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Note 8 - Deferred Revenue (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Movement In Deferred Revenue Roll Forward  
Deferred revenue on extended warranties $ 23
New extended warranty and maintenance arrangements in 2018 28
Recognition of extended warranty and maintenance arrangement revenue in 2018 (29)
Deferred revenue on extended warranties $ 22