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Financial and capital risk management - Effects of derivatives on statement of financial position and Net exposure (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financial instruments classification    
Current assets $ 134 $ 288
Non-current assets 66 184
Current liabilities 328 94
Non-current liabilities 689 307
Derivative financial assets (liabilities) $ (817) 71
Percentage of risk estimate 95.00%  
Others    
Financial instruments classification    
Derivative financial assets (liabilities) $ (2) (77)
Derivatives not designated as hedge    
Financial instruments classification    
Current assets 134 288
Non-current assets 66 184
Current liabilities 328 94
Non-current liabilities 689 307
Derivatives not designated as hedge | Others    
Financial instruments classification    
Non-current assets 16 50
Derivative financial assets (liabilities) (2) (77)
Derivatives not designated as hedge | Foreign exchange and interest rate risk    
Financial instruments classification    
Current assets 7 117
Non-current assets 50 125
Current liabilities 251 75
Non-current liabilities 689 183
Derivative financial assets (liabilities) (883) (16)
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   13
Current liabilities 111 48
Non-current liabilities 525 80
Derivative financial assets (liabilities) (636) (115)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | IPCA swap    
Financial instruments classification    
Current assets 7 82
Non-current assets 38 117
Current liabilities 72 13
Non-current liabilities 100 37
Derivative financial assets (liabilities) (127) 149
Derivatives not designated as hedge | Foreign exchange and interest rate risk | Eurobonds Swap    
Financial instruments classification    
Non-current assets 3  
Current liabilities 4 6
Non-current liabilities   29
Derivative financial assets (liabilities) (1) (35)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | Pre-dollar swap    
Financial instruments classification    
Current assets   21
Non-current assets 9 8
Current liabilities 62 8
Non-current liabilities 58 37
Derivative financial assets (liabilities) (111) (16)
Derivatives not designated as hedge | Foreign exchange and interest rate risk | Libor swap    
Financial instruments classification    
Current liabilities 1  
Non-current liabilities 6  
Derivative financial assets (liabilities) (7)  
Derivatives not designated as hedge | Foreign exchange and interest rate risk | Forward transactions    
Financial instruments classification    
Current assets   1
Current liabilities 1  
Derivative financial assets (liabilities) (1) 1
Derivatives not designated as hedge | Commodities price risk    
Financial instruments classification    
Current assets 127 171
Non-current assets   9
Current liabilities 59 12
Non-current liabilities   4
Derivative financial assets (liabilities) 68 164
Derivatives not designated as hedge | Commodities price risk | Nickel    
Financial instruments classification    
Current assets 30 151
Non-current assets   9
Current liabilities 46 4
Non-current liabilities   4
Derivatives not designated as hedge | Commodities price risk | Bunker oil, Gasoil and Brent    
Financial instruments classification    
Current assets 97 20
Current liabilities 13 8
Derivatives not designated as hedge | Commodities price risk | Base metals products    
Financial instruments classification    
Derivative financial assets (liabilities) (16) 152
Derivatives not designated as hedge | Commodities price risk | Gasoil Brent and Freight    
Financial instruments classification    
Derivative financial assets (liabilities) 84 12
Derivatives not designated as hedge | Others    
Financial instruments classification    
Non-current assets 16 50
Current liabilities 18 7
Non-current liabilities   120
Derivatives not designated as hedge | Others | Others    
Financial instruments classification    
Current liabilities $ 18 7
Non-current liabilities   $ 120