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Financial Assets Held for Trading and Designated at Fair Value Through Profit or Loss - Summary of Financial Assets Designated at Fair Value Through Profit or Loss (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets designated as measured at fair value through profit or loss [Line Items]    
Fair value R$ 322,929 R$ 286,646
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]    
Disclosure of financial assets designated as measured at fair value through profit or loss [Line Items]    
Cost 1,016 1,232
Accumulated gain / (loss) reflected in income 19 37
Fair value 1,035 1,269
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] | Brazilian external debt bonds [Member]    
Disclosure of financial assets designated as measured at fair value through profit or loss [Line Items]    
Cost 1,016 1,232
Accumulated gain / (loss) reflected in income 19 37
Fair value R$ 1,035 R$ 1,269