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Marketable Securities - Schedule of Cash Investments (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of investment securities [Line Items]    
Current investments R$ 704 R$ 1,058
Non-current investments 109 30
Investments 813 1,088
Bank certificates of deposit [member]    
Disclosure of investment securities [Line Items]    
Current investments   3
Financial Notes-Banks [member]    
Disclosure of investment securities [Line Items]    
Current investments 435 303
Non-current investments 109  
Treasury financial notes (LFTs) [member]    
Disclosure of investment securities [Line Items]    
Current investments 254 740
Debentures [member]    
Disclosure of investment securities [Line Items]    
Current investments 11 11
Non-current investments   30
Other [member]    
Disclosure of investment securities [Line Items]    
Current investments R$ 4 R$ 1