Note 10 - Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
UNITED STATES | Pension Plan [Member]
Interest cost	$ 5	$ 9
Expected return on plan assets	(9)	(12)
Amortization of net actuarial loss	3	5
Net periodic benefit cost	(1)	2
UNITED STATES | Other Postretirement Benefits Plan [Member]
Interest cost	0
Net periodic benefit cost	0
Foreign Plan [Member] | Pension Plan [Member]
Interest cost	1	2
Expected return on plan assets	(1)	(1)
Service cost	2	2
Amortization of net actuarial loss	2	2
Net periodic benefit cost	4	5
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Interest cost	1	1
Net periodic benefit cost	$ 1	$ 1