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Commitments (Detail) R$ in Thousands, MMBTU in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 BRL (R$) MMBTU | Dec. 31, 2020 BRL (R$) | May 27, 2020 BRL (R$)
Comgas [member] | Natural gas distribution [member] |  |  |
Disclosure of detailed information about commitments [line items] |  |  |
Financial commitment in an estimated present value | R$ 7,745,842 |  |
Rumo S.A. [member] | Port elevation [member] |  |  |
Disclosure of detailed information about commitments [line items] |  |  |
Financial commitment in an estimated present value | 340,000 |  |
Investments at cost | 270,629 | R$ 270,629 |
Rumo Malha Paulista S.A. [member] |  |  |
Disclosure of detailed information about commitments [line items] |  |  |
Estimated investments to be made for sub-concession contracts | 6,100,000 |  | R$ 6,100,000
Obligations of estimated investments for sub-concession contracts | R$ 3,000,000 |  |
Percentage of physical execution | 16.00% |  |
Rumo Malha Central S.A. [member] |  |  |
Disclosure of detailed information about commitments [line items] |  |  |
Estimated investments to be made for sub-concession contracts | R$ 645,573 |  |
Percentage of physical execution | 65.00% | 56.00% |
Rumo Malha Central S.A. [member] | Bottom of range [member] |  |  |
Disclosure of detailed information about commitments [line items] |  |  |
Contractual fixed term | 1 year |  |
Rumo Malha Central S.A. [member] | Top of range [member] |  |  |
Disclosure of detailed information about commitments [line items] |  |  |
Contractual fixed term | 3 years |  |
Compass Gas e Energia [Member] | Natural gas distribution [member] |  |  |
Disclosure of detailed information about commitments [line items] |  |  |
Contractual fixed term | 10 years |  |
Supply capacity committed | MMBTU | 120 |  |

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