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27 COMMITMENTS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
CommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | R$ 2,583,757 | R$ 1,096,086
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [Member] |  |
CommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 1,555,398 | 406,920
Minimum future payments of take-or-pay contracts | 7,868,985 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [Member] | 2020 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,184,627 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [Member] | 2021 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,106,047 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [Member] | 2022 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 1,136,469 |
Transportation of Iron Ore, Coal, Coke, Steel Products, Cement and Mining Products [Member] | After 2022 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 4,441,842 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon, Iron Ore Pellets, Coal and Clinquer [Member] |  |
CommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 966,405 | 658,166
Minimum future payments of take-or-pay contracts | 650,128 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon, Iron Ore Pellets, Coal and Clinquer [Member] | 2020 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 391,750 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon, Iron Ore Pellets, Coal and Clinquer [Member] | 2021 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 33,317 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon, Iron Ore Pellets, Coal and Clinquer [Member] | 2022 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 24,940 |
Supply of Power, Natural Gas, Oxygen, Nitrogen, Argon, Iron Ore Pellets, Coal and Clinquer [Member] | After 2022 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 200,121 |
Processing of Furnace Sludge and Slag Resulting from The production Process of Pig Iron and Steel[Member] |  |
CommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 56,024 | 9,467
Minimum future payments of take-or-pay contracts | 47,905 |
Processing of Furnace Sludge and Slag Resulting from The production Process of Pig Iron and Steel[Member] | 2020 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 21,164 |
Processing of Furnace Sludge and Slag Resulting from The production Process of Pig Iron and Steel[Member] | 2021 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 11,571 |
Processing of Furnace Sludge and Slag Resulting from The production Process of Pig Iron and Steel[Member] | 2022 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 11,571 |
Processing of Furnace Sludge and Slag Resulting from The production Process of Pig Iron and Steel[Member] | After 2022 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | 3,599 |
Manufacturing, Repair, Recovery and Production of Ingot Casting Machine Units [Member] |  |
CommitmentsLineItems [Line Items] |  |
Take-or-pay contracts | 5,930 | R$ 21,533
Minimum future payments of take-or-pay contracts | 1,896 |
Manufacturing, Repair, Recovery and Production of Ingot Casting Machine Units [Member] | 2020 [member] |  |
CommitmentsLineItems [Line Items] |  |
Minimum future payments of take-or-pay contracts | R$ 1,896 |

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