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Financial Assets at Fair Value Through Other Comprehensive Income-Securities - Summary of Reconciliation of Expected Loss for Financial Assets at Fair Value Through Other Comprehensive Instrument-Securities, Segregated by Stages (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financial assets at fair value through other comprehensive income [line items] |  |  |
Gains / (Losses) | R$ 2,086 | R$ (1,107) | R$ (628)
Level 1 [Member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (93) | (86) |
Gains / (Losses) | 3 | (8) |
Purchases | (2) | (17) |
Settlements | 8 | 18 |
Expected loss, ending balance | (84) | (93) | (86)
Level 1 [Member] | Brazilian government securities [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (36) | (36) |
Expected loss, ending balance | (36) | (36) | (36)
Level 1 [Member] | Corporate debt securities [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (56) | (47) |
Gains / (Losses) | 2 | (10) |
Purchases | (2) | (16) |
Settlements | 8 | 17 |
Expected loss, ending balance | (48) | (56) | (47)
Level 1 [Member] | Government securities - abroad [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (1) | (3) |
Gains / (Losses) | 1 | 2 |
Purchases | 0 | (1) |
Settlements | 0 | 1 |
Expected loss, ending balance | 0 | (1) | (3)
Level 1 [Member] | Other [member] | Brazilian government securities [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (36) | (36) |
Expected loss, ending balance | (36) | (36) | (36)
Level 1 [Member] | Other [member] | Corporate debt securities [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (3) | (3) |
Expected loss, ending balance | (3) | (3) | (3)
Level 1 [Member] | Debentures [member] | Corporate debt securities [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (44) | (43) |
Purchases | 0 | (1) |
Expected loss, ending balance | (44) | (44) | (43)
Level 1 [Member] | Eurobonds and others [member] | Corporate debt securities [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Expected loss, beginning balance | (9) | (1) |
Gains / (Losses) | 2 | (10) |
Purchases | (2) | (15) |
Settlements | 8 | 17 |
Expected loss, ending balance | R$ (1) | R$ (9) | R$ (1)

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- Definition The gains (losses) recognised in other comprehensive income on financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9, net of tax, before reclassification adjustments. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_91_a&doctype=Standard -URIDate 2021-03-24 + Details
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