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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) |

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