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Financial assets at fair value through other comprehensive income - Securities (Details) - BRL (R$) R$ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | R$ 128,014 | R$ 128,014 | R$ 108,555
Fair value adjustments (in stockholders' equity) |  | (6,848) | (2,849)
Fair value | 121,052 | 121,052 | 105,622
Expected loss |  | (114) | (84)
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients | 58,300 | 58,300 | 46,723
Brazilian government securities [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 73,554 | 73,554 | 71,298
Fair value adjustments (in stockholders' equity) |  | (2,571) | (1,656)
Fair value | 70,983 | 70,983 | 69,642
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients | 50,918 | 50,918 | 43,560
Brazilian government securities [member] | Other [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 36 | 36 | 36
Expected loss |  | (36) | (36)
Government Securities [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 38,397 | 38,397 | 30,507
Fair value adjustments (in stockholders' equity) |  | (486) | (313)
Fair value | 37,910 | 37,910 | 30,194
Expected loss |  | (1) |
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients | 6,662 | 6,662 | 2,385
Government Securities [member] | Argentina [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 2,791 | 2,791 | 409
Fair value adjustments (in stockholders' equity) |  | (11) | (4)
Fair value | 2,780 | 2,780 | 405
Government Securities [member] | Colombia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 1,766 | 1,766 | 1,942
Fair value adjustments (in stockholders' equity) |  | (284) | (95)
Fair value | 1,482 | 1,482 | 1,847
Government Securities [member] | Chile [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 18,358 | 18,358 | 19,885
Fair value adjustments (in stockholders' equity) |  | (129) | (151)
Fair value | 18,229 | 18,229 | 19,734
Government Securities [member] | United States [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 9,104 | 9,104 | 4,520
Fair value adjustments (in stockholders' equity) |  | (49) | (2)
Fair value | 9,055 | 9,055 | 4,518
Government Securities [member] | Mexico [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 760 | 760 | 1,028
Fair value adjustments (in stockholders' equity) |  | (3) | (6)
Fair value | 757 | 757 | 1,022
Government Securities [member] | Paraguay [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 3,362 | 3,362 | 1,516
Fair value adjustments (in stockholders' equity) |  | 3 | (57)
Fair value | 3,364 | 3,364 | 1,459
Expected loss | (1) |  |
Government Securities [member] | Switzerland [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 1,356 | 1,356 |
Fair value adjustments (in stockholders' equity) |  | (11) |
Fair value | 1,345 | 1,345 |
Government Securities [member] | Uruguay [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 900 | 900 | 1,207
Fair value adjustments (in stockholders' equity) |  | (2) | 2
Fair value | 898 | 898 | 1,209
Corporate Debt Securitie [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 16,027 | 16,027 | 6,714
Fair value adjustments (in stockholders' equity) |  | (3,791) | (880)
Fair value | 12,159 | 12,159 | 5,786
Expected loss |  | (77) | (48)
Corporate Debt Securitie [Member] | Other [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 707 | 707 | 57
Fair value adjustments (in stockholders' equity) |  | (8) | 3
Fair value | 695 | 695 | 57
Expected loss |  | (4) | (3)
Corporate Debt Securitie [Member] | Shares [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 8,571 | 8,571 | 1,629
Fair value adjustments (in stockholders' equity) |  | (3,686) | (886)
Fair value | 4,885 | 4,885 | 743
Corporate Debt Securitie [Member] | Rural Product Note [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 373 | 373 |
Fair value adjustments (in stockholders' equity) |  | 18 |
Fair value | 390 | 390 |
Expected loss |  | (1) |
Corporate Debt Securitie [Member] | Bank Deposit Certificates [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 714 | 714 | 132
Fair value adjustments (in stockholders' equity) |  |  | (1)
Fair value | 714 | 714 | 131
Corporate Debt Securitie [Member] | Debentures [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 1,231 | 1,231 | 392
Fair value adjustments (in stockholders' equity) |  | (3) | 3
Fair value | 1,183 | 1,183 | 351
Expected loss |  | (45) | (44)
Corporate Debt Securitie [Member] | Eurobonds and others [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 4,418 | 4,418 | 4,498
Fair value adjustments (in stockholders' equity) |  | (112) | 1
Fair value | 4,279 | 4,279 | 4,498
Expected loss |  | (27) | (1)
Corporate Debt Securitie [Member] | Financial bills [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gross carrying amount | 13 | 13 | 6
Fair value | 13 | 13 | 6
Corporate Securities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Financial assets at fair value through other comprehensive income-Securities pledged in guarantee of funding transactions of financial institutions and clients | R$ 720 | R$ 720 | R$ 778

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