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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, 2021
Dec. 31, 2020
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Accumulated Amortization $ 92 $ 89
Intangible Assets Net 16  
Intangible assets gross 126 128
Intangible assets net 34 39
Trade Names [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 18 18
Technology-Based Intangible Assets [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 99 99
Accumulated Amortization 84 80
Intangible Assets Net $ 15 $ 19
Weighted-Average Amortization Period 4 years 5 years
Customer-Related Intangible Assets [Member]    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 9 $ 11
Accumulated Amortization 8 9
Intangible Assets Net $ 1 $ 2
Weighted-Average Amortization Period 2 years 3 years