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Note 10 - Deferred Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Movement In Deferred Revenue Roll Forward    
Deferred revenue on extended warranties $ 27 $ 30
New extended warranty and maintenance arrangements 176 188
Recognition of extended warranty and maintenance arrangement revenue (177) (191)
Deferred revenue on extended warranties $ 26 $ 27