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Investment - Summary of Balances and Changes in Associates (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of associates [line items] |  |  |
Associates, beginning | R$ 25,588 |  |
Associates, ending | 7,176 | R$ 25,588 |
Transportadora sulbrasileira de gas [member] |  |  |
Disclosure of associates [line items] |  |  |
Associates, beginning | 5,150 | 5,661 | R$ 4,689
Capital decrease | (1,500) |  |
Dividends | (998) | (2,357) | (818)
Share of profit (loss) of associates | 552 | (1,846) | 1,790
Share of profit (loss) of associates - discontinued operations | 0 | 0 | 0
Reclassification to assets held for sale | 0 |  |
Associates, ending | 3,204 | 5,150 | 5,661
Oxicap Industria de Gases [member] |  |  |
Disclosure of associates [line items] |  |  |
Associates, beginning | 16,348 | 15,934 | 15,366
Capital decrease | 0 |  |
Dividends | 0 | 0 | 0
Share of profit (loss) of associates | 0 | 0 | 0
Share of profit (loss) of associates - discontinued operations | 48 | 414 | 568
Reclassification to assets held for sale | (16,396) |  |
Associates, ending | 0 | 16,348 | 15,934
Quimica da Bahia Industria e Comercio S.A. [member] |  |  |
Disclosure of associates [line items] |  |  |
Associates, beginning | 3,542 | 3,554 | 3,590
Capital decrease | 0 |  |
Dividends | 0 | 0 | 0
Share of profit (loss) of associates | (14) | (12) | (36)
Share of profit (loss) of associates - discontinued operations | 0 | 0 | 0
Reclassification to assets held for sale | 0 |  |
Associates, ending | 3,528 | 3,542 | 3,554
Metalurgica plus [member] |  |  |
Disclosure of associates [line items] |  |  |
Associates, beginning | 47 | 138 | 228
Capital decrease | 0 |  |
Dividends | 0 | 0 | 0
Share of profit (loss) of associates | (100) | (91) | (90)
Share of profit (loss) of associates - discontinued operations | 0 | 0 | 0
Reclassification to assets held for sale | 0 |  |
Associates, ending | 53 | 47 | 138
Plenogas distribuidora de gas [member] |  |  |
Disclosure of associates [line items] |  |  |
Associates, beginning | 501 | 463 | 465
Capital decrease | 0 |  |
Dividends | 0 | 0 | (87)
Share of profit (loss) of associates | (4) | (38) | 85
Share of profit (loss) of associates - discontinued operations | 0 | 0 | 0
Reclassification to assets held for sale | 0 |  |
Associates, ending | 497 | 501 | 463
Associates [member] |  |  |
Disclosure of associates [line items] |  |  |
Associates, beginning | 25,588 | 25,750 | 24,338
Capital decrease | (1,500) |  |
Dividends | (998) | (2,357) | (905)
Share of profit (loss) of associates | 434 | (1,781) | 2,317
Share of profit (loss) of associates - discontinued operations | 48 | 414 | 0
Reclassification to assets held for sale | (16,396) |  |
Associates, ending | R$ 7,176 | R$ 25,588 | R$ 25,750

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