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Provisions, Contingent Assets and Contingent Liabilities - Summary of Assets Pledged as Collateral for Lawsuits Involving Contingent Liabilities are Restricted or Deposited (Detail) - Guarantees Of Contingencies Provisions And Legal Obligations [Member] - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | R$ 12,264 | R$ 12,693
Investments fund quotas | 690 | 987
Surety | 4,115 | 4,012
Insurance bond | 18,771 | 18,402
Guarantee by government securities | 242 | 249
Total | 36,082 | R$ 36,343
Civil [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | 1,427 |
Investments fund quotas | 408 |
Surety | 70 |
Insurance bond | 1,710 |
Guarantee by government securities | 7 |
Total | 3,622 |
Labour [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | 1,990 |
Investments fund quotas | 204 |
Surety | 48 |
Insurance bond | 1,325 |
Guarantee by government securities | 0 |
Total | 3,567 |
Tax [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | 8,847 |
Investments fund quotas | 78 |
Surety | 3,997 |
Insurance bond | 15,736 |
Guarantee by government securities | 235 |
Total | R$ 28,893 |

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