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Hedge Accounting - Summary of Hedge of Net Investment in Foreign Operations (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 |
Hedges of net investment in foreign operations [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
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 |
Foreign exchange risk [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book Value, Assets | 0 | 0 |
Book Value, 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) |
Foreign currency convertion | (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] | Hedges of net investment in foreign operations [member] |  |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |  |
Book Value, Assets | 0 | 0 |
Book Value, 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) |
Foreign currency convertion | (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 | R$ (7,296,000,000) | R$ (5,503,000,000) |

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_iv&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_b_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) recognised in other comprehensive income on change in value of foreign currency basis spreads, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of a hedged item, recognised as a liability. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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