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Earnings per share (Details) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 $ / shares | Dec. 31, 2024 BRL (R$) shares | Dec. 31, 2023 $ / shares | Dec. 31, 2023 BRL (R$) shares | Dec. 31, 2022 $ / shares | Dec. 31, 2022 BRL (R$) shares
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Total net income available to equity owners |  | R$ 41,085 |  | R$ 33,105 |  | R$ 29,207
Minimum non-cumulative dividends on preferred shares |  | (117) |  | (117) |  | (117)
Retained earnings to be distributed to common shares |  | (120) |  | (120) |  | (120)
Ordinary shares [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Total net income available to equity owners |  | 20,811 |  | 16,754 |  | 14,781
Retained earnings |  | R$ 20,691 |  | R$ 16,634 |  | R$ 14,661
Weighted average number of shares outstanding | shares |  | 5,454,119,395 |  | 5,454,119,395 |  | 5,454,119,395
Basic earnings per share | $ / shares | $ 3.82 |  | $ 3.07 |  | $ 2.71 |
Preference shares [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Total net income available to equity owners |  | R$ 20,274 |  | R$ 16,351 |  | R$ 14,426
Retained earnings |  | R$ 20,157 |  | R$ 16,234 |  | R$ 14,309
Weighted average number of shares outstanding | shares |  | 5,313,264,028 |  | 5,323,043,889 |  | 5,322,863,899
Basic earnings per share | $ / shares | $ 3.82 |  | $ 3.07 |  | $ 2.71 |

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