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Note 8 - Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Accumulated other comprehensive loss $ 347 $ 341 $ 617 $ 642 $ 671 $ 672 $ 678 $ 692
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]                
Accumulated other comprehensive loss (232)     (224)        
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
Accumulated other comprehensive loss (12)     (7)        
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                
Accumulated other comprehensive loss (1)     (1)        
AOCI Attributable to Parent [Member]                
Accumulated other comprehensive loss $ (245) $ (251) $ (259) $ (232) $ (241) $ (233) $ (231) $ (232)