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Fair Value of Financial Instruments - Summary of Carrying and Estimated Fair Values for Financial Instruments (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of fair value measurement of assets and liabilities [Line Items]      
Loan operations and lease operations R$ 536,091 R$ 497,719 R$ 494,851
Financial assets designated at fair value through profit or loss [member]      
Disclosure of fair value measurement of assets and liabilities [Line Items]      
Loan operations and lease operations   R$ 102