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Risk and Capital Management - Credit Risk Exposure (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of credit risk exposure [line items]      
Financial Assets R$ 1,330,728 R$ 1,231,414  
At Amortized Cost 994,759 905,729 R$ 902,289
Interbank deposits 26,420 29,048 22,688
Securities purchased under agreements to resell 280,136 244,707 265,050
Securities 110,395 111,424  
Loan operations and lease operations 536,091 497,719 494,851
Other financial assets 75,090 59,568 53,895
(-) Provision for Expected Loss (33,373) (36,737)  
At Fair Value Through Other Comprehensive Income 49,323 52,149 40,039
Securities 49,323 52,149  
At Fair Value Through Profit or Loss 286,646 273,536  
Securities 263,180 250,693  
Derivatives 23,466 22,843  
Financial liabilities - provision for expected loss 3,792 4,922  
Loan Commitments 2,601 3,015 R$ 2,761
Financial Guarantees 1,191 1,907  
Off balance sheet 349,695 323,829  
Credit risk exposure 1,676,631 1,550,321  
Financial Guarantees Provided [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 66,105 70,489  
Letters Of Credit To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 10,747 9,214  
Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 272,843 244,126  
Mortgage loans [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 3,403 3,218  
Overdraft Accounts [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 110,454 93,284  
Credit Cards [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 123,823 111,875  
Other Pre Approved Limits [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 35,163 35,749  
Brazil [Member]      
Disclosure of credit risk exposure [line items]      
Financial Assets 1,027,193 967,703  
At Amortized Cost 756,993 702,672  
Interbank deposits 6,239 6,367  
Securities purchased under agreements to resell 279,353 243,917  
Securities 90,234 101,365  
Loan operations and lease operations 345,501 327,501  
Other financial assets 61,875 53,787  
(-) Provision for Expected Loss (26,209) (30,265)  
At Fair Value Through Other Comprehensive Income 9,089 14,722  
Securities 9,089 14,722  
At Fair Value Through Profit or Loss 261,111 250,309  
Securities 252,819 238,200  
Derivatives 8,292 12,109  
Financial liabilities - provision for expected loss 3,355 4,513  
Loan Commitments 2,289 2,681  
Financial Guarantees 1,066 1,832  
Off balance sheet 300,522 280,032  
Credit risk exposure 1,324,360 1,243,222  
Brazil [Member] | Financial Guarantees Provided [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 53,443 60,062  
Brazil [Member] | Letters Of Credit To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 10,747 9,214  
Brazil [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 236,332 210,756  
Brazil [Member] | Mortgage loans [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 3,403 3,218  
Brazil [Member] | Overdraft Accounts [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 110,454 93,284  
Brazil [Member] | Credit Cards [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 120,862 109,196  
Brazil [Member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 1,613 5,058  
Foreign [member]      
Disclosure of credit risk exposure [line items]      
Financial Assets 303,535 263,711  
At Amortized Cost 237,766 203,057  
Interbank deposits 20,181 22,681  
Securities purchased under agreements to resell 783 790  
Securities 20,161 10,059  
Loan operations and lease operations 190,590 170,218  
Other financial assets 13,215 5,781  
(-) Provision for Expected Loss (7,164) (6,472)  
At Fair Value Through Other Comprehensive Income 40,234 37,427  
Securities 40,234 37,427  
At Fair Value Through Profit or Loss 25,535 23,227  
Securities 10,361 12,493  
Derivatives 15,174 10,734  
Financial liabilities - provision for expected loss 437 409  
Loan Commitments 312 334  
Financial Guarantees 125 75  
Off balance sheet 49,173 43,797  
Credit risk exposure 352,271 307,099  
Foreign [member] | Financial Guarantees Provided [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 12,662 10,427  
Foreign [member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 36,511 33,370  
Foreign [member] | Credit Cards [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet 2,961 2,679  
Foreign [member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member]      
Disclosure of credit risk exposure [line items]      
Off balance sheet R$ 33,550 R$ 30,691