Note 12 - Guarantees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 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	$ (4)	$ (4)	(35)	$ (34)
Deferred revenue on extended warranties as of September 30, 2020	60		60
Extended Warranty Arrangements [Member]
Guarantee Obligations [Line Items]
Deferred revenue on extended warranties as of December 31, 2019			21
Extended warranty and maintenance arrangements deferred in 2020			68
Recognition of extended warranty and maintenance arrangement revenue in 2020			(70)
Deferred revenue on extended warranties as of September 30, 2020	$ 19		$ 19