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Derivatives - Disclosure of Portfolio of Credit Derivatives (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | R$ 15,447 | R$ 16,355
Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 11,882 | 12,433
Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 196 | 243
Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,369 | 3,679
Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 516 | 752
Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 14,931 | 15,603
Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 9,837 | 8,501
Total return swap [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 5,610 | 7,854
Up to one year [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 7,291 | 9,035
Up to one year [member] | Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 6,144 | 8,255
Up to one year [member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 33 | 66
Up to one year [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,114 | 714
Up to one year [member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 194 | 296
Up to one year [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 7,097 | 8,739
Up to one year [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,681 | 1,181
Up to one year [member] | Total return swap [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 5,610 | 7,854
Later than one year and not later than three years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,566 | 3,928
Later than one year and not later than three years [member] | Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,792 | 1,627
Later than one year and not later than three years [member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 102 | 122
Later than one year and not later than three years [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,672 | 2,179
Later than one year and not later than three years [member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 253 | 372
Later than one year and not later than three years [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,313 | 3,556
Later than one year and not later than three years [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,566 | 3,928
Later than three years and not later than five years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 4,590 | 3,372
Later than three years and not later than five years [member] | Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 3,946 | 2,551
Later than three years and not later than five years [member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 61 | 55
Later than three years and not later than five years [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 583 | 766
Later than three years and not later than five years [member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 69 | 84
Later than three years and not later than five years [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 4,521 | 3,288
Later than three years and not later than five years [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 4,590 | 3,372
Over 5 years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 0 | 20
Over 5 years [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 0 | 20
Over 5 years [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 0 | 20
Over 5 years [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | R$ 0 | R$ 20

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