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Hedge Accounting - Summary of Hedge Cash flow (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Variation in value recognized in Other comprehensive income | R$ (1,135,000,000) | R$ (571,000,000) | R$ (697,000,000)
Nominal Value | 126,549,000,000 | 171,439,000,000 |
Hedge of deposits and repurchase agreements [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 29,727,000,000 | 62,667,000,000 |
Hedge of assets transactions [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 8,003,000,000 | 23,919,000,000 |
Hedge of asset backed securities under repurchase agreements [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 38,013,000,000 | 31,855,000,000 |
Hedge of assets denominated in UF [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 13,221,000,000 | 15,227,000,000 |
Hedge of highly probable forecast transactions [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 71,000,000 | 232,000,000 |
Cash flow hedges [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 58,126,000,000 | 71,159,000,000 |
Book value of the hedged item, Liabilities | 32,927,000,000 | 69,111,000,000 |
Variation in value recognized in Other comprehensive income | (1,077,000,000) | (2,162,000,000) |
Cash flow hedge reserve | (2,333,000,000) | (2,162,000,000) |
Nominal Value | 92,408,000,000 | 141,468,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (1,187,000,000) | (2,321,000,000) |
Cash flow hedges [member] | Hedge of loan operations [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 268,000,000 | 1,124,000,000 |
Cash flow hedges [member] | Hedge of funding [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 3,105,000,000 | 6,444,000,000 |
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 | 29,727,000,000 | 62,667,000,000 |
Variation in value recognized in Other comprehensive income | (1,682,000,000) | (3,227,000,000) |
Cash flow hedge reserve | (2,946,000,000) | (3,227,000,000) |
Nominal Value | 29,727,000,000 | 62,667,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (1,800,000,000) | (3,377,000,000) |
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 | 7,866,000,000 | 23,490,000,000 |
Variation in value recognized in Other comprehensive income | 136,000,000 | 429,000,000 |
Cash flow hedge reserve | 136,000,000 | 429,000,000 |
Nominal Value | 8,003,000,000 | 23,919,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 136,000,000 | 429,000,000 |
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 | 36,668,000,000 | 31,099,000,000 |
Variation in value recognized in Other comprehensive income | 353,000,000 | 672,000,000 |
Cash flow hedge reserve | 353,000,000 | 672,000,000 |
Nominal Value | 38,013,000,000 | 31,855,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 359,000,000 | 670,000,000 |
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 | 274,000,000 | 1,124,000,000 |
Variation in value recognized in Other comprehensive income | 6,000,000 | 14,000,000 |
Cash flow hedge reserve | 6,000,000 | 14,000,000 |
Nominal Value | 268,000,000 | 1,124,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 7,000,000 | 13,000,000 |
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 | 13,247,000,000 | 15,227,000,000 |
Variation in value recognized in Other comprehensive income | 26,000,000 | (29,000,000) |
Cash flow hedge reserve | 26,000,000 | (29,000,000) |
Nominal Value | 13,221,000,000 | 15,227,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 23,000,000 | (34,000,000) |
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 | 3,200,000,000 | 6,444,000,000 |
Variation in value recognized in Other comprehensive income | 78,000,000 | (16,000,000) |
Cash flow hedge reserve | 86,000,000 | (16,000,000) |
Nominal Value | 3,105,000,000 | 6,444,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | 82,000,000 | (17,000,000) |
Foreign exchange risk [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book value of the hedged item, Assets | 0 | 0 |
Book value of the hedged item, Liabilities | 14,820,000,000 | 13,074,000,000 |
Variation in value recognized in Other comprehensive income | (7,300,000,000) | (5,507,000,000) |
Nominal Value | 12,550,000,000 | 10,561,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | (7,296,000,000) | (5,503,000,000) |
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 | 71,000,000 | 219,000,000 |
Variation in value recognized in Other comprehensive income | 6,000,000 | (5,000,000) |
Cash flow hedge reserve | 6,000,000 | (5,000,000) |
Nominal Value | 71,000,000 | 232,000,000 |
Variation in the amounts used to calculate hedge ineffectiveness | R$ 6,000,000 | R$ (5,000,000) |

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