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Risk and Capital Management - Summary of Funds Obtained Through the Issuance of Subordinated Debt Securities (Detail)
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Account balance R$ 35,205,000,000
Brazil, Brazil Real  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Principal amount (original currency) 2,470,000,000
Account balance R$ 4,902,000,000
Brazil, Brazil Real | Subordinated financial bills eight [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Issue 2012
Maturity 2019
Return p.a. 110% of CDI
Principal amount (original currency) R$ 2,000,000
Account balance R$ 4,000,000
Brazil, Brazil Real | Subordinated financial bills nine [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Return p.a. 11.96
Principal amount (original currency) R$ 1,000,000
Account balance R$ 2,000,000
Brazil, Brazil Real | Subordinated financial bills ten [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Return p.a. IPCA + 4.7% to 6.3%
Principal amount (original currency) R$ 12,000,000
Account balance R$ 26,000,000
Brazil, Brazil Real | Subordinated financial bills eleven [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Issue 2012
Maturity 2020
Return p.a. 111% of CDI
Principal amount (original currency) R$ 101,000,000
Account balance R$ 187,000,000
Brazil, Brazil Real | Subordinated financial bills twelve [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Return p.a. IPCA + 6% to 6.17%
Principal amount (original currency) R$ 1,000,000
Account balance R$ 2,000,000
Brazil, Brazil Real | Subordinated financial bills thirteen [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Issue 2011
Maturity 2021
Return p.a. 109.25% to 110.5% of CDI
Principal amount (original currency) R$ 20,000,000
Account balance R$ 44,000,000
Brazil, Brazil Real | Subordinated financial bills fourteen [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Issue 2012
Maturity 2022
Return p.a. IPCA + 5.15% to 5.83%
Principal amount (original currency) R$ 6,000,000
Account balance R$ 13,000,000
Brazil, Brazil Real | Subordinated financial bills fifteen [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Return p.a. IGPM + 4.63%
Principal amount (original currency) R$ 2,307,000,000
Account balance 4,595,000,000
Brazil, Brazil Real | Subordinated financial bills sixteen [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Principal amount (original currency) 20,000,000
Account balance R$ 29,000,000
Brazil, Brazil Real | Subordinated financial bills six [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Issue 2011
Maturity 2019
Return p.a. 109% to 109.7% of CDI
United States of America, Dollars  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Principal amount (original currency) R$ 7,721,000,000
Account balance R$ 30,303,000,000
United States of America, Dollars | Subordinated financial bills sixteen [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency USD
Issue 2010
Maturity 2020
Return p.a. 6.20
United States of America, Dollars | Subordinated euronotes [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Principal amount (original currency) R$ 990,000,000
Account balance R$ 3,881,000,000
United States of America, Dollars | Subordinated euronotes one [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency USD
Issue 2010
Maturity 2021
Return p.a. 5.75
Principal amount (original currency) R$ 1,000,000,000
Account balance R$ 3,987,000,000
United States of America, Dollars | Subordinated euronotes two [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency USD
Issue 2011
Maturity 2021
Return p.a. 5.75% to 6.20%
Principal amount (original currency) R$ 730,000,000
Account balance R$ 2,839,000,000
United States of America, Dollars | Subordinated euronotes three [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency USD
Issue 2012
Maturity 2021
Return p.a. 6.20
Principal amount (original currency) R$ 550,000,000
Account balance R$ 2,131,000,000
United States of America, Dollars | Subordinated euronotes four [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency USD
Issue 2012
Maturity 2022
Return p.a. 5.50% to 5.65%
Principal amount (original currency) R$ 2,600,000,000
Account balance R$ 10,256,000,000
United States of America, Dollars | Subordinated euronotes five [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency USD
Issue 2012
Maturity 2023
Return p.a. 5.13
Principal amount (original currency) R$ 1,851,000,000
Account balance R$ 7,209,000,000