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Financial Liabilities Held for Trading - Summary of Financial Liabilities Held for Trading (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities held for trading [Line Items]    
Current R$ 37 R$ 55
Non-Current 155 410
Total 192 465
Shares held for trading [member]    
Disclosure of financial liabilities held for trading [Line Items]    
Current 31 6
Non-Current 9 53
Total 40 59
Debt securities held for trading [member]    
Disclosure of financial liabilities held for trading [Line Items]    
Current 6 49
Non-Current 146 357
Total R$ 152 R$ 406