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35 Financial Instruments (Details 2) - Liquidity Risk [Member]
R$ in Thousands
Dec. 31, 2019
BRL (R$)
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow R$ 19,131,996
Loans and Financing [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 4,184,163
Debentures [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 10,413,434
Accounts Payable Related To Concession [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,799,880
Suppliers [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,873,193
Ordinary Financing of Taxes With The Federal Tax Authorities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 18,154
Special Tax Regularization Program - Pert [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 605,693
Sectorial Financial Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 108,367
Lease Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 126,999
Less Than 1 Month [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,756,769
Less Than 1 Month [Member] | Loans and Financing [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 31,783
Less Than 1 Month [Member] | Debentures [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 391,329
Less Than 1 Month [Member] | Accounts Payable Related To Concession [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 6,099
Less Than 1 Month [Member] | Suppliers [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,313,913
Less Than 1 Month [Member] | Ordinary Financing of Taxes With The Federal Tax Authorities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 6,037
Less Than 1 Month [Member] | Special Tax Regularization Program - Pert [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 4,122
Less Than 1 Month [Member] | Sectorial Financial Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
Less Than 1 Month [Member] | Lease Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 3,485
1 To 3 Months [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 508,576
1 To 3 Months [Member] | Loans and Financing [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 115,995
1 To 3 Months [Member] | Debentures [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 61,304
1 To 3 Months [Member] | Accounts Payable Related To Concession [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 12,198
1 To 3 Months [Member] | Suppliers [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 291,700
1 To 3 Months [Member] | Ordinary Financing of Taxes With The Federal Tax Authorities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 12,117
1 To 3 Months [Member] | Special Tax Regularization Program - Pert [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 8,282
1 To 3 Months [Member] | Sectorial Financial Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
1 To 3 Months [Member] | Lease Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 6,980
3 Months To 1 Year [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,610,184
3 Months To 1 Year [Member] | Loans and Financing [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 308,094
3 Months To 1 Year [Member] | Debentures [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,049,225
3 Months To 1 Year [Member] | Accounts Payable Related To Concession [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 56,222
3 Months To 1 Year [Member] | Suppliers [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 127,030
3 Months To 1 Year [Member] | Ordinary Financing of Taxes With The Federal Tax Authorities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
3 Months To 1 Year [Member] | Special Tax Regularization Program - Pert [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 37,820
3 Months To 1 Year [Member] | Sectorial Financial Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
3 Months To 1 Year [Member] | Lease Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 31,793
1 to 5 Years [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 10,193,923
1 to 5 Years [Member] | Loans and Financing [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 2,063,354
1 to 5 Years [Member] | Debentures [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 7,256,323
1 to 5 Years [Member] | Accounts Payable Related To Concession [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 336,027
1 to 5 Years [Member] | Suppliers [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 140,550
1 to 5 Years [Member] | Ordinary Financing of Taxes With The Federal Tax Authorities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
1 to 5 Years [Member] | Special Tax Regularization Program - Pert [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 219,788
1 to 5 Years [Member] | Sectorial Financial Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 108,367
1 to 5 Years [Member] | Lease Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 73,515
Over 5 Years [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 5,057,996
Over 5 Years [Member] | Loans and Financing [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,666,502
Over 5 Years [Member] | Debentures [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,655,253
Over 5 Years [Member] | Accounts Payable Related To Concession [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,389,334
Over 5 Years [Member] | Suppliers [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
Over 5 Years [Member] | Ordinary Financing of Taxes With The Federal Tax Authorities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
Over 5 Years [Member] | Special Tax Regularization Program - Pert [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 335,681
Over 5 Years [Member] | Sectorial Financial Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow
Over 5 Years [Member] | Lease Liabilities [Member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow R$ 11,226