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2 Concessions and Authorizations (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about service concession arrangements [line items]      
Accounts receivable related to the concession R$ 2,617,638 R$ 2,550,691  
Intangible assets 6,332,611 6,029,097  
Amortization (372) (373)  
End of concession in 2024 [Member]      
Disclosure of detailed information about service concession arrangements [line items]      
Accounts receivable related to the concession 144,813 148,720 R$ 148,868
Intangible assets 127,598 152,538 198,688
Fair value of assets from the indemnity for the concession 9,181 9,184 (197)
Amortization (28,854) (29,012)  
Adjustments [Member]      
Disclosure of detailed information about service concession arrangements [line items]      
Accounts receivable related to the concession 179,572 199,257 154,800
Intangible assets (127,598) (148,919) (154,800)
Fair value of assets from the indemnity for the concession 1,234 3,009 41,078
Amortization 400 6,253  
End of concession in 2019 [Member]      
Disclosure of detailed information about service concession arrangements [line items]      
Accounts receivable related to the concession 324,385 347,977 303,668
Intangible assets 3,619 43,888
Fair value of assets from the indemnity for the concession 10,415 12,193 R$ 40,881
Amortization R$ (28,454) R$ (22,759)