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Financial and capital risk management - Sensitivity analysis of derivative financial instruments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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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 | $ (368) | $ (473)
CDI vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (368) |
CDI vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (900) |
CDI vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (1,433) |
CDI vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (368) |
CDI vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (396) |
CDI vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (425) |
CDI vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (368) |
CDI vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (402) |
CDI vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (437) |
TJLP vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | (134) | (163)
TJLP vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (134) |
TJLP vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (236) |
TJLP vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (338) |
TJLP vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (134) |
TJLP vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (137) |
TJLP vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (140) |
TJLP vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (134) |
TJLP vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (145) |
TJLP vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (155) |
TJLP vs. US$ fixed rate swap | TJLP interest rate decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (134) |
TJLP vs. US$ fixed rate swap | TJLP interest rate decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (141) |
TJLP vs. US$ fixed rate swap | TJLP interest rate decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (149) |
R$ fixed rate vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | 62 | (111)
R$ fixed rate vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 62 |
R$ fixed rate vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (246) |
R$ fixed rate vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (553) |
R$ fixed rate vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 62 |
R$ fixed rate vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 53 |
R$ fixed rate vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 45 |
R$ fixed rate vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 62 |
R$ fixed rate vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 19 |
R$ fixed rate vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (21) |
IPCA vs. US$ fixed rate swap |  |
Derivative financial instruments. |  |
Fair value of liabilities | (90) | $ (173)
IPCA vs. US$ fixed rate swap | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (90) |
IPCA vs. US$ fixed rate swap | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (199) |
IPCA vs. US$ fixed rate swap | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (307) |
IPCA vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (90) |
IPCA vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (96) |
IPCA vs. US$ fixed rate swap | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (103) |
IPCA vs. US$ fixed rate swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (90) |
IPCA vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (109) |
IPCA vs. US$ fixed rate swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (127) |
IPCA vs. US$ fixed rate swap | IPCA index decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (90) |
IPCA vs. US$ fixed rate swap | IPCA index decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (101) |
IPCA vs. US$ fixed rate swap | IPCA index decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (112) |
IPCA vs. CDI swap | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 49 |
IPCA vs. CDI swap | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 46 |
IPCA vs. CDI swap | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 44 |
IPCA vs. CDI swap | IPCA index decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 49 |
IPCA vs. CDI swap | IPCA index decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 47 |
IPCA vs. CDI swap | IPCA index decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 45 |
US$ floating rate vs. US$ fixed rate swap | US$ Libor decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 1 |
US$ floating rate vs. US$ fixed rate swap | US$ Libor decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (4) |
US$ floating rate vs. US$ fixed rate swap | US$ Libor decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (10) |
Protected item: Libor US$ indexed debt | US$ Libor decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 4 |
Protected item: Libor US$ indexed debt | US$ Libor decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 10 |
NDF | R$ depreciation | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 122 |
NDF | R$ depreciation | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (166) |
NDF | R$ depreciation | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (454) |
NDF | US$ interest rate inside Brazil decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 122 |
NDF | US$ interest rate inside Brazil decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 116 |
NDF | US$ interest rate inside Brazil decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 110 |
NDF | Brazilian interest rate increase | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 122 |
NDF | Brazilian interest rate increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 93 |
NDF | Brazilian interest rate increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 66 |
Protected item: R$ denominated debt linked to IPCA | IPCA index decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (47) |
Protected item: R$ denominated debt linked to IPCA | IPCA index decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (45) |
Fuel oil protection - Options | Price input decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 48 |
Fuel oil protection - Options | Price input decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 18 |
Fuel oil protection - Options | Price input decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 14 |
Protected item: Part of costs linked to fuel oil prices | Price input decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 18 |
Protected item: Part of costs linked to fuel oil prices | Price input decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 14 |
Forward Freight Agreement | Freight price decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 15 |
Forward Freight Agreement | Freight price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 5 |
Forward Freight Agreement | Freight price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (4) |
Protected item: Part of costs linked to maritime freight prices | Freight price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (5) |
Protected item: Part of costs linked to maritime freight prices | Freight price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 4 |
Protected item: Part of nickel revenues with fixed prices | Nickel price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (2) |
Protected item: Part of nickel revenues with fixed prices | Nickel price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (5) |
Nickel sales fixed price protection - Forwards | Nickel price decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 1 |
Nickel sales fixed price protection - Forwards | Nickel price decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (2) |
Nickel sales fixed price protection - Forwards | Nickel price decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (5) |
Nickel Revenue Hedging Program - Option | Nickel price increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (38) |
Nickel Revenue Hedging Program - Option | Nickel price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (160) |
Nickel Revenue Hedging Program - Option | Nickel price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (297) |
Protected item: Part of nickel future revenues | Nickel price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 160 |
Protected item: Part of nickel future revenues | Nickel price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 297 |
Palladium Revenue Hedging Program - Options | Palladium price increase | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 4 |
Palladium Revenue Hedging Program - Options | Palladium price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (23) |
Palladium Revenue Hedging Program - Options | Palladium price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (56) |
Protected item: Part of palladium future revenues | Palladium price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 23 |
Protected item: Part of palladium future revenues | Palladium price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 56 |
Thermal Coal Revenue Hedging Program - Option | Thermal coal price increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (11) |
Thermal Coal Revenue Hedging Program - Option | Thermal coal price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (40) |
Thermal Coal Revenue Hedging Program - Option | Thermal coal price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (69) |
Thermal Coal Revenue Hedging Program Protected item: Part of thermal coal future revenue | Thermal coal price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 40 |
Thermal Coal Revenue Hedging Program Protected item: Part of thermal coal future revenue | Thermal coal price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of assets | 69 |
Option - SPCs | SPCs stock value decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of assets | 15 |
Option - SPCs | SPCs stock value decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of assets | 5 |
Embedded derivatives - Raw material purchase (nickel) | Nickel price increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (3) |
Embedded derivatives - Raw material purchase (nickel) | Nickel price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (19) |
Embedded derivatives - Raw material purchase (nickel) | Nickel price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (34) |
Embedded derivatives - Raw material purchase (copper) | Copper price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (3) |
Embedded derivatives - Raw material purchase (copper) | Copper price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (6) |
Embedded derivatives - Gas purchase | Pellet price increase | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (4) |
Embedded derivatives - Gas purchase | Pellet price increase | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (8) |
Embedded derivatives - Gas purchase | Pellet price increase | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | (13) |
Embedded derivatives - Guaranteed minimum return (VLI) | SPCs stock value decrease | Probable |  |
Derivative financial instruments. |  |
Fair value of liabilities | (5) |
Embedded derivatives - Guaranteed minimum return (VLI) | SPCs stock value decrease | Scenario I |  |
Derivative financial instruments. |  |
Fair value of liabilities | (61) |
Embedded derivatives - Guaranteed minimum return (VLI) | SPCs stock value decrease | Scenario II |  |
Derivative financial instruments. |  |
Fair value of liabilities | $ (287) |

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