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35 Financial Instruments (Details 2) - Liquidity risk [member]
R$ in Thousands
Dec. 31, 2020
BRL (R$)
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow R$ 21,608,258
Loans and Financing [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 4,334,551
Debentures [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 8,080,174
Accounts payable related to concession [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 2,090,725
Accounts payable to suppliers [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 2,436,452
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 3,927,823
Special Tax Regularization Program - Pert [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 547,290
Sectorial financial liabilities [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 191,243
Less than 1 month [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 2,426,459
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 29,274
Less than 1 month [member] | Debentures [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 335,121
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 7,220
Less than 1 month [member] | Accounts payable to suppliers [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 2,034,872
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
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 4,220
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 15,752
1 to 3 months [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 608,556
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 197,056
1 to 3 months [member] | Debentures [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 47,686
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 14,444
1 to 3 months [member] | Accounts payable to suppliers [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 309,329
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
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 8,456
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 31,585
3 months to 1 year [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 2,791,182
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 669,153
3 months to 1 year [member] | Debentures [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,723,107
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 68,504
3 months to 1 year [member] | Accounts payable to suppliers [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 26,248
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 121,838
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 38,426
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 143,906
1 to 5 Years [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 11,051,010
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 1,570,564
1 to 5 Years [member] | Debentures [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 4,953,679
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 429,573
1 to 5 Years [member] | Accounts payable to suppliers [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 66,003
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 3,805,985
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 225,206
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
Over 5 Years [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 4,731,051
Over 5 Years [member] | Loans and Financing [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,868,504
Over 5 Years [member] | Debentures [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow 1,020,581
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 1,570,984
Over 5 Years [member] | Accounts payable to 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 270,982
Over 5 Years [member] | Sectorial financial liabilities [member]  
Disclosure of detailed information about financial instruments [line items]  
Total financial liabilities under undiscounted cash flow