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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, 2019
BRL (R$)
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Account balance R$ 36,627,000,000
Subordinated financial bills one [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Issue 2012
Maturity 2020
Brazil, Brazil Real  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Principal amount (original currency) R$ 2,354,000,000
Account balance R$ 5,089,000,000
Brazil, Brazil Real | Subordinated financial bills one [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Return p.a. 111% of CDI
Principal amount (original currency) R$ 1,000,000
Account balance R$ 2,000,000
Brazil, Brazil Real | Subordinated financial bills two [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. IPCA + 6% to 6.17%
Principal amount (original currency) R$ 20,000,000
Account balance R$ 49,000,000
Brazil, Brazil Real | Subordinated financial bills three [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. 109.25% to 110.5% of CDI
Principal amount (original currency) R$ 6,000,000
Account balance R$ 14,000,000
Brazil, Brazil Real | Subordinated financial bills four [Member]  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Name of currency BRL
Return p.a. IPCA + 5.15% to 5.83%
Principal amount (original currency) R$ 2,307,000,000
Account balance R$ 4,994,000,000
Brazil, Brazil Real | Subordinated financial bills five [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$ 20,000,000
Account balance 30,000,000
United States of America, Dollars  
Disclosure of assets and liabilities according to their remaining contractual maturities [Line Items]  
Principal amount (original currency) 7,721,000,000
Account balance R$ 31,538,000,000
United States of America, Dollars | Subordinated euronotes [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
Principal amount (original currency) R$ 990,000,000
Account balance R$ 4,041,000,000
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$ 4,152,000,000
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$ 2,952,000,000
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$ 2,218,000,000
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$ 10,673,000,000
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$ 7,502,000,000