Note 12 - Guarantees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Guarantee Obligations [Line Items]
Deferred revenue on extended warranties as of December 31, 2019	$ 61
Recognition of extended warranty and maintenance arrangement revenue in 2020	(26)	$ (24)
Deferred revenue on extended warranties as of March 31, 2020	56
Extended Warranty Arrangements [Member]
Guarantee Obligations [Line Items]
Deferred revenue on extended warranties as of December 31, 2019	21
New extended warranty and maintenance arrangements in 2020	23
Recognition of extended warranty and maintenance arrangement revenue in 2020	(24)
Deferred revenue on extended warranties as of March 31, 2020	$ 20