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17. Investments (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of associates [line items]        
ASSETS R$ 35,930,100 R$ 33,162,377    
Current assets 6,677,846 5,701,834    
Noncurrent assets 29,252,254 27,460,543    
LIABILITIES   33,162,377    
Current liabilities 6,695,114 6,109,914    
Noncurrent liabilities 12,898,772 11,541,960    
Equity 16,336,214 15,510,503 R$ 14,978,142 R$ 14,480,492
STATEMENT OF INCOME        
Net operating revenues 14,934,780 14,024,573 13,101,753  
Operating costs and expenses 11,501,688 10,665,890 10,234,115  
Financial income (expense) 438,050 (748,440)    
Income tax and social contribution 511,993 274,686 519,690  
Net income 1,444,004 1,118,255 874,472  
Total comprehensive income 1,405,644 1,086,917 817,271  
Dona Francisca        
Disclosure of associates [line items]        
ASSETS 134,141 138,079 151,563  
Current assets 12,493 10,304 19,311  
Noncurrent assets 121,648 127,775 132,252  
LIABILITIES 134,141 138,079 151,563  
Current liabilities 4,231 4,144 5,306  
Noncurrent liabilities 3,361 4,443 3,982  
Equity 126,549 129,492 142,275  
STATEMENT OF INCOME        
Net operating revenues 70,716 70,716 70,208  
Operating costs and expenses (25,268) (30,379) (34,074)  
Financial income (expense) 366 835 1,453  
Income tax and social contribution (2,446) (2,632) (3,275)  
Net income 43,368 38,540 34,312  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 43,368 R$ 38,540 R$ 34,312  
Investment interest - % 23.0303% 23.0303% 23.0303%  
Investment book value R$ 29,144 R$ 29,821 R$ 32,766  
Foz do Chopim        
Disclosure of associates [line items]        
ASSETS 106,736 61,163 48,937  
Current assets 73,786 21,553 11,043  
Noncurrent assets 32,950 39,610 37,894  
LIABILITIES 106,736 61,163 48,937  
Current liabilities 57,603 1,808 2,336  
Noncurrent liabilities 26,133 22,776 7,553  
Equity 23,000 36,579 39,048  
STATEMENT OF INCOME        
Net operating revenues 46,479 40,441 40,762  
Operating costs and expenses (2,020) (21,124) (10,130)  
Financial income (expense) (638) 809 795  
Income tax and social contribution (6,880) (1,547) (1,580)  
Net income 36,941 18,579 29,847  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 36,941 R$ 18,579 R$ 29,847  
Investment interest - % 35.77% 35.77% 35.77%  
Investment book value R$ 8,227 R$ 13,084 R$ 13,967