Note 11 - Guarantees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 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	(24)	$ (25)
Deferred revenue on extended warranties as of March 31, 2019	45
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	25
Recognition of extended warranty and maintenance arrangement revenue in 2019	(26)
Deferred revenue on extended warranties as of March 31, 2019	$ 21