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Loans, Financings and Debentures - Summary of Guarantees of the Debtor Balance on Loans and Financings (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 14,772 R$ 14,398
Shares [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,141  
Unsecured [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 157  
Financial guarantee contracts [member] | Promissory Notes And Sureties [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 9,590  
Financial guarantee contracts [member] | Receivables [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 3,884