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Financial Assets Held for Trading and Designated at Fair Value Through Profit or Loss - Summary of Cost and Fair Value by Maturity of Financial Assets Designated as Fair Value Through Profit or Loss (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current R$ 1,035 R$ 1,269
Cost [Member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current 592 765
Non-current 424 467
Cost [Member] | Up to one year [member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current 592 765
Cost [Member] | From one to five years [member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Non-current 424 467
Fair value [Member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current 609 799
Non-current 426 470
Fair value [Member] | Up to one year [member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current 609 799
Fair value [Member] | From one to five years [member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Non-current R$ 426 R$ 470