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Note 5 - Gross Carrying Amount and Accumulated Amortization by Major Intangible Asset Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 71 $ 69
Intangible Assets Net 48  
Intangible assets gross 157 190
Intangible assets net 86 121
Trade Names [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 38 40
Technology-Based Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 105 122
Accumulated Amortization 64 57
Intangible Assets Net $ 41 $ 65
Weighted-Average Amortization Period 6 years 6 years
Customer-Related Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 11 $ 26
Accumulated Amortization 6 12
Intangible Assets Net $ 5 $ 14
Weighted-Average Amortization Period 6 years 6 years
Other Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 3 $ 2
Accumulated Amortization 1  
Intangible Assets Net $ 2 $ 2
Weighted-Average Amortization Period 21 years 21 years