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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)

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