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Note 5 - Estimated Future Amortization Expense Related to Intangible Assets (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Intangible Assets Gross Excluding Goodwill [Abstract]  
2016 $ 21
2017 19
2018 14
2019 7
2020 5
2021 and thereafter 7
Total $ 73