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Note 16 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Feb. 21, 2020
Dec. 31, 2019
Schedule Of Income Taxes [Line Items]        
U.S. corporate income tax rate 21.00% 21.00%    
Deferred Tax Assets, Valuation Allowance       $ 821
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      
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