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16 Investments (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [line items]        
ASSETS R$ 46,784,664      
Current assets 11,407,431      
Noncurrent assets 35,377,233      
Current liabilities 9,654,392      
Noncurrent liabilities 16,879,754      
Equity 20,250,518 R$ 17,598,212 R$ 16,336,214 R$ 15,345,579
STATEMENT OF INCOME        
Net operating revenues 18,633,249      
Operating costs and expenses (13,347,822)      
Income tax and social contribution 1,285,365      
Net income 3,909,750      
Total comprehensive income 3,730,595 1,939,685 1,405,644  
Dona Francisca [member]        
Disclosure of associates [line items]        
ASSETS 128,798 130,883 134,141  
Current assets 14,562 13,406 12,493  
Noncurrent assets 114,236 117,477 121,648  
LIABILITIES 128,798 130,883 134,141  
Current liabilities 4,452 4,344 4,231  
Noncurrent liabilities 2,119 3,118 3,361  
Equity 122,227 123,421 126,549  
STATEMENT OF INCOME        
Net operating revenues 70,314 70,717 70,716  
Operating costs and expenses (26,171) (25,957) (25,268)  
Financial income (expense) 208 475 366  
Income tax and social contribution (2,343) (2,454) (2,446)  
Net income 42,008 42,781 43,368  
Total comprehensive income R$ 42,008 R$ 42,781 R$ 43,368  
Investment interest - % 23.0303% 23.0303% 23.0303%  
Investment book value R$ 28,147 R$ 28,423 R$ 29,144  
Foz Do Chopim [member]        
Disclosure of associates [line items]        
ASSETS 62,635 61,635 106,736  
Current assets 33,378 31,054 73,786  
Noncurrent assets 29,257 30,581 32,950  
LIABILITIES 62,635 61,635 106,736  
Current liabilities 34,723 2,354 57,603  
Noncurrent liabilities   25,243 26,133  
Equity 27,912 34,038 23,000  
STATEMENT OF INCOME        
Net operating revenues 55,740 56,929 46,479  
Operating costs and expenses (21,260) (16,278) (2,020)  
Financial income (expense) (5,527) 621 (638)  
Income tax and social contribution (2,035) (2,346) (6,880)  
Net income 26,918 38,926 36,941  
Total comprehensive income R$ 26,918 R$ 38,926 R$ 36,941  
Investment interest - % 35.77% 35.77% 35.77%  
Investment book value R$ 9,986 R$ 12,175 R$ 8,227