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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Feb. 21, 2020
Schedule Of Income Taxes [Line Items]              
U.S. corporate income tax rate 21.00% 21.00%   21.00% 21.00%    
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    
Foreign Tax Authority [Member]              
Schedule Of Income Taxes [Line Items]              
Liability for Uncertain Tax Positions, Current           $ 3  
Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued           $ 4  
Domestic Tax Authority [Member] | IRS [Member]              
Schedule Of Income Taxes [Line Items]              
Liability for Uncertain Tax Positions, Current             $ 41