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Note 5 - Estimated Future Amortization Expense Related to Intangible Assets (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Intangible Assets Gross Excluding Goodwill [Abstract]  
2020 $ 6
2021 5
2022 5
2023 4
2024 4
2025 and thereafter 2
Intangible Assets Net $ 26