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16 Investments (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jan. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [line items]          
ASSETS   R$ 38,312,550 R$ 35,930,100    
Current assets   7,909,196 6,677,846    
Noncurrent assets   30,403,354 29,252,254    
Current liabilities   5,345,621 6,695,114    
Noncurrent liabilities   15,368,717 12,898,772    
Equity   17,598,212 16,336,214 R$ 15,510,503 R$ 14,978,142
STATEMENT OF INCOME          
Net operating revenues   16,244,274 14,934,780 14,024,573  
Operating costs and expenses   (11,760,176) (11,501,688) (10,665,890)  
Income tax and social contribution   639,326 511,993 274,686  
Net income R$ 2,070,551 2,062,869 1,444,004 1,118,255  
Total comprehensive income   1,939,685 1,405,644 1,086,917  
Dona Francisca [Member]          
Disclosure of associates [line items]          
ASSETS   130,883 134,141 138,079  
Current assets   13,406 12,493 10,304  
Noncurrent assets   117,477 121,648 127,775  
LIABILITIES   130,883 134,141 138,079  
Current liabilities   4,344 4,231 4,144  
Noncurrent liabilities   3,118 3,361 4,443  
Equity   123,421 126,549 129,492  
STATEMENT OF INCOME          
Net operating revenues   70,717 70,716 70,716  
Operating costs and expenses   (25,957) (25,268) (30,379)  
Financial income (expense)   475 366 835  
Income tax and social contribution   (2,454) (2,446) (2,632)  
Net income   42,781 43,368 38,540  
Other comprehensive income    
Total comprehensive income   R$ 42,781 R$ 43,368 R$ 38,540  
Investment interest - %   23.0303% 23.0303% 23.0303%  
Investment book value   R$ 28,423 R$ 29,144 R$ 29,821  
Foz Do Chopim [Member]          
Disclosure of associates [line items]          
ASSETS   61,635 106,736 61,163  
Current assets   31,054 73,786 21,553  
Noncurrent assets   30,581 32,950 39,610  
LIABILITIES   61,635 106,736 61,163  
Current liabilities   2,354 57,603 1,808  
Noncurrent liabilities   25,243 26,133 22,776  
Equity   34,038 23,000 36,579  
STATEMENT OF INCOME          
Net operating revenues   56,929 46,479 40,441  
Operating costs and expenses   16,278 (2,020) (21,124)  
Financial income (expense)   621 (638) 809  
Income tax and social contribution   (2,346) (6,880) (1,547)  
Net income   38,926 36,941 18,579  
Other comprehensive income    
Total comprehensive income   R$ 38,926 R$ 36,941 R$ 18,579  
Investment interest - %   35.77% 35.77% 35.77%  
Investment book value   R$ 12,175 R$ 8,227 R$ 13,084