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Note 11 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Amortization of Intangible Assets, Total $ 26 $ 29 $ 78 $ 86
Finite-Lived Intangible Asset, Expected Amortization, Year One 26   26  
Finite-Lived Intangible Asset, Expected Amortization, Year Two 100   100  
Finite-Lived Intangible Asset, Expected Amortization, Year Three 96   96  
Finite-Lived Intangible Asset, Expected Amortization, Year Four 90   90  
Finite-Lived Intangible Asset, Expected Amortization, Year Five 25   25  
Finite-Lived Intangible Assets, Amortization Expense, Year Six $ 15   $ 15