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Risk and Capital Management - Summary of Collateral Held for Loan and Lease Operations Portfolio (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | R$ 452,496 | R$ 394,023
Fair value of collateral | 1,247,022 | 957,004
Carrying value of the assets | 43,232 | 48,709
Fair value of collateral | 31,992 | 37,682
Micro, small and medium companies and corporates |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 170,334 | 151,129
Fair value of collateral | 634,871 | 444,696
Carrying value of the assets | 32,436 | 31,582
Fair value of collateral | 26,933 | 27,011
Foreign loans - Latin America [member] | Foreign [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 168,968 | 161,987
Fair value of collateral | 330,020 | 309,489
Carrying value of the assets | 9,782 | 15,381
Fair value of collateral | 4,152 | 9,050
Individuals [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 113,194 | 80,907
Fair value of collateral | 282,131 | 202,819
Carrying value of the assets | 1,014 | 1,746
Fair value of collateral | 907 | 1,621
Individuals [member] | Vehicles [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 26,941 | 21,595
Fair value of collateral | 68,275 | 44,673
Carrying value of the assets | 368 | 999
Fair value of collateral | 318 | 918
Individuals [member] | Personal loan [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 2,436 | 1,960
Fair value of collateral | 8,338 | 6,759
Carrying value of the assets | 639 | 737
Fair value of collateral | 583 | 698
Individuals [member] | Mortgages [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 83,817 | 57,352
Fair value of collateral | 205,518 | 151,387
Carrying value of the assets | 7 | 10
Fair value of collateral | R$ 6 | R$ 5

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