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Hedge Accounting - Summary of Cash Flow Hedge Instruments (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) |
Cash flow hedges [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 92,408,000,000 | 141,468,000,000 |
Book Value, Assets | 3,293,000,000 | 36,000,000 |
Book value, Liabilities | 13,540,000,000 | (76,000,000) |
Variations in fair value used to calculate hedge ineffectiveness | (1,187,000,000) | (2,321,000,000) |
Variation in value recognized in Other comprehensive income | (1,077,000,000) | (2,162,000,000) |
Hedge ineffectiveness recognized in income | (110,000,000) | (159,000,000) |
Amount reclassified from Cash flow hedge reserve to income | 0 | 0 |
Cash flow hedges [member] | Interest rate risk [Member] | Interest rate futures [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 75,743,000,000 | 118,441,000,000 |
Book Value, Assets | 256,000,000 | 13,000,000 |
Book value, Liabilities | 21,000,000 | (32,000,000) |
Variations in fair value used to calculate hedge ineffectiveness | (1,305,000,000) | (2,278,000,000) |
Variation in value recognized in Other comprehensive income | (1,193,000,000) | (2,126,000,000) |
Hedge ineffectiveness recognized in income | (112,000,000) | (152,000,000) |
Amount reclassified from Cash flow hedge reserve to income | 0 | 0 |
Cash flow hedges [member] | Interest rate risk [Member] | Interest rate swap2 [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 16,594,000,000 | 22,795,000,000 |
Book Value, Assets | 3,023,000,000 | 14,000,000 |
Book value, Liabilities | 13,519,000,000 | (44,000,000) |
Variations in fair value used to calculate hedge ineffectiveness | 112,000,000 | (38,000,000) |
Variation in value recognized in Other comprehensive income | 110,000,000 | (31,000,000) |
Hedge ineffectiveness recognized in income | 2,000,000 | (7,000,000) |
Amount reclassified from Cash flow hedge reserve to income | 0 | 0 |
Cash flow hedges [member] | Foreign exchange risk [member] | DDI futures [Member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 6,000,000 | 78,000,000 |
Book Value, Assets | 5,000,000 |  |
Variations in fair value used to calculate hedge ineffectiveness | 1,000,000 | 1,000,000 |
Variation in value recognized in Other comprehensive income | 1,000,000 | 1,000,000 |
Amount reclassified from Cash flow hedge reserve to income | 0 | 0 |
Cash flow hedges [member] | Foreign exchange risk [member] | Option contract [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Nominal Value | 65,000,000 | 154,000,000 |
Book Value, Assets | 9,000,000 | 9,000,000 |
Variations in fair value used to calculate hedge ineffectiveness | 5,000,000 | (6,000,000) |
Variation in value recognized in Other comprehensive income | 5,000,000 | (6,000,000) |
Amount reclassified from Cash flow hedge reserve to income | R$ 0 | R$ 0 |

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- Definition The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_92&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_d&doctype=Standard&book=B -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_iv&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24E_a&doctype=Standard -URIDate 2017-03-09 + Details
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