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Financial and capital risk management - Effects of derivatives on statement of financial position and Net exposure (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Financial instruments classification    
Current assets $ 214 $ 134
Non-current assets 208 66
Current liabilities 204 328
Non-current liabilities 521 689
Derivative financial assets (liabilities) (303) (817)
Derivatives not designated as hedge | Foreign exchange and interest rate risk    
Financial instruments classification    
Current assets 108 7
Non-current assets 192 50
Current liabilities 146 251
Non-current liabilities 511 689
Derivative financial assets (liabilities) (357) (883)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | CDI & TJLP vs. US$ fixed and floating rate swap    
Financial instruments classification    
Current assets 1  
Non-current assets 1  
Current liabilities 96 111
Non-current liabilities 408 525
Derivative financial assets (liabilities) (502) (636)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | IPCA swap    
Financial instruments classification    
Current assets 9 7
Non-current assets 42 38
Current liabilities   72
Non-current liabilities 92 100
Derivative financial assets (liabilities) (41) (127)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | Eurobonds Swap    
Financial instruments classification    
Non-current assets   3
Current liabilities   4
Derivative financial assets (liabilities)   (1)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | Pre-dollar swap and forward (NDF)    
Financial instruments classification    
Current assets 98  
Non-current assets 144 9
Current liabilities 48 63
Non-current liabilities 9 58
Derivative financial assets (liabilities) 185 (112)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | Libor swap    
Financial instruments classification    
Non-current assets 5  
Current liabilities 2 1
Non-current liabilities 2 6
Derivative financial assets (liabilities) 1 (7)
Derivatives not designated as hedge | Commodities price risk    
Financial instruments classification    
Current assets 106 127
Non-current assets 1  
Current liabilities 48 59
Non-current liabilities 10  
Derivative financial assets (liabilities) 49 68
Derivatives not designated as hedge | Commodities price risk | Base metals products    
Financial instruments classification    
Current assets 6 30
Non-current assets 1  
Current liabilities 46 46
Derivative financial assets (liabilities) (39) (16)
Derivatives not designated as hedge | Commodities price risk | Gasoil Brent and Freight    
Financial instruments classification    
Current assets 100 97
Current liabilities   13
Derivative financial assets (liabilities) 100 84
Derivatives not designated as hedge | Commodities price risk | Thermal coal    
Financial instruments classification    
Current liabilities 2  
Non-current liabilities 10  
Derivative financial assets (liabilities) (12)  
Derivatives not designated as hedge | Others    
Financial instruments classification    
Non-current assets 15 16
Derivative financial assets (liabilities) 5 (2)
Derivatives not designated as hedge | Others | Others    
Financial instruments classification    
Non-current assets 15 16
Current liabilities 10 18
Derivative financial assets (liabilities) $ 5 $ (2)