ 1