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Lease Commitments as Lessee - Additional Information (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of finance lease and operating lease by lessee [line items]      
Net carrying amount of finance lease assets R$ 16 R$ 4  
General and Administrative Expense [Member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Operating lease expenses R$ (1,566) R$ (1,134) R$ (1,145)