Note 12 - Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Settlement charge	$ 258		$ 259
UNITED STATES | Pension Plan [Member]
Interest cost		21	40	43
Expected return on plan assets		(35)	(51)	(71)
Amortization of net actuarial (gain) loss		11	22	28
Settlement charge			256
Net periodic benefit cost (credit)		(3)	267
Amount due to net actuarial (gains) losses		(4)	(107)	11
Reclassification adjustment for net actuarial losses in net periodic benefit cost		(11)	(278)	(28)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Amount due to net actuarial (gains) losses		1	1
Net recognized in benefit cost (credit) and OCI		1	1
Net recognized in benefit cost (credit) and OCI		1	1
Foreign Plan [Member] | Pension Plan [Member]
Interest cost		5	8	7
Expected return on plan assets		(3)	(3)	(3)
Service cost		9	8	7
Amortization of net actuarial (gain) loss		9	6	6
Settlement charge			3
Curtailment			(1)
Other				2
Net periodic benefit cost (credit)		20	21	19
Amount due to net actuarial (gains) losses		10	33	4
Reclassification adjustment for net actuarial losses in net periodic benefit cost		(9)	(9)	(6)
Other
Net recognized in benefit cost (credit) and OCI				(18)
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Interest cost		2	3	3
Service cost		1		1
Amortization of net actuarial (gain) loss			(1)
Net periodic benefit cost (credit)		3	2	4
Amount due to net actuarial (gains) losses		4	2	(7)
Reclassification adjustment for net actuarial losses in net periodic benefit cost			1
Net recognized in benefit cost (credit) and OCI		4	3	(7)
Net recognized in benefit cost (credit) and OCI		$ 7	$ 5	$ (3)