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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
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share Basic [Line Items]    
Net income (loss) $ 6 $ (111)
Less: Preferred stock cash dividends (1) (3)
Less: Preferred stock deemed dividends (2) (2)
Less: Preferred stock in-kind dividend (1)  
Net income (loss) available to common shareholders - basic and diluted $ 13 $ (116)
Basic 77.8 43.6
Effect of dilutive securities    
Weighted average shares — diluted 80.6 43.6
Employee Stock Option [Member]    
Effect of dilutive securities    
Effect of dilutive securities 2.3  
Unvested Restricted Stock Units [Member]    
Effect of dilutive securities    
Effect of dilutive securities 0.5  
Series A Preferred Stock [Member]    
Earnings Per Share Basic [Line Items]    
Less: Preferred stock cash dividends   $ (3)
Less: Preferred stock deemed dividends   $ (2)
Plus: Expiration of Series A preferred stock embedded derivative $ 11