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Derivatives - Disclosure of Portfolio of Credit Derivatives (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments R$ 6,853 R$ 6,416
Brazilian Government [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 3,772 3,597
Government Abroad [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 314 329
Private Entities [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 2,767 2,490
Investment grade [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 1,361 1,416
Below Investment grade [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 5,492 5,000
Credit default swaps [member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 6,853 6,416
Up to one year [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 1,685 1,200
Up to one year [Member] | Brazilian Government [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 1,167 406
Up to one year [Member] | Government Abroad [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 71 144
Up to one year [Member] | Private Entities [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 447 650
Up to one year [Member] | Investment grade [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 300 449
Up to one year [Member] | Below Investment grade [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 1,385 751
Up to one year [Member] | Credit default swaps [member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 1,685 1,200
Later than one year and not later than three years [member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 1,913 2,412
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 1,118 1,671
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 85 90
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 710 651
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 510 347
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 1,403 2,065
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 1,913 2,412
Later than three years and not later than five years [member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 3,203 2,804
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 1,487 1,520
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 156 95
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 1,560 1,189
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 539 620
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 2,664 2,184
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 3,203 R$ 2,804
Over 5 years [Member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments 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 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 40  
Over 5 years [Member] | Credit default swaps [member]    
Disclosure of credit risk exposure [line items]    
Maximum potential amount of future payments R$ 52