Note 11 - Guarantees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Guarantee Obligations [Line Items]
Deferred revenue on extended warranties as of December 31, 2018			$ 48
Recognition of extended warranty and maintenance arrangement revenue in 2019	$ (4)	$ (1)	(34)	$ (29)
Deferred revenue on extended warranties as of September 30, 2019	61		61
Extended Warranty Arrangements [Member]
Guarantee Obligations [Line Items]
Deferred revenue on extended warranties as of December 31, 2018			22
New extended warranty and maintenance arrangements in 2019			73
Recognition of extended warranty and maintenance arrangement revenue in 2019			(75)
Deferred revenue on extended warranties as of September 30, 2019	$ 20		$ 20