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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, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | R$ 138,636 | R$ 138,308
Subordinated debt [Member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | R$ 75,036 | 74,916
Subordinated debt [Member] | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 4.63% |
Subordinated debt [Member] | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 100.00% |
Foreign loans through securities |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | R$ 62,843 | 62,433
Foreign loans through securities | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 3.17% |
Foreign loans through securities | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 34.16% |
Funding from structured operations certificates (1) |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | R$ 757 | 959
Funding from structured operations certificates (1) | Bottom of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 0.30% |
Funding from structured operations certificates (1) | Top of range [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Interest rate for each operations | 4.80% |
Current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | R$ 27,906 | 19,339
Current [member] | Subordinated debt [Member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | 21,203 | 12,125
Current [member] | Foreign loans through securities |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | 6,560 | 6,636
Current [member] | Funding from structured operations certificates (1) |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | 143 | 578
Non-current [member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | 110,730 | 118,969
Non-current [member] | Subordinated debt [Member] |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | 53,833 | 62,791
Non-current [member] | Foreign loans through securities |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | 56,283 | 55,797
Non-current [member] | Funding from structured operations certificates (1) |  |
Disclosure Of Repurchase Agreements [Line Items] |  |
Institutional market funds | R$ 614 | R$ 381

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