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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Gross Carrying Amount and Fair Value of Financial Assets Through Other Comprehensive Income-Securities by Maturity (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | R$ 27,398 | R$ 33,094
Current Fair value | 26,428 | 32,872
Non-current gross carrying amount | 81,157 | 74,341
Non-current fair value | 79,194 | 77,070
Gross carrying amount | 108,555 | 107,435
Fair value | 105,622 | 109,942
Non-stated maturity [Member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 1,629 | 1,640
Current Fair value | 743 | 1,382
Up to one year [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 25,769 | 31,454
Current Fair value | 25,685 | 31,490
From one to five years [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Non-current gross carrying amount | 64,034 | 52,825
Non-current fair value | 63,256 | 54,452
From five to ten years [Member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Non-current gross carrying amount | 12,017 | 14,084
Non-current fair value | 11,557 | 14,852
After ten years [Member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Non-current gross carrying amount | 5,106 | 7,432
Non-current fair value | R$ 4,381 | R$ 7,766

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- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_h&doctype=Standard -URIDate 2021-03-24 + Details
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