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Fair Value of Financial Instruments - Additional Information (Detail) R$ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2018 BRL (R$)
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Standby letters of credit and financial guarantees | R$ |  | R$ 81,733 | R$ 76,852
Short-term assumption period | 5 days |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | $ 0 |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period | 0 |  |
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period | 0 |  |
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period | 0 |  |
Transfers into Level 3 of fair value hierarchy, assets | 0 |  |
Transfers into Level 3 of fair value hierarchy, liabilities | 0 |  |
Transfers out of Level 3 of fair value hierarchy, assets | 0 |  |
Transfers out of Level 3 of fair value hierarchy, liabilities | $ 0 |  |
Fair vale of securities used to evaluate pricing service or brokers | R$ |  | 8,812 |
Level 2 [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Financial instruments classified as Level 2 | R$ |  | 48,110 |
Estimated fair value [member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Standby letters of credit and financial guarantees | R$ |  | R$ 968 | R$ 1,168
Bottom of range [member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Purchase price of securities, percentage | 0.50% |  |
Top of range [member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Purchase price of securities, percentage | 0.50% |  |
Scenarios I [Member] | Interest rate risk [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 1.00% |  |
Scenarios I [Member] | Currency, commodities, and ratios [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 5.00% |  |
Scenarios I [Member] | Bottom of range [member] | Nonlinear [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 5.00% |  |
Scenarios I [Member] | Top of range [member] | Nonlinear [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 25.00% |  |
Scenarios II [Member] | Interest rate risk [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 25.00% |  |
Scenarios II [Member] | Currency, commodities, and ratios [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 10.00% |  |
Scenarios II [Member] | Bottom of range [member] | Nonlinear [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 10.00% |  |
Scenarios II [Member] | Top of range [member] | Nonlinear [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 25.00% |  |
Scenarios III [Member] | Interest rate risk [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Shocks basis point | 50.00% |  |

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