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Hedge Accounting - Schedule of Each Strategy of Nominal Value and Fair Value Adjustments of Hedge Instruments and Book Value of Hedged Item (Detail) - BRL (R$) | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | R$ 116,430,000,000 | R$ 126,549,000,000
Hedge instruments, fair value adjustments | 5,469,000,000 | 2,378,000,000
Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 24,543,000,000 | 29,727,000,000
Hedge instruments, fair value adjustments | (37,000,000) | (21,000,000)
Hedge instruments, Book Value | 24,543,000,000 | 29,727,000,000
Hedge of highly probable forecast transactions [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 294,000,000 | 71,000,000
Hedge instruments, fair value adjustments | (11,000,000) | 6,000,000
Hedge instruments, Book Value | 294,000,000 | 71,000,000
Hedge of assets transactions [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 5,656,000,000 | 8,003,000,000
Hedge instruments, fair value adjustments | 91,000,000 | 136,000,000
Hedge instruments, Book Value | 5,564,000,000 | 7,866,000,000
Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 32,130,000,000 | 38,013,000,000
Hedge instruments, fair value adjustments | 20,000,000 | 8,000,000
Hedge instruments, Book Value | 30,896,000,000 | 36,668,000,000
Hedge of assets denominated in UF [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 12,582,000,000 | 13,221,000,000
Hedge instruments, fair value adjustments | 5,000,000 | 23,000,000
Hedge instruments, Book Value | 12,588,000,000 | 13,247,000,000
Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 4,609,000,000 | 5,401,000,000
Hedge instruments, fair value adjustments | (85,000,000) | (82,000,000)
Hedge instruments, Book Value | 4,482,000,000 | 5,391,000,000
Hedges of net investment in foreign operations [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 16,947,000,000 | 12,550,000,000
Hedge instruments, fair value adjustments | 4,988,000,000 | 2,230,000,000
Hedge instruments, Book Value | 14,396,000,000 | 14,820,000,000
Fair value hedge [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 19,431,000,000 | 21,591,000,000
Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 7,436,000,000 | 9,124,000,000
Hedge instruments, fair value adjustments | 775,000,000 | 43,000,000
Hedge instruments, Book Value | 7,436,000,000 | 9,124,000,000
Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 7,386,000,000 | 7,066,000,000
Hedge instruments, fair value adjustments | (264,000,000) | (54,000,000)
Hedge instruments, Book Value | 7,386,000,000 | 7,066,000,000
Cash flow hedges [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 80,052,000,000 | 92,408,000,000
Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 4,590,000,000 | 3,105,000,000
Hedge instruments, fair value adjustments | (27,000,000) | 82,000,000
Hedge instruments, Book Value | 4,617,000,000 | 3,200,000,000
Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 257,000,000 | 268,000,000
Hedge instruments, fair value adjustments | 14,000,000 | 7,000,000
Hedge instruments, Book Value | R$ 269,000,000 | R$ 274,000,000

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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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