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Hedge Accounting - Summary of Fair Value Hedge Instruments (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Detailed Information about Hedges [Line Items] |  |
Nominal Value | R$ 116,430,000,000 | R$ 126,549,000,000
Fair value hedge [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Nominal Value | 19,431,000,000 | 21,591,000,000
Fair value hedge [Member] | Interest rate risk [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Nominal Value | 19,431,000,000 | 21,591,000,000
Book Value, Assets | 766,000,000 | 86,000,000
Book value, Liabilities | 4,636,000,000 | 1,078,000,000
Variation in the amount used to calculate hedge ineffectiveness | 426,000,000 | (93,000,000)
Hedge ineffectiveness recognized in income | 15,000,000 | 10,000,000
Fair value hedge [Member] | Interest rate risk [Member] | Interest rate swap2 [Member] |  |
Disclosure of Detailed Information about Hedges [Line Items] |  |
Nominal Value | 19,431,000,000 | 21,591,000,000
Book Value, Assets | 766,000,000 | 86,000,000
Book value, Liabilities | 4,636,000,000 | 1,078,000,000
Variation in the amount used to calculate hedge ineffectiveness | 426,000,000 | (93,000,000)
Hedge ineffectiveness recognized in income | R$ 15,000,000 | R$ 10,000,000

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- Definition The gain (loss) on the change in fair value of the hedging instrument 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 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2019-03-27 + Details
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