Note 4 - Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 14	$ 29	$ 26
Charges to restructuring	36	31	32
Adjustments of accruals	(2)	(2)	(7)
Cash payments	(19)	(40)	(21)
Currency impact	1	0	(1)
Lease cease-use reclassification		(4)
Balance	30	14	29
Employee Termination Benefits [Member]
Balance	13	25	21
Charges to restructuring	30	21	28
Adjustments of accruals	(2)	(2)	(7)
Cash payments	(12)	(31)	(16)
Currency impact	1		(1)
Balance	30	13	25
Exit Costs [Member]
Balance	1	4	5
Charges to restructuring	6	10	4
Cash payments	(7)	(9)	(5)
Lease cease-use reclassification		(4)
Balance	$ 0	$ 1	$ 4