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15 Intangible assets (Details Narrative) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 BRL (R$) Municipalities | Dec. 31, 2019 BRL (R$) Municipalities | Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 BRL (R$)
Summary of intangible assets [Line Items] |  |  |  |  |
Intangible assets | R$ 34,405,575 |  | R$ 32,325,447 | R$ 29,012,460 | R$ 33,466,132
Contract asset | 7,969,164 | [1] | 7,617,714 | 7,407,948 | R$ 10,387,715
Program contracts commitments, current | 162,541 |  | 273,932 |  |
Program contracts commitments, noncurrent | 68,939 |  | 103,321 |  |
Capitalized interest and inflation adjustment | R$ 238,330 |  | R$ 233,251 | 488,502 |
Percentage of revenue | 44.58% |  | 44.48% |  |
Construction margin | R$ (86,477) |  | R$ (65,172) | (63,013) |
Discount rate on intangible asset | 8.20% |  | 8.20% |  |
Expropriations | R$ 33,136 |  | R$ 34,681 | R$ 106,429 |
Intangible assets related to PPP ALTO TIETE | 287,645 |  | 348,586 |  |
Intangible assets related to PPP Sao Lourenco | R$ 3,065,445 |  | R$ 3,235,008 |  |
Intangible assets, discount rate for adjustment - PPP | 7.80% |  |  |  |
Amortization average rate | 4.70% |  | 4.20% |  |
Right of use operating expense | R$ 3,157 |  |  |  |
Right of use selling expense | 8,736 |  |  |  |
Right of use administrative expense | 1,950 |  |  |  |
Performance Agreements [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Intangible assets | 265,940 |  | R$ 127,410 |  |
Contract asset | R$ 306,738 |  | R$ 51,650 |  |
Sao paulo [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Number of municipalities | Municipalities | 375 |  | 372 |  |
Percentage of revenue | 7.50% |  |  |  |
Sao paulo [member] | Services agreement [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Percentage of revenue | 13.00% |  |  |  |
Alto Tiete Production System [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Monthly assigned funds from tariffs | R$ 12,064 |  |  |  |
Sao Lourenco Production System [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Monthly assigned funds from tariffs | R$ 34,380 |  |  |  |
[1] | The largest works are located in the municipalities of Sao Paulo, Praia Grande and Sao Bernardo do Campo, in the amounts of R$ 3,727 million, R$ 527 million and R$ 496 million, respectively.

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