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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended
Aug. 31, 2005
USD ($)
Mar. 31, 2019
USD ($)
claim
defendant
case
Mar. 31, 2019
BRL (R$)
claim
case
Dec. 31, 2018
USD ($)
Apr. 08, 2016
USD ($)
Commitments and Contingencies          
Minority interest   35.00% 35.00%    
Reserve for loss contingencies   $ 7,000,000.0      
Penalties per day   1,300 R$ 5,000    
Lima Refinery Litigation          
Commitments and Contingencies          
Loss contingency damages sought         $ 317,000,000
NETHERLANDS          
Commitments and Contingencies          
Damages sought - interest, penalties and fees   300,000      
Brazilian Tax Disputes - Jan 2004 through May 2005 | Sao Paulo State Revenue Authority          
Commitments and Contingencies          
Damages sought - principal   2,000,000      
Damages sought - interest, penalties and fees   21,000,000      
Loss Contingency, Reduced Penalty   2,000,000      
Amount of damages sought   9,000,000      
Brazilian Tax Disputes - Jan 2002 through Dec 2003 | Sao Paulo State Revenue Authority          
Commitments and Contingencies          
Damages sought - principal $ 1,500,000        
Damages sought - interest, penalties and fees 4,900,000        
Loss Contingency, Reduced Penalty 1,200,000        
Loss Contingency, Reduced Penalty, Including Interest 10,000,000        
Amount of damages sought $ 6,500,000        
Brazilian Labor Claims          
Commitments and Contingencies          
Loss contingency reserves   $ 7,000,000.0   $ 7,100,000  
Other          
Commitments and Contingencies          
Approximate number of defendants that includes the company named in legal actions | defendant   90      
Number of pending claims | claim   17,127 17,127    
Number of claims dismissed to date by stipulation or summary judgment prior to trial | case   28,189      
Other | Active or In Extremis docket          
Commitments and Contingencies          
Number of pending claims | claim   36 36    
Other | Minimum          
Commitments and Contingencies          
Amount of damages sought   $ 20,000,000      
Other | Maximum          
Commitments and Contingencies          
Amount of damages sought   $ 25,000,000      
Other | New York County as managed by the New York Supreme Court          
Commitments and Contingencies          
Number of pending claims | case   16,586 16,586    
Other | New York County as managed by the New York Supreme Court | Pending And Future Litigation, Deferred Or Inactive Docket          
Commitments and Contingencies          
Number of pending claims | claim   16,550 16,550    
Other | New York State Supreme Court, Counties Excluding New York County          
Commitments and Contingencies          
Number of pending claims | case   119 119    
Other | Courts Located In States Other Than New York          
Commitments and Contingencies          
Number of pending claims | case   422 422    
CSN [Member]          
Commitments and Contingencies          
Penalties per day | R$     R$ 20,000