Note 16 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Feb. 21, 2020	Dec. 31, 2019
Schedule Of Income Taxes [Line Items]
U.S. corporate income tax rate	21.00%		21.00%	21.00%	21.00%
Deferred Tax Assets, Valuation Allowance							$ 821
Foreign Tax Authority [Member]
Schedule Of Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance							168
Deferred Tax Assets, Net of Valuation Allowance							322
Domestic Tax Authority [Member]
Schedule Of Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance							653
Deferred Tax Assets, Net of Valuation Allowance							$ 633
Domestic Tax Authority [Member] | IRS [Member]
Schedule Of Income Taxes [Line Items]
Liability for Uncertain Tax Positions, Current						$ 41
Valuation Allowance of Deferred Tax Assets [Member]
Schedule Of Income Taxes [Line Items]
Provision associated with establishment of valuation allowance on deferred tax assets		$ 167		$ 167