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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, 2019 | Dec. 31, 2018
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | R$ 304,896 | R$ 287,444
Fair value of collateral | 703,388 | 685,961
Carrying value of the assets | 20,442 | 26,166
Fair value of collateral | 10,850 | 15,018
Very small, small and middle-market companies and corporates [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 115,608 | 112,508
Fair value of collateral | 311,043 | 293,724
Carrying value of the assets | 11,097 | 13,870
Fair value of collateral | 6,142 | 10,267
Foreign loans - Latin America [member] | Foreign [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 123,367 | 117,094
Fair value of collateral | 222,300 | 246,462
Carrying value of the assets | 7,348 | 11,242
Fair value of collateral | 2,841 | 3,758
Individuals [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 65,921 | 57,842
Fair value of collateral | 170,045 | 145,775
Carrying value of the assets | 1,997 | 1,054
Fair value of collateral | 1,867 | 993
Individuals [member] | Vehicles [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 17,720 | 15,173
Fair value of collateral | 37,355 | 35,266
Carrying value of the assets | 1,102 | 298
Fair value of collateral | 1,020 | 280
Individuals [member] | Personal loan [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 978 | 643
Fair value of collateral | 2,982 | 1,949
Carrying value of the assets | 857 | 753
Fair value of collateral | 819 | 711
Individuals [member] | Mortgages [member] |  |
Disclosure of collateral held for loan and lease operations portfolio [Line Items] |  |
Carrying value of the assets | 47,223 | 42,026
Fair value of collateral | 129,708 | 108,560
Carrying value of the assets | 38 | 3
Fair value of collateral | R$ 28 | R$ 2

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