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Hedge Accounting - Summary of Hedge Instrument of Net Investment in Foreign (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | R$ 148,461,000,000 | R$ 215,277,000,000 |
Book Value, Assets | 7,060,000,000 | 5,001,000,000 |
Book value, Liabilities | 3,653,000,000 | 2,793,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | (14,688,000,000) | (14,601,000,000) |
Variation in value recognized in Other comprehensive income | 699,000,000 | (3,557,000,000) | R$ (16,000,000)
Hedge ineffectiveness recognized in income | 13,000,000 | (3,000,000) |
Futures [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 2,126,000,000 | 5,052,000,000 |
Book Value, Assets | 286,000,000 |  |
Book value, Liabilities |  | 31,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | (3,252,000,000) | (3,844,000,000) |
Variation in value recognized in Other comprehensive income | (3,241,000,000) | (3,836,000,000) |
Hedge ineffectiveness recognized in income | (11,000,000) | (8,000,000) |
NDF - Non Deliverable Forward [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 6,000,000,000 | 15,196,000,000 |
Book Value, Assets | 208,000,000 | 445,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | (3,502,000,000) | (8,006,000,000) |
Variation in value recognized in Other comprehensive income | (3,529,000,000) | (7,993,000,000) |
Hedge ineffectiveness recognized in income | 27,000,000 | (13,000,000) |
Financial assets held for hedging[Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 5,762,000,000 | 4,371,000,000 |
Book Value, Assets | 6,566,000,000 | 4,556,000,000 |
Book value, Liabilities | 3,653,000,000 | 2,762,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | (7,934,000,000) | (2,751,000,000) |
Variation in value recognized in Other comprehensive income | (7,931,000,000) | (2,769,000,000) |
Hedge ineffectiveness recognized in income | (3,000,000) | 18,000,000 |
Hedges of net investment in foreign operations [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 13,888,000,000 | 24,619,000,000 |
Variation in value recognized in Other comprehensive income | R$ (14,701,000,000) | R$ (14,598,000,000) |

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