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Note 5 - Estimated Future Amortization Expense Related to Intangible Assets (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Intangible Assets Gross Excluding Goodwill [Abstract]  
2018 $ 12
2019 7
2020 6
2021 5
2022 5
2023 and thereafter 13
Intangible Assets Net $ 48