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15 Intangible assets (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | R$ 48,687,584 | R$ 44,626,255 |  |  |
Accumulated amortization | (14,282,009) | (12,300,808) |  |  |
Net | 34,405,575 | 32,325,447 |  | R$ 29,012,460 | R$ 33,466,132
Program contracts - commitments [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | 1,709,757 | 1,651,434 |  |  |
Accumulated amortization | (338,834) | (286,559) |  |  |
Net | 1,370,923 | 1,364,875 |  |  |
Concession agreements - equity value [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | 671,904 | 2,066,459 |  |  |
Accumulated amortization | (188,129) | (571,606) |  |  |
Net | 483,775 | 1,494,853 |  |  |
Concession agreements - economic value [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | 1,446,261 | 1,334,531 |  |  |
Accumulated amortization | (711,596) | (621,679) |  |  |
Net | 734,665 | 712,852 | [1] | 1,232,009 | 1,433,937
Program contracts [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | 23,160,119 | 19,413,768 |  |  |
Accumulated amortization | (6,799,812) | (5,594,068) |  |  |
Net | 16,360,307 | 13,819,700 |  |  |
Services contracts - Sao Paulo [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | 20,579,676 | 19,217,091 |  |  |
Accumulated amortization | (5,707,072) | (4,826,328) |  |  |
Net | 14,872,604 | 14,390,763 | [1] | R$ 13,391,452 | R$ 15,917,015
Software license of use [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | 978,085 | 829,739 |  |  |
Accumulated amortization | (437,460) | (358,033) |  |  |
Net | 540,625 | 471,706 |  |  |
Right of use [member] |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |
Cost | 141,782 | 113,233 |  |  |
Accumulated amortization | (99,106) | (42,535) |  |  |
Net | R$ 42,676 | R$ 70,698 |  |  |
[1] | As of December 31, 2019, intangible assets includes leases recognized before December 31, 2018 in accordance with IAS 17 amounting to R$ 292,824 - (R$ 315,717 as of December 31, 2018 -R$ R$ 98,077 recognized as concession agreements -equity value and R$ 217,640 recognized as program contracts).

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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of intangible assets other than goodwill that would have been recognised had the revalued intangible assets been measured using the cost model after recognition. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 124 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_124_a_iii&doctype=Standard -URIDate 2020-01-01 + Details
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