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Note 11 - Guarantees (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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 $ (5) $ (4) (30) $ (27)
Deferred revenue on extended warranties as of June 30, 2019 56   56  
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     49  
Recognition of extended warranty and maintenance arrangement revenue in 2019     (51)  
Deferred revenue on extended warranties as of June 30, 2019 $ 20   $ 20