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Note 8 - Stock Compensation (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-Based Payment Arrangement, Expense $ 5 $ 5 $ 19 $ 13
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 32   $ 32  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 10 months 24 days  
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     4.28%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate     2.50%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     67.00%  
Restricted Stock Units (RSUs) [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid     $ 5  
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)     1.2