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Financial Assets at Amortized Cost-Securities - Summary of Financial Assets at Amortized Cost - Securities (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Financial Assets [Line Items]    
Amortized cost R$ 1,010,644 R$ 994,759
Financial assets securities [Member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 133,119 110,395
Expected loss (2,653) (3,646)
Net amortized cost 130,466 106,749
Financial assets securities [Member] | Brazilian government securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 56,355 54,064
Expected loss (52) (58)
Net amortized cost 56,303 54,006
Financial assets securities [Member] | Government securities - abroad [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 17,226 6,700
Expected loss 0 (3)
Net amortized cost 17,226 6,697
Financial assets securities [Member] | Government securities - abroad [member] | Colombia [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 335 356
Expected loss 0 (3)
Net amortized cost 335 353
Financial assets securities [Member] | Government securities - abroad [member] | Chile [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 621 256
Net amortized cost 621 256
Financial assets securities [Member] | Government securities - abroad [member] | Korea [Member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 3,427 1,385
Net amortized cost 3,427 1,385
Financial assets securities [Member] | Government securities - abroad [member] | Spain [Member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 4,984 2,411
Net amortized cost 4,984 2,411
Financial assets securities [Member] | Government securities - abroad [member] | United States [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 80 19
Net amortized cost 80 19
Financial assets securities [Member] | Government securities - abroad [member] | Mexico [Member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 7,763 2,258
Net amortized cost 7,763 2,258
Financial assets securities [Member] | Government securities - abroad [member] | Uruguay [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 16 15
Net amortized cost 16 15
Financial assets securities [Member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 59,538 49,631
Expected loss (2,601) (3,585)
Net amortized cost 56,937 46,046
Financial assets securities [Member] | Rural product note [Member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 5,388 4,181
Expected loss (47) (178)
Net amortized cost 5,341 4,003
Financial assets securities [Member] | Bank deposit certificates [member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 54 123
Net amortized cost 54 123
Financial assets securities [Member] | Real estate receivables certificates [member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 5,844 9,876
Expected loss (2) (361)
Net amortized cost 5,842 9,515
Financial assets securities [Member] | Debentures [member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 41,053 29,001
Expected loss (2,532) (3,013)
Net amortized cost 38,521 25,988
Financial assets securities [Member] | Eurobonds and others [member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 1,083 4,005
Expected loss (1) (2)
Net amortized cost 1,082 4,003
Financial assets securities [Member] | Promissory notes [Member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 5,001 1,069
Expected loss (3) (14)
Net amortized cost 4,998 1,055
Financial assets securities [Member] | Other [member] | Corporate debt securities [member]    
Disclosure of Financial Assets [Line Items]    
Amortized cost 1,115 1,376
Expected loss (16) (17)
Net amortized cost R$ 1,099 R$ 1,359