Note 10 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amortization of Intangible Assets, Total	$ 26	$ 28	$ 52	$ 57
Finite-Lived Intangible Asset, Expected Amortization, Year One	51		51
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