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Hedge Accounting - Schedule of the Effect of Hedge Accounting on the Financial Position and Performance (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Detailed Information about Hedges [Line Items] |  |
Nominal Value | R$ 126,549,000,000 | R$ 171,439,000,000
Fair value hedge [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Book value of the hedged item, Assets | 12,457,000,000 | 6,459,000,000
Book Value of the hedged item, Liabilities | 9,124,000,000 | 12,951,000,000
Fair value of the hedge item, Assets | 12,602,000,000 | 6,428,000,000
Fair value of the hedge item, Liabilities | 9,081,000,000 | 10,341,000,000
Variation in the amounts used to calculate hedge ineffectiveness | 103,000,000 | 25,000,000
Nominal Value | 21,591,000,000 | 19,410,000,000
Variation in value recognized in income | (93,000,000) | (27,000,000)
Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Book value of the hedged item, Assets | 7,066,000,000 | 5,977,000,000
Fair value of the hedge item, Assets | 7,119,000,000 | 5,978,000,000
Variation in the amounts used to calculate hedge ineffectiveness | 53,000,000 | (50,000,000)
Nominal Value | 7,066,000,000 | 5,977,000,000
Variation in value recognized in income | (54,000,000) | 52,000,000
Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Book value of the hedged item, Assets | 0 |
Book Value of the hedged item, Liabilities | 9,124,000,000 | 12,157,000,000
Fair value of the hedge item, Liabilities | 9,081,000,000 | 9,562,000,000
Variation in the amounts used to calculate hedge ineffectiveness | (43,000,000) | 108,000,000
Nominal Value | 9,124,000,000 | 12,157,000,000
Variation in value recognized in income | 43,000,000 | (113,000,000)
Fair value hedge [Member] | Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Book value of the hedged item, Assets | 5,391,000,000 | 482,000,000
Fair value of the hedge item, Assets | 5,483,000,000 | 450,000,000
Variation in the amounts used to calculate hedge ineffectiveness | 93,000,000 | (33,000,000)
Nominal Value | 5,401,000,000 | 482,000,000
Variation in value recognized in income | R$ (82,000,000) | 34,000,000
Fair value hedge [Member] | Hedge of syndicated loan [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Book Value of the hedged item, Liabilities |  | 794,000,000
Fair value of the hedge item, Liabilities |  | 779,000,000
Nominal Value |  | R$ 794,000,000

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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position 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 ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position 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 ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_ii&doctype=Standard -URIDate 2017-03-09 + Details
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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 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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