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Note 15 - Summary of Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share Basic [Line Items]                
Net income (loss) $ 8 $ 16 $ 6 $ (445) $ (5) $ (111) $ 30 $ (561)
Net income (loss) available to common shareholders - basic and diluted $ 5     $ (450)     $ 31 $ (576)
Basic 78.6     64.8     78.3 50.8
Effect of dilutive securities                
Weighted average shares — diluted 80.6     64.8     80.5 50.8
Employee Stock Option [Member]                
Effect of dilutive securities                
Effect of dilutive securities 1.9           2.1  
Unvested Restricted Stock Units [Member]                
Effect of dilutive securities                
Effect of dilutive securities 0.1           0.1  
Series B Preferred Stock [Member]                
Earnings Per Share Basic [Line Items]                
Less: preferred stock cash and deemed dividends $ (1)           $ (3)  
Series C Preferred Stock [Member]                
Earnings Per Share Basic [Line Items]                
Less: preferred stock in-kind and deemed dividends $ (2)           (4)  
Series A Preferred Stock [Member]                
Earnings Per Share Basic [Line Items]                
Less: preferred stock cash and deemed dividends       $ (5)     (3) $ (15)
Plus: Expiration of Series A preferred stock embedded derivative             $ 11