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Intangibles - Early extension of railway concessions (Details) R$ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 BRL (R$) project item | Dec. 31, 2020 BRL (R$) km | Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Related concession grants liabilities | $ |  |  |  |  | $ 1,667 | $ 1,791
Discount rate for estimated cost of construction | 5.93% | 5.93% | 5.93% |  | 5.93% |
Guarantee insurance paid |  |  | R$ 1,026 | $ 197 |  |
Additional insurance policies based on certain contractual milestones |  |  | 1,000 | $ 192 |  |
Railways concessions |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Extension term for concessions |  | 30 years |  |  |  |
Intangible asset recognized, which represents its right to use | R$ 12,016 | R$ 12,016 | 12,016 |  | $ 2,312 |
Related concession grants liabilities | $ |  |  |  |  | 2,312 |
Railways concessions | Grants payments for the concessions |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Related concession grants liabilities | R$ 2,818 | R$ 2,818 | R$ 2,818 |  | $ 542 |
Discount rate for estimated cost of construction | 11.04% | 11.04% | 11.04% |  | 11.04% |
Railways concessions | Construction of the Midwest Integration Railway ("FICO") |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Related concession grants liabilities | R$ 6,789 | R$ 6,789 | R$ 6,789 |  | $ 1,306 |
Area of section to be constructed | km |  | 383 |  |  |  |
Construction period |  | 6 years |  |  |  |
Discount rate for estimated cost of construction | 2.59% | 2.59% | 2.59% |  | 2.59% |
Railways concessions | Infrastructure program |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Related concession grants liabilities | R$ 1,372 | R$ 1,372 | R$ 1,372 |  | $ 264 |
Number of separate projects | project | 450 |  |  |  |  |
Discount rate for estimated cost of construction | 3.08% | 3.08% | 3.08% |  | 3.08% |
Railways concessions | Acquisition and delivery of rails and sleepers |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Related concession grants liabilities | R$ 1,037 | R$ 1,037 | R$ 1,037 |  | $ 200 |
Discount rate for estimated cost of construction | 2.67% | 2.67% | 2.67% |  | 2.67% |
Estrada de Ferro Carajas ("EFC") | Railways concessions | Infrastructure program |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Number of municipalities will get benefited | item | 25 |  |  |  |  |
Ferro Vitoria a Minas ("EFVM") | Railways concessions | Infrastructure program |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |
Number of municipalities will get benefited | item | 33 |  |  |  |  |

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