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Financial risk management - Market risk, Sensitivity analysis (Details) - Market risk - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Scenario I | IPCA Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | R$ (3,045) | R$ (3,267)
Scenario I | IGP-M Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (42) | (83)
Scenario I | Fixed |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (334) | (162)
Scenario I | TR Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (813) | (34)
Scenario II | IPCA Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (378) | (233)
Scenario II | IGP-M Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (6) | (8)
Scenario II | Fixed |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (183) | (30)
Scenario II | TR Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (23) | (5)
Scenario III | IPCA Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (658,147) | (44,207)
Scenario III | IGP-M Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (10,118) | (15,804)
Scenario III | Fixed |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | (551,209) | (56,739)
Scenario III | TR Coupon |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in profit or loss by increase (decrease) in risk factor | R$ (226,744) | R$ (9,801)

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