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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