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Risk and Capital Management - Summary of Funds Obtained Through the Issuance of Subordinated Debt Securities (Parenthetical) (Detail)
Dec. 31, 2018
Brazil, Brazil Real | Subordinated financial bills eight [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 111.00%
Brazil, Brazil Real | Subordinated financial bills nine [Member] | Bottom of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 109.25%
Brazil, Brazil Real | Subordinated financial bills nine [Member] | Top of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 110.50%
Brazil, Brazil Real | Subordinated financial bills ten [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 11.96%
Brazil, Brazil Real | Subordinated financial bills eleven [Member] | Bottom of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 4.70%
Brazil, Brazil Real | Subordinated financial bills eleven [Member] | Top of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 6.30%
Brazil, Brazil Real | Subordinated financial bills thirteen [Member] | Bottom of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 6.00%
Brazil, Brazil Real | Subordinated financial bills thirteen [Member] | Top of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 6.17%
Brazil, Brazil Real | Subordinated financial bills fifteen [Member] | Bottom of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 5.15%
Brazil, Brazil Real | Subordinated financial bills fifteen [Member] | Top of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 5.83%
Brazil, Brazil Real | Subordinated financial bills sixteen [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 4.63%
Brazil, Brazil Real | Subordinated financial bills six [Member] | Bottom of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 109.00%
Brazil, Brazil Real | Subordinated financial bills six [Member] | Top of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 109.70%
Brazil, Brazil Real | Subordinated financial bills seven [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate basis adjustment 110.00%
United States of America, Dollars | Subordinated euronotes [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 6.20%
United States of America, Dollars | Subordinated euronotes one [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 5.75%
United States of America, Dollars | Subordinated euronotes two [Member] | Bottom of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 5.75%
United States of America, Dollars | Subordinated euronotes two [Member] | Top of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 6.20%
United States of America, Dollars | Subordinated euronotes three [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 6.20%
United States of America, Dollars | Subordinated euronotes four [Member] | Bottom of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 5.50%
United States of America, Dollars | Subordinated euronotes four [Member] | Top of range [member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 5.65%
United States of America, Dollars | Subordinated euronotes five [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Borrowings interest rate 5.13%