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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, 2018
Dec. 31, 2017
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current R$ 1,269 R$ 1,746
Gross carrying amount [member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current 765 1,006
Non-current 467 664
Gross carrying amount [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 765 1,006
Gross carrying amount [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 467 664
Fair value [Member]    
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items]    
Current 799 1,041
Non-current 470 705
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 799 1,041
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$ 470 R$ 705