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Hedge Accounting - Summary of Hedge Instrument of Net Investment in Foreign (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | R$ 126,549,000,000 | R$ 171,439,000,000 |
Variation in value recognized in Other comprehensive income | (1,135,000,000) | (571,000,000) | R$ (697,000,000)
Foreign exchange risk [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 12,550,000,000 | 10,561,000,000 |
Variation in value recognized in Other comprehensive income | (7,300,000,000) | (5,507,000,000) |
Hedges of net investment in foreign operations [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 12,550,000,000 | 10,561,000,000 |
Book Value, Assets | 2,117,000,000 | 1,640,000,000 |
Book value, Liabilities | 113,000,000 | 357,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | (7,296,000,000) | (5,503,000,000) |
Variation in value recognized in Other comprehensive income | (7,300,000,000) | (5,507,000,000) |
Hedge ineffectiveness recognized in income | 4,000,000 | 4,000,000 |
Amount reclassified from foreign currency convertion into income | 0 | 0 |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 12,550,000,000 | 10,561,000,000 |
Variation in value recognized in Other comprehensive income | (7,300,000,000) | (5,507,000,000) |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Forward [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 1,470,000,000 | 1,065,000,000 |
Book Value, Assets | 1,059,000,000 | 1,050,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | 764,000,000 | 661,000,000 |
Variation in value recognized in Other comprehensive income | 726,000,000 | 623,000,000 |
Hedge ineffectiveness recognized in income | 38,000,000 | 38,000,000 |
Amount reclassified from foreign currency convertion into income | 0 | 0 |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | DDI futures [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 27,990,000,000 | 23,641,000,000 |
Book Value, Assets |  | 49,000,000 |
Book value, Liabilities | 113,000,000 |  |
Variations in fair value used to calculate hedge ineffectiveness | (11,394,000,000) | (7,646,000,000) |
Variation in value recognized in Other comprehensive income | (11,353,000,000) | (7,605,000,000) |
Hedge ineffectiveness recognized in income | (41,000,000) | (41,000,000) |
Amount reclassified from foreign currency convertion into income | 0 | 0 |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Non deliverable forward contract [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 13,167,000,000 | 11,474,000,000 |
Book Value, Assets | 255,000,000 |  |
Book value, Liabilities |  | 357,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | 3,198,000,000 | 1,525,000,000 |
Variation in value recognized in Other comprehensive income | 3,189,000,000 | 1,516,000,000 |
Hedge ineffectiveness recognized in income | 9,000,000 | 9,000,000 |
Amount reclassified from foreign currency convertion into income | 0 | 0 |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Financial assets held for hedging[Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 803,000,000 | 541,000,000 |
Book Value, Assets | 803,000,000 | 541,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | 136,000,000 | (43,000,000) |
Variation in value recognized in Other comprehensive income | 138,000,000 | (41,000,000) |
Hedge ineffectiveness recognized in income | (2,000,000) | (2,000,000) |
Amount reclassified from foreign currency convertion into income | R$ 0 | R$ 0 |

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