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Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Funds - Summary of Breakdown of Funds Obtained in Institutional Markets (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | R$ 104,244 | R$ 93,974
Subordinated debt [Member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | R$ 59,462 | 49,313
Interest rate for each operations | 4.63% |
Obligations on securities abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | R$ 43,672 | 41,863
Obligations on securities abroad [member] | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 2.05% |
Obligations on securities abroad [member] | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 30.13% |
Raisings through structured operations certificates [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | R$ 1,110 | 2,798
Raisings through structured operations certificates [member] | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 2.62% |
Raisings through structured operations certificates [member] | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 11.12% |
Current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | R$ 13,835 | 8,524
Current [member] | Subordinated debt [Member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | 4,098 | 343
Current [member] | Obligations on securities abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | 9,162 | 6,232
Current [member] | Raisings through structured operations certificates [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | 575 | 1,949
Non-current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | 90,409 | 85,450
Non-current [member] | Subordinated debt [Member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | 55,364 | 48,970
Non-current [member] | Obligations on securities abroad [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | 34,510 | 35,631
Non-current [member] | Raisings through structured operations certificates [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institucional market funds | R$ 535 | R$ 849

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