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Note 9 - Stock Compensation (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based Payment Arrangement, Expense $ 4 $ 5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 39  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 2 months 12 days  
Performance Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.78%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 1.67%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 63.90%  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) 0.1  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid $ 4  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) 0.8