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Financial Instruments and Risk Management - Summary of Put Option (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Put option R$ 815 R$ 1,341
Put option for shares in RME and Lepsa [member] | Put Option 1 [member]    
Disclosure of detailed information about financial instruments [line items]    
Put option 507 1,150
Put option - SAAG [member] | Put Option 1 [member]    
Disclosure of detailed information about financial instruments [line items]    
Put option 312 196
Put / call options - Ativas and Sonda [member] | Put Option 1 [member]    
Disclosure of detailed information about financial instruments [line items]    
Put option R$ (4) R$ (5)