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Note 7 - Deferred Revenue (Details)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Movement In Deferred Revenue Roll Forward  
Deferred revenue on extended warranties $ 26
New extended warranty and maintenance arrangements in 2016 84
Recognition of extended warranty and maintenance arrangement revenue in 2016 (86)
Deferred revenue on extended warranties $ 24