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Note 6 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Jul. 28, 2020
Restricted Cash $ 109    
U S International Development Finance Corporation [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 765
BRAZIL      
Restricted Cash and Investments, Noncurrent 7 $ 8  
Federal And State Value Added Taxes Litigations And Civil Litigation And Disputes With Former Employees [Member] | BRAZIL      
Loss Contingency, Accrual, Reserve Maintained 3    
Aggregate Claims 85    
Loss Contingency, Estimate of Possible Loss 5    
Threat of Expropriation of Assets [Member] | BRAZIL      
Restricted Cash and Investments, Noncurrent 7    
Assets, Noncurrent 39    
Bank Guarantees And Letters Of Credit [Member]      
Guarantor Obligations, Maximum Exposure, Undiscounted 1    
Surety Bond [Member]      
Guarantor Obligations, Maximum Exposure, Undiscounted 27    
L C Facility Agreement [Member]      
Letters of Credit Outstanding, Amount $ 27