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Note 6 - Guarantees (Tables)
 3 Months Ended
Mar. 31, 2016
Notes Tables  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
(in millions)        
Deferred revenue on extended warranties as of December 31, 2015
   $ 26  
New extended warranty and maintenance arrangements in 2016
     41  
Recognition of extended warranty and maintenance arrangement revenue in 2016
     (43
)
Deferred revenue on extended warranties as of March 31, 2016
   $ 24