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Hedge Accounting - Summary of Hedge Instrument of Net Investment in Foreign (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | R$ 116,430,000,000 | R$ 126,549,000,000 |
Variation in value recognized in Other comprehensive income | (16,000,000) | (1,135,000,000) | R$ (571,000,000)
Foreign exchange risk [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 16,947,000,000 | 12,550,000,000 |
Variation in value recognized in Other comprehensive income | (7,217,000,000) | (7,300,000,000) |
Hedges of net investment in foreign operations [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 16,947,000,000 | 12,550,000,000 |
Book Value, Assets | 4,988,000,000 | 2,117,000,000 |
Book value, Liabilities | 0 | 113,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | (7,220,000,000) | (7,296,000,000) |
Variation in value recognized in Other comprehensive income | (7,217,000,000) | (7,300,000,000) |
Hedge ineffectiveness recognized in income | (3,000,000) | 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 | 16,947,000,000 | 12,550,000,000 |
Variation in value recognized in Other comprehensive income | (7,217,000,000) | (7,300,000,000) |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Forward [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | (2,990,000,000) | (1,470,000,000) |
Book Value, Assets | 2,977,000,000 | 1,059,000,000 |
Book value, Liabilities | 0 |  |
Variations in fair value used to calculate hedge ineffectiveness | 408,000,000 | 764,000,000 |
Variation in value recognized in Other comprehensive income | 381,000,000 | 726,000,000 |
Hedge ineffectiveness recognized in income | 27,000,000 | 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 | 32,966,000,000 | 27,990,000,000 |
Book Value, Assets | 228,000,000 |  |
Book value, Liabilities | 0 | 113,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | (12,329,000,000) | (11,394,000,000) |
Variation in value recognized in Other comprehensive income | (12,292,000,000) | (11,353,000,000) |
Hedge ineffectiveness recognized in income | (37,000,000) | (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 | (11,525,000,000) | (13,167,000,000) |
Book Value, Assets | 260,000,000 | 255,000,000 |
Book value, Liabilities | 0 |  |
Variations in fair value used to calculate hedge ineffectiveness | 4,443,000,000 | 3,198,000,000 |
Variation in value recognized in Other comprehensive income | 4,434,000,000 | 3,189,000,000 |
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 | (1,504,000,000) | (803,000,000) |
Book Value, Assets | 1,523,000,000 | 803,000,000 |
Book value, Liabilities | 0 |  |
Variations in fair value used to calculate hedge ineffectiveness | 258,000,000 | 136,000,000 |
Variation in value recognized in Other comprehensive income | 260,000,000 | 138,000,000 |
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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