Financial and capital risk management - Sensitivity analysis of derivative financial instruments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 |
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) | |