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Derivatives - Disclosure of Portfolio of Credit Derivatives (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | R$ 10,444 | R$ 6,853
Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 7,301 | 3,772
Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 200 | 314
Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 2,943 | 2,767
Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,049 | 1,361
Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 9,395 | 5,492
Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 6,283 | 6,853
Total return swap [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 4,161 |
Up to one year [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 5,174 | 1,685
Up to one year [member] | Brazilian Government [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 4,921 | 1,167
Up to one year [member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 34 | 71
Up to one year [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 219 | 447
Up to one year [member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 135 | 300
Up to one year [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 5,039 | 1,385
Up to one year [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 1,013 | 1,685
Up to one year [member] | Total return swap [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 4,161 |
Later than one year and not later than three years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 2,675 | 1,913
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 | 1,117 | 1,118
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 | 88 | 85
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 | 1,470 | 710
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 | 602 | 510
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 | 2,073 | 1,403
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 | 2,675 | 1,913
Later than three years and not later than five years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 2,539 | 3,203
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 | 1,263 | 1,487
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 | 78 | 156
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 | 1,198 | 1,560
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 | 312 | 539
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 | 2,227 | 2,664
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 | 2,539 | 3,203
Over 5 years [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 56 | 52
Over 5 years [member] | Government Abroad [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments |  | 2
Over 5 years [member] | Private Entities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 56 | 50
Over 5 years [member] | Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments |  | 12
Over 5 years [member] | Below Investment grade [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | 56 | 40
Over 5 years [member] | Credit default swaps [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum potential amount of future payments | R$ 56 | R$ 52

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