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Note 8 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Commitments And Contingencies [Line Items]    
Restricted Cash $ 6 $ 7
Federal and State Value added Taxes Litigations [Member]    
Commitments And Contingencies [Line Items]    
Loss Contingency, Estimate of Possible Loss 52  
Threat of Expropriation of Assets [Member] | BRAZIL    
Commitments And Contingencies [Line Items]    
Assets, Noncurrent 72  
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   $ 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 53  
Restricted Cash Deposits [Member]    
Commitments And Contingencies [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted $ 25