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Schedule of net liabilities in relation to its equity (Details) - BRL (R$) R$ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
IfrsStatementLineItems [Line Items] |  |  |  |
Options in shares | R$ 636 | R$ 533 |  |
Total liabilities | 32,584 | 36,605 |  |
Cash and cash equivalents | 825 | 1,680 |  |
Total equity | 19,462 | 17,478 | R$ 16,103 | R$ 16,084
Capital management [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Total liabilities | 32,584 | 36,605 |  |
Cash and cash equivalents | (825) | (1,680) |  |
Restricted cash | (19) | (64) |  |
Net liabilities | 31,740 | 34,861 |  |
Total equity | R$ 19,462 | R$ 17,478 |  |
Net liabilities / equity | 1.62% | 1.99% |  |
S A A G [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Options in shares | R$ 636 | R$ 536 |  |
Sonda [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Options in shares |  | R$ (3) |  |

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