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11. BORROWINGS, FINANCING AND DEBENTURES (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 22,983,942 R$ 28,323,570
Maturity percent 100.00%  
2019    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 7,239,968  
Maturity percent 31.00%  
2019 | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 2,824,551  
2019 | Bonds    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing [1] 2,238,034  
2019 | CCB    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 1,507,000  
2019 | Others    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 670,383  
2020    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 7,572,510  
Maturity percent 33.00%  
2020 | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 2,409,959  
2020 | Bonds    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing [1] 3,374,308  
2020 | CCB    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 1,508,000  
2020 | Others    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 280,243  
2021    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 2,228,628  
Maturity percent 10.00%  
2021 | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 1,276,969  
2021 | CCB    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 774,000  
2021 | Others    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 177,659  
2022    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 1,843,847  
Maturity percent 8.00%  
2022 | Prepayment    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 964,363  
2022 | CCB    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 784,000  
2022 | Others    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 95,484  
2023    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 176,631  
Maturity percent 1.00%  
2023 | CCB    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 120,000  
2023 | Others    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing 56,631  
After 2023    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 648,369  
Maturity percent 3.00%  
After 2023 | Others    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 648,369  
Perpetual bonds    
Disclosure of detailed information about borrowings [line items]    
Maturities of borrowings and financing R$ 3,308,000  
Maturity percent 14.00%  
[1] In February 2018, the Company concluded the renegotiation of its debt with Banco do Brasil S.A ("BB"), as well as the issuance of debt instruments and repurchase of US$350 million (Tender Offer), as described in more detail in note 31 - Events subsequent.