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Non-Cash Transactions - Additional Information (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Non Cash Activities [line items]      
Capitalized financial costs R$ 31 R$ 71 R$ 142
Consideration paid for acquisition of additional equity interest 104    
Cash arising from acquisition of additional equity interest 67    
Parajuru [member]      
Disclosure Of Non Cash Activities [line items]      
Payment of cash arising from acquisition of the subsidiaries 4    
Volta do Rio [member]      
Disclosure Of Non Cash Activities [line items]      
Payment of cash arising from acquisition of the subsidiaries R$ 5