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Note 4 - Long-term Debt - Aggregate Minimum Principal Maturities on Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Nov. 16, 2018
2020 $ 0    
2021 0    
2022 0    
2023 0    
2024 1,120    
Thereafter 2,640    
Total Debt 3,760 $ 2,570  
The 2019 Senior Credit Facility [Member]      
2020 0    
2021 0    
2022 0    
2023 0    
2024 595    
Thereafter 1,190    
Total Debt 1,785    
2024 Notes [Member]      
2020 0    
2021 0    
2022 0    
2023 0    
2024 525    
Thereafter 0    
Total Debt 525 525  
2026 Notes [Member]      
2020 0    
2021 0    
2022 0    
2023 0    
2024 0    
Thereafter 700    
Total Debt 700 700  
2027 Notes [Member]      
2020 0    
2021 0    
2022 0    
2023 0    
2024 0    
Thereafter 750    
Total Debt $ 750 $ 750 $ 750