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Related Parties - Additional Information (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Text Block [Abstract]    
Assets R$ 48 R$ 31
Revenue 7 2
Liability (5,757) (4,391)
Expense R$ (35) R$ (16)