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Hedge Accounting - Summary of Hedge Cash flow (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Variation in value recognized in Other comprehensive income | R$ 699,000,000 | R$ (3,557,000,000) | R$ (16,000,000)
Nominal Amount | 148,461,000,000 | 215,277,000,000 |
Hedge of deposits and repurchase agreements [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Amount | 39,136,000,000 | 103,407,000,000 |
Hedge of assets transactions [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Amount | 8,213,000,000 | 5,743,000,000 |
Hedge of asset-backed securities under repurchase agreements [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Amount | 39,962,000,000 | 31,417,000,000 |
Hedge of assets denominated in UF [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Amount | 14,683,000,000 | 16,677,000,000 |
Hedge of highly probable forecast transactions [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Amount | 3,508,000,000 | 1,314,000,000 |
Cash flow hedges [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 67,344,000,000 | 53,521,000,000 |
Book value of the hedged item, Liabilities | 44,891,000,000 | 105,414,000,000 |
Variation in value recognized in Other comprehensive income | (942,000,000) | (1,767,000,000) |
Cash flow hedge reserve | (387,000,000) | (1,549,000,000) |
Nominal Amount | 111,412,000,000 | 160,870,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (946,000,000) | (1,766,000,000) |
Cash flow hedges [member] | Hedge of loan operations [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Amount | 131,000,000 | 316,000,000 |
Cash flow hedges [member] | Hedge of funding [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Amount | 5,779,000,000 | 1,996,000,000 |
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of deposits and repurchase agreements [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Liabilities | 39,142,000,000 | 103,407,000,000 |
Variation in value recognized in Other comprehensive income | 1,065,000,000 | (2,423,000,000) |
Cash flow hedge reserve | 1,065,000,000 | (2,458,000,000) |
Nominal Amount | 39,136,000,000 | 103,407,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 1,072,000,000 | (2,429,000,000) |
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of assets transactions [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 8,621,000,000 | 5,673,000,000 |
Variation in value recognized in Other comprehensive income | (409,000,000) | 66,000,000 |
Cash flow hedge reserve | (409,000,000) | 66,000,000 |
Nominal Amount | 8,213,000,000 | 5,743,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (409,000,000) | 66,000,000 |
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of asset-backed securities under repurchase agreements [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 40,526,000,000 | 29,533,000,000 |
Variation in value recognized in Other comprehensive income | (1,686,000,000) | 697,000,000 |
Cash flow hedge reserve | (1,686,000,000) | 697,000,000 |
Nominal Amount | 39,962,000,000 | 31,417,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (1,698,000,000) | 699,000,000 |
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of loan operations [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 131,000,000 | 327,000,000 |
Variation in value recognized in Other comprehensive income | 0 | 12,000,000 |
Cash flow hedge reserve | 0 | 12,000,000 |
Nominal Amount | 131,000,000 | 316,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 1,000,000 | 15,000,000 |
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of assets denominated in UF [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 14,558,000,000 | 16,674,000,000 |
Variation in value recognized in Other comprehensive income | (127,000,000) | (4,000,000) |
Cash flow hedge reserve | (127,000,000) | (4,000,000) |
Nominal Amount | 14,683,000,000 | 16,677,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (127,000,000) | (1,000,000) |
Interest rate risk [Member] | Cash flow hedges [member] | Hedge of funding [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Liabilities | 5,749,000,000 | 2,007,000,000 |
Variation in value recognized in Other comprehensive income | 30,000,000 | (10,000,000) |
Cash flow hedge reserve | 30,000,000 | (10,000,000) |
Nominal Amount | 5,779,000,000 | 1,996,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 30,000,000 | (11,000,000) |
Foreign exchange risk [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 9,646,000,000 | 15,277,000,000 |
Book value of the hedged item, Liabilities | 0 | 0 |
Variation in value recognized in Other comprehensive income | (14,701,000,000) | (14,598,000,000) |
Nominal Amount | 13,888,000,000 | 24,619,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (14,688,000,000) | (14,601,000,000) |
Foreign exchange risk [member] | Cash flow hedges [member] | Hedge of highly probable forecast transactions [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 3,508,000,000 | 1,314,000,000 |
Variation in value recognized in Other comprehensive income | 185,000,000 | (105,000,000) |
Cash flow hedge reserve | 740,000,000 | 148,000,000 |
Nominal Amount | 3,508,000,000 | 1,314,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | R$ 185,000,000 | R$ (105,000,000) |

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