Note 10 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Millions		3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Amortization of Intangible Assets, Total	$ 26	$ 26	$ 29
Finite-Lived Intangible Asset, Expected Amortization, Year One	77	77
Finite-Lived Intangible Assets, Amortization Expense, Year Two	98	98
Finite-Lived Intangible Assets, Amortization Expense, Year Three	94	94
Finite-Lived Intangible Assets, Amortization Expense, Year Four	88	88
Finite-Lived Intangible Assets, Amortization Expense, Year Five	24	24
Finite-Lived Intangible Assets, Amortization Expense, Year Six	$ 15	$ 15