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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies [Line Items]      
Operating Leases, Rent Expense, Net $ 23 $ 25 $ 30
BRAZIL      
Commitments And Contingencies [Line Items]      
Restricted Cash 6 7  
Federal and State Value added Taxes Litigations [Member] | BRAZIL      
Commitments And Contingencies [Line Items]      
Loss Contingency, Estimate of Possible Loss 24    
Threat of Expropriation of Assets [Member] | BRAZIL      
Commitments And Contingencies [Line Items]      
Assets, Noncurrent 71    
Threat of Expropriation of Assets [Member] | BRAZIL | Cash [Member]      
Commitments And Contingencies [Line Items]      
Restricted Cash 6    
Amended Credit Agreement [Member]      
Commitments And Contingencies [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 96    
Restricted Cash 6 $ 25  
Bank Guarantees and Letters of Credit [Member]      
Commitments And Contingencies [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 4    
Surety Bond [Member]      
Commitments And Contingencies [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 52    
Restricted Cash and Deposits [Member]      
Commitments And Contingencies [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 31