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Financial and capital risk management - Sensitivity analysis of derivative financial instruments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Scenario I |  |
Derivative financial instruments. |  |
Percentage of deterioration of risk variables | 25.00% |
Scenario II |  |
Derivative financial instruments. |  |
Percentage of deterioration of risk variables | 50.00% |
CDI vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | $ (473) | $ (38)
CDI vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (473) |
CDI vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1,048) |
CDI vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1,623) |
CDI vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (473) |
CDI vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (494) |
CDI vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (517) |
CDI vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (473) |
CDI vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (496) |
CDI vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (522) |
TJLP vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | (163) | (77)
TJLP vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (163) |
TJLP vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (285) |
TJLP vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (408) |
TJLP vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (163) |
TJLP vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (165) |
TJLP vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (168) |
TJLP vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (163) |
TJLP vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (173) |
TJLP vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (182) |
TJLP vs. US$ fixed rate swap | TJLP interest rate decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (163) |
TJLP vs. US$ fixed rate swap | TJLP interest rate decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (172) |
TJLP vs. US$ fixed rate swap | TJLP interest rate decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (181) |
R$ fixed rate vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | (111) | (18)
R$ fixed rate vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (111) |
R$ fixed rate vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (264) |
R$ fixed rate vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (418) |
R$ fixed rate vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (111) |
R$ fixed rate vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (113) |
R$ fixed rate vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (115) |
R$ fixed rate vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (111) |
R$ fixed rate vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (120) |
R$ fixed rate vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (129) |
IPCA vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | (173) | $ 46
IPCA vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (173) |
IPCA vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (343) |
IPCA vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (512) |
IPCA vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (173) |
IPCA vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (178) |
IPCA vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (183) |
IPCA vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (173) |
IPCA vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (189) |
IPCA vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (204) |
IPCA vs. US$ fixed rate swap | IPCA index decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (173) |
IPCA vs. US$ fixed rate swap | IPCA index decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (184) |
IPCA vs. US$ fixed rate swap | IPCA index decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (195) |
IPCA vs. CDI swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 45 |
IPCA vs. CDI swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 43 |
IPCA vs. CDI swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 41 |
IPCA vs. CDI swap | IPCA index decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 45 |
IPCA vs. CDI swap | IPCA index decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 43 |
IPCA vs. CDI swap | IPCA index decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 40 |
US$ floating rate vs. US$ fixed rate swap | US$ Libor decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (7) |
US$ floating rate vs. US$ fixed rate swap | US$ Libor decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (10) |
US$ floating rate vs. US$ fixed rate swap | US$ Libor decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (13) |
Protected item: Libor US$ indexed debt | US$ Libor decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | 10 |
Protected item: Libor US$ indexed debt | US$ Libor decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | 13 |
NDF | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
NDF | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (39) |
NDF | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (77) |
NDF | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
NDF | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (2) |
NDF | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (3) |
NDF | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | (1) |
NDF | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | (7) |
NDF | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | (13) |
Protected item: R$ denominated debt linked to IPCA | IPCA index decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (43) |
Protected item: R$ denominated debt linked to IPCA | IPCA index decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (40) |
EUR fixed rate vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | (7) |
EUR fixed rate vs. US$ fixed rate swap | EUR depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
EUR fixed rate vs. US$ fixed rate swap | EUR depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (173) |
EUR fixed rate vs. US$ fixed rate swap | EUR depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (346) |
EUR fixed rate vs. US$ fixed rate swap | Euribor increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
EUR fixed rate vs. US$ fixed rate swap | Euribor increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (2) |
EUR fixed rate vs. US$ fixed rate swap | Euribor increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (3) |
EUR fixed rate vs. US$ fixed rate swap | US$ Libor decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
EUR fixed rate vs. US$ fixed rate swap | US$ Libor decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (2) |
EUR fixed rate vs. US$ fixed rate swap | US$ Libor decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (2) |
Protected item: EUR denominated debt | EUR depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 173 |
Protected item: EUR denominated debt | EUR depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 346 |
Bunker Oil protection - Forwards and options | Bunker Oil price decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | 80 |
Bunker Oil protection - Forwards and options | Bunker Oil price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | 25 |
Bunker Oil protection - Forwards and options | Bunker Oil price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (28) |
Protected item: Part of costs linked to bunker oil prices | Bunker Oil price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | (25) |
Protected item: Part of costs linked to bunker oil prices | Bunker Oil price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 28 |
Maritime Freight protection - Forwards | Freight price decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 4 |
Maritime Freight protection - Forwards | Freight price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (2) |
Maritime Freight protection - Forwards | Freight price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (7) |
Protected item: Part of costs linked to maritime freight prices | Freight price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 2 |
Protected item: Part of costs linked to maritime freight prices | Freight price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 7 |
Nickel sales fixed price protection - Forwards | Nickel price decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (19) |
Nickel sales fixed price protection - Forwards | Nickel price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (19) |
Nickel sales fixed price protection - Forwards | Nickel price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (19) |
Protected item: Part of nickel future revenues | Nickel price fluctuation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 19 |
Protected item: Part of nickel future revenues | Nickel price fluctuation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 19 |
Palladium Revenue Hedging Program - Options | Palladium price increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
Palladium Revenue Hedging Program - Options | Palladium price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (5) |
Palladium Revenue Hedging Program - Options | Palladium price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (9) |
Protected item: Part of palladium future revenues | Palladium price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | 5 |
Protected item: Part of palladium future revenues | Palladium price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | 9 |
Option - SPCs | Iron ore price decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 18 |
Option - SPCs | Iron ore price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 10 |
Option - SPCs | Iron ore price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 2 |
Embedded derivatives - Raw material purchase (nickel) | Nickel price increase | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 2 |
Embedded derivatives - Raw material purchase (nickel) | Nickel price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (5) |
Embedded derivatives - Raw material purchase (nickel) | Nickel price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (13) |
Embedded derivatives - Raw material purchase (copper) | Copper price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
Embedded derivatives - Raw material purchase (copper) | Copper price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (3) |
Embedded derivatives - Gas purchase | Pellet price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1) |
Embedded derivatives - Guaranteed minimum return (VLI) | VLI stock value decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (19) |
Embedded derivatives - Guaranteed minimum return (VLI) | VLI stock value decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (84) |
Embedded derivatives - Guaranteed minimum return (VLI) | VLI stock value decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | $ (270) |

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