Note 10 - Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Settlement charge		$ 2	$ 258		$ 260
UNITED STATES | Pension Plan [Member]
Interest cost	6	7		16	33
Expected return on plan assets	(9)	(10)		(26)	(42)
Settlement charge					258
Amortization of net actuarial loss	2	3		8	18
Net periodic benefit cost (credit)	(1)	0		(2)	267
UNITED STATES | Other Postretirement Benefits Plan [Member]
Interest cost	0			0
Net periodic benefit cost (credit)	0			0
Foreign Plan [Member] | Pension Plan [Member]
Interest cost	1	1		4	5
Expected return on plan assets	(1)			(3)	(2)
Service cost	2	2		6	6
Settlement charge		2			2
Amortization of net actuarial loss	3	2		7	5
Net periodic benefit cost (credit)	5	7		14	16
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Interest cost	1	1		2	2
Net periodic benefit cost (credit)	$ 1	$ 1		$ 2	$ 2