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13. FINANCIAL INSTRUMENTS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss R$ 2,284,043 R$ 2,952
Other assets measured at amortized costs 6,806,001 41,528
Total assets 9,090,044 9,188,434
Fair value of liabilities through profit loss 33,348,569
Other liabilities measured at amortized costs 33,348,569 32,541,183
Total liabilities   32,541,183
Current assets    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss 4,854 2,952
Other assets measured at amortized costs 5,270,745 41,528
Total assets 5,275,599 6,391,283
Current assets | Cash and cash equivalants    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss  
Other assets measured at amortized costs 2,248,004
Total assets 2,248,004 3,411,572
Current assets | Short-term investments    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss  
Other assets measured at amortized costs 895,713
Total assets 895,713 735,712
Current assets | Trade receivables    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss  
Other assets measured at amortized costs 2,078,182
Total assets 2,078,182 2,197,078
Current assets | Dividends receivable    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss  
Other assets measured at amortized costs 46,171 41,528
Total assets 46,171 41,528
Current assets | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss 351
Other assets measured at amortized costs  
Total assets 351  
Current assets | Trading securities    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss 4,503 2,952
Other assets measured at amortized costs  
Total assets 4,503 2,952
Current assets | Loans - related parties    
Disclosure of detailed information about financial instruments [line items]    
Other assets measured at amortized costs 2,675  
Total assets 2,675  
Non-current assets    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss 2,279,189
Other assets measured at amortized costs 1,535,256
Total assets 3,814,445 2,797,151
Non-current assets | Loans - related parties    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss  
Other assets measured at amortized costs 706,605
Total assets 706,605 554,694
Non-current assets | Short-term investments    
Disclosure of detailed information about financial instruments [line items]    
Other assets measured at amortized costs 7,772  
Total assets 7,772  
Non-current assets | Other trade receivables    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss  
Other assets measured at amortized costs 820,879
Total assets 820,879 20,024
Non-current assets | Investments    
Disclosure of detailed information about financial instruments [line items]    
Fair value of assets through profit loss 2,279,189
Other assets measured at amortized costs  
Total assets 2,279,189 2,222,433
Current liabilities    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 10,087,624
Other liabilities measured at amortized costs 10,087,624 9,523,230
Total liabilities   9,523,230
Current liabilities | Derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss  
Other liabilities measured at amortized costs  
Total liabilities  
Current liabilities | Borrowings and financing    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 5,681,797
Other liabilities measured at amortized costs 5,681,797 6,551,764
Total liabilities   6,551,764
Current liabilities | Trade payables    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 3,473,822
Other liabilities measured at amortized costs 3,473,822 2,460,774
Total liabilities   2,460,774
Current liabilities | Dividends and JCP    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 932,005
Other liabilities measured at amortized costs 932,005 510,692
Total liabilities   510,692
Non-current liabilities    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 23,260,945
Other liabilities measured at amortized costs 23,260,945 23,017,953
Total liabilities   23,017,953
Non-current liabilities | Borrowings and financing    
Disclosure of detailed information about financial instruments [line items]    
Fair value of liabilities through profit loss 23,260,945
Other liabilities measured at amortized costs R$ 23,260,945 23,017,953
Total liabilities   R$ 23,017,953