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Financial Instruments and Risk Management - Summary of Net Liabilities in Relation to its Equity (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial liabilities [line items]        
Total liabilities R$ 43,916 R$ 27,910    
Cash and cash equivalents (891) (1,030)    
Total equity 15,939 14,330 R$ 12,934 R$ 12,988
Capital management [member]        
Disclosure of financial liabilities [line items]        
Total liabilities 43,916 27,910    
Cash and cash equivalents (891) (1,030)    
Restricted cash (91) (106)    
Net liabilities 42,934 26,774    
Total equity R$ 15,939 R$ 14,330    
Net liabilities / equity 2.70% 1.87%