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Risk and Capital Management - Credit Risk Exposure (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of credit risk exposure [line items]    
Financial Assets R$ 1,410,233 R$ 1,330,728
At Amortized Cost 1,010,644 994,759
Interbank deposits 34,583 26,420
Securities purchased under agreements to resell 198,428 280,136
Securities 133,119 110,395
Loan operations and lease operations 585,791 536,091
Other financial assets 94,752 75,090
(-) Provision for Expected Loss (36,029) (33,373)
At Fair Value Through Other Comprehensive Income 76,660 49,323
Securities 76,660 49,323
At Fair Value Through Profit or Loss 322,929 286,646
Securities 281,075 263,180
Derivatives 41,854 23,466
Financial liabilities - provision for expected loss 4,140 3,792
Loan Commitments 3,303 2,601
Financial Guarantees 837 1,191
Off balance sheet 387,155 349,695
Credit risk exposure 1,793,248 1,676,631
Financial Guarantees Provided [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 66,720 66,105
Letters Of Credit To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 15,013 10,747
Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 305,422 272,843
Mortgage loans [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 5,536 3,403
Overdraft Accounts [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 124,449 110,454
Credit Cards [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 140,837 123,823
Other Pre Approved Limits [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 34,600 35,163
Brazil [Member]    
Disclosure of credit risk exposure [line items]    
Financial Assets 1,073,430 1,027,193
At Amortized Cost 755,773 756,993
Interbank deposits 10,620 6,239
Securities purchased under agreements to resell 197,157 279,353
Securities 114,046 90,234
Loan operations and lease operations 386,206 345,501
Other financial assets 75,968 61,875
(-) Provision for Expected Loss (28,224) (26,209)
At Fair Value Through Other Comprehensive Income 35,990 9,089
Securities 35,990 9,089
At Fair Value Through Profit or Loss 281,667 261,111
Securities 271,470 252,819
Derivatives 10,197 8,292
Financial liabilities - provision for expected loss 3,581 3,355
Loan Commitments 2,909 2,289
Financial Guarantees 672 1,066
Off balance sheet 338,262 300,522
Credit risk exposure 1,408,111 1,324,360
Brazil [Member] | Financial Guarantees Provided [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 52,663 53,443
Brazil [Member] | Letters Of Credit To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 15,013 10,747
Brazil [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 270,586 236,332
Brazil [Member] | Mortgage loans [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 5,536 3,403
Brazil [Member] | Overdraft Accounts [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 124,449 110,454
Brazil [Member] | Credit Cards [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 138,014 120,862
Brazil [Member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 2,587 1,613
Foreign [member]    
Disclosure of credit risk exposure [line items]    
Financial Assets 336,803 303,535
At Amortized Cost 254,871 237,766
Interbank deposits 23,963 20,181
Securities purchased under agreements to resell 1,271 783
Securities 19,073 20,161
Loan operations and lease operations 199,585 190,590
Other financial assets 18,784 13,215
(-) Provision for Expected Loss (7,805) (7,164)
At Fair Value Through Other Comprehensive Income 40,670 40,234
Securities 40,670 40,234
At Fair Value Through Profit or Loss 41,262 25,535
Securities 9,605 10,361
Derivatives 31,657 15,174
Financial liabilities - provision for expected loss 559 437
Loan Commitments 394 312
Financial Guarantees 165 125
Off balance sheet 48,893 49,173
Credit risk exposure 385,137 352,271
Foreign [member] | Financial Guarantees Provided [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 14,057 12,662
Foreign [member] | Letters Of Credit To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 0  
Foreign [member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 34,836 36,511
Foreign [member] | Mortgage loans [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 0  
Foreign [member] | Overdraft Accounts [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 0  
Foreign [member] | Credit Cards [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet 2,823 2,961
Foreign [member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member]    
Disclosure of credit risk exposure [line items]    
Off balance sheet R$ 32,013 R$ 33,550