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Capital management and fair values of financial instruments - Additional information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
May 08, 2019
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]              
Resources from non-controlling interest, including capital increase         R$ 5,478,926 R$ 31,629 R$ 45,000
Other assets [Member] | Level 3 | Inter Seguros              
Disclosure of detailed information about financial instruments [line items]              
Ownership interest sold 40.00%            
Resources from non-controlling interest, including capital increase   R$ 45,000 R$ 45,000 R$ 45,000 R$ 45,000