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Cash and cash equivalents - Reverse repurchase agreements (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of financial assets [line items] |  |
Total Reverse repurchase agreements | R$ 35,591 | R$ 1,652,697
Financial Treasury Letters (LFT) |  |
Disclosure of financial assets [line items] |  |
Total Reverse repurchase agreements |  | 412,492
National Financial Treasury Letters (LTN) |  |
Disclosure of financial assets [line items] |  |
Total Reverse repurchase agreements | 30,448 | R$ 1,240,205
National Treasury Bonds (NTN) |  |
Disclosure of financial assets [line items] |  |
Total Reverse repurchase agreements | 1,048 |
Bank deposit certificates |  |
Disclosure of financial assets [line items] |  |
Total Reverse repurchase agreements | R$ 4,095 |

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