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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$) | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | R$ 148,461,000,000 | R$ 215,277,000,000
Hedge instruments, fair value adjustments | 3,013,000,000 | 3,060,000,000
Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 39,136,000,000 | 103,407,000,000
Hedge instruments, fair value adjustments | 86,000,000 | 158,000,000
Hedge instruments, Book Value | 39,142,000,000 | 103,407,000,000
Hedge of highly probable forecast transactions [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 3,508,000,000 | 1,314,000,000
Hedge instruments, fair value adjustments | 185,000,000 | (105,000,000)
Hedge instruments, Book Value | 3,508,000,000 | 1,314,000,000
Hedge of assets transactions [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 8,213,000,000 | 5,743,000,000
Hedge instruments, fair value adjustments | (409,000,000) | 66,000,000
Hedge instruments, Book Value | 8,621,000,000 | 5,673,000,000
Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 39,962,000,000 | 31,417,000,000
Hedge instruments, fair value adjustments | 50,000,000 | (11,000,000)
Hedge instruments, Book Value | 40,526,000,000 | 29,533,000,000
Hedge of assets denominated in UF [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 14,683,000,000 | 16,677,000,000
Hedge instruments, fair value adjustments | (127,000,000) | (1,000,000)
Hedge instruments, Book Value | 14,558,000,000 | 16,674,000,000
Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 3,220,000,000 | 10,383,000,000
Hedge instruments, fair value adjustments | 206,000,000 | (226,000,000)
Hedge instruments, Book Value | 3,187,000,000 | 10,192,000,000
Hedges of net investment in foreign operations [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 13,888,000,000 | 24,619,000,000
Hedge instruments, fair value adjustments | 3,407,000,000 | 2,208,000,000
Hedge instruments, Book Value | 9,646,000,000 | 15,277,000,000
Fair value hedge [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 23,161,000,000 | 29,788,000,000
Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 11,051,000,000 | 10,200,000,000
Hedge instruments, fair value adjustments | (388,000,000) | 1,390,000,000
Hedge instruments, Book Value | 11,051,000,000 | 10,200,000,000
Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 8,890,000,000 | 9,205,000,000
Hedge instruments, fair value adjustments | (28,000,000) | (423,000,000)
Hedge instruments, Book Value | 8,890,000,000 | 9,205,000,000
Cash flow hedges [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 111,412,000,000 | 160,870,000,000
Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 5,779,000,000 | 1,996,000,000
Hedge instruments, fair value adjustments | 30,000,000 | (11,000,000)
Hedge instruments, Book Value | 5,749,000,000 | 2,007,000,000
Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 131,000,000 | 316,000,000
Hedge instruments, fair value adjustments | 1,000,000 | 15,000,000
Hedge instruments, Book Value | R$ 131,000,000 | R$ 327,000,000

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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 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -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 2021-03-24 + Details
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