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CONSOLIDATED FINANCIAL STATEMENTS - Joint ventures (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Joint ventures |  |  |  |
Net income (loss) |  | R$ 15,558,938 | R$ 2,388,054 | R$ 1,216,887
Total comprehensive income (loss) |  | 16,812,883 | 4,653,996 | 1,589,369
Results in operations with subsidiary and joint ventures (note 3.4) |  | 511,514 |  |
Amount of the additional interest |  | 511,514 |  |
Joint ventures |  |  |  |
Joint ventures |  |  |  |
Net income (loss) |  | 959,116 | 249,158 | (21,548)
Total comprehensive income (loss) |  | R$ 959,116 | R$ 249,158 | R$ (21,548)
Bradley Steel Processors |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) | [1] | 50.00% | 50.00% | 50.00%
MRM Guide Rail |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) | [1] | 50.00% | 50.00% | 50.00%
Gerdau Corsa S.A.P.I de C.V. |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) | [1] | 75.00% | 70.00% | 70.00%
Capital increase |  |  |  | R$ 463,990
Results in operations with subsidiary and joint ventures (note 3.4) |  | R$ 511,514 |  |
Amount of the additional interest |  | R$ 511,514 |  |
Gerdau Corsa S.A.P.I de C.V. | Minimum |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) |  | 70.00% |  |
Gerdau Corsa S.A.P.I de C.V. | Maximum |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) |  | 75.00% |  |
Gerdau Metaldom Corp. |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) | [1] | 50.00% | 50.00% | 50.00%
Gerdau Summit Acos Fundidos e Forjados S.A. |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) | [1] | 58.73% | 58.73% | 58.73%
Diaco S.A. |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) | [1] | 49.87% | 49.87% | 49.87%
Juntos Somos Mais Fidelizacao S.A. |  |  |  |
Joint ventures |  |  |  |
Equity Interests (as a percent) | [1] | 27.50% | 27.50% | 27.50%
[1] | The voting capital is substantially equal to the total capital. The interests reported represent the ownership percentage held directly and indirectly held in the joint venture.

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