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Risk and Capital Management - Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios (Parenthetical) (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios Parenthetical Detail [Line Items] |  |
Expected credit loss percentage | 100.00% | 100.00%
Financial guarantee contracts [member] |  |
Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios Parenthetical Detail [Line Items] |  |
Expected credit loss | R$ 767 | R$ 907
Loan commitments [member] |  |
Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios Parenthetical Detail [Line Items] |  |
Expected credit loss | R$ 4,433 | R$ 3,485
BRAZIL | Optimistic [Member] |  |
Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios Parenthetical Detail [Line Items] |  |
Expected credit loss percentage | 5.00% |
BRAZIL | Base Case Scenario [Member] |  |
Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios Parenthetical Detail [Line Items] |  |
Expected credit loss percentage | 45.00% |
BRAZIL | Pessimistic Scenario [Member] |  |
Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios Parenthetical Detail [Line Items] |  |
Expected credit loss percentage | 50.00% |

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- Definition The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph IG20D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Disclosure Of Financial Assets At Amortised Cost And At Fair Value Through Other Comprehensive Income And The Impact On Expected Credit Loss In Various Scenarios . + References No definition available. + Details
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- Definition Expected Credit Loss . + References No definition available. + Details
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