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31. COMMITMENTS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | R$ 2,108,961 | R$ 2,603,716
Minimum future payments of take-or-pay contracts | 8,287,106 |
2021 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 1,913,292 |
2022 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 1,262,324 |
2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 1,251,927 |
After 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 3,859,563 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 946,865 | 1,555,398
Minimum future payments of take-or-pay contracts | 7,062,394 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [member] | 2021 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,195,158 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [member] | 2022 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,195,508 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [member] | 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,195,508 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [member] | After 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 3,476,220 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon and Iron Ore Pellets [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 1,044,380 | 959,362
Minimum future payments of take-or-pay contracts | 918,971 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon and Iron Ore Pellets [member] | 2021 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 674,378 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon and Iron Ore Pellets [member] | 2022 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 28,530 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon and Iron Ore Pellets [member] | 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 24,779 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon and Iron Ore Pellets [member] | After 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 191,284 |
Processing of slag generated during pig iron and steel production [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 75,863 | 56,024
Minimum future payments of take-or-pay contracts | 25,190 |
Processing of slag generated during pig iron and steel production [member] | 2021 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 13,240 |
Processing of slag generated during pig iron and steel production [member] | 2022 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 9,298 |
Processing of slag generated during pig iron and steel production [member] | 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 2,652 |
Processing of slag generated during pig iron and steel production [member] | After 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 0 |
Manufacturing, Repair, Recovery and Production of Ingot Casting Machine Units [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 7,674 | 5,930
Minimum future payments of take-or-pay contracts | 480 |
Manufacturing, Repair, Recovery and Production of Ingot Casting Machine Units [member] | 2021 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 480 |
Oil Storage and Handling [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 1,900 |
Minimum future payments of take-or-pay contracts | 5,226 |
Oil Storage and Handling [member] | 2021 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,608 |
Oil Storage and Handling [member] | 2022 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,608 |
Oil Storage and Handling [member] | 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,608 |
Oil Storage and Handling [member] | After 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 402 |
Labor and Consultancy Services [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 32,279 | R$ 27,002
Minimum future payments of take-or-pay contracts | 274,845 |
Labor and Consultancy Services [member] | 2021 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 28,428 |
Labor and Consultancy Services [member] | 2022 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 27,380 |
Labor and Consultancy Services [member] | 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 27,380 |
Labor and Consultancy Services [member] | After 2023 [member] |  |
DisclosureOfCommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | R$ 191,657 |

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