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Securities - Schedule of Cash Investments (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of investment securities [Line Items]    
Current investments R$ 1,058 R$ 1,014
Non-current investments 30 31
Investments 1,088 1,045
Bank certificates of deposit [member]    
Disclosure of investment securities [Line Items]    
Current investments 3 46
Financial Notes-Banks [member]    
Disclosure of investment securities [Line Items]    
Current investments 303 728
Non-current investments   14
Treasury financial notes (LFTs) [member]    
Disclosure of investment securities [Line Items]    
Current investments 740 193
Debentures [member]    
Disclosure of investment securities [Line Items]    
Current investments 11 45
Non-current investments 30 17
Other [member]    
Disclosure of investment securities [Line Items]    
Current investments R$ 1 R$ 2