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Contingent Assets and Liabilities, Provisions and Legal Obligations - 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, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | R$ 14,520 | R$ 13,534
Quotas | 1,148 | 2,169
Surety | 3,223 | 1,880
Insurance bond | 14,867 | 12,103
Guarantee by government securities | 96 | 539
Total | 33,854 | R$ 30,225
Civil [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | 1,532 |
Quotas | 647 |
Surety | 60 |
Insurance bond | 1,678 |
Guarantee by government securities | 17 |
Total | 3,934 |
Labour [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | 2,378 |
Quotas | 418 |
Surety | 63 |
Insurance bond | 914 |
Guarantee by government securities | 0 |
Total | 3,773 |
Tax [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Deposits in guarantee (Note 18a) | 10,610 |
Quotas | 83 |
Surety | 3,100 |
Insurance bond | 12,275 |
Guarantee by government securities | 79 |
Total | R$ 26,147 |

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