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15 Intangible assets (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | R$ 32,325,447 |  | R$ 29,012,460 |  | R$ 33,466,132
First-time adoption of IFRS 16 |  |  |  | 64,955 |  |
Transfers to contract assets | [1] |  |  |  |  | (10,387,715)
Additions |  | 411,285 |  | 1,723,952 |  | 1,144,728
Contract renewal |  | 0 |  | 0 |  | 0
Transfers of works | [2] |  |  |  |  | 6,168,710
Transfer to indemnities receivable |  |  |  | (4,345) |  |
Transfer of contract assets |  | 3,688,414 |  | 3,328,317 |  |
Transfers |  | 2,991 |  | (13,531) |  | (1,471)
Write-offs and disposals |  | (16,313) |  | (39,931) |  | (24,866)
Amortization |  | (2,006,249) |  | (1,746,430) |  | (1,353,058)
Intangible assets, ending |  | 34,405,575 |  | 32,325,447 |  | 29,012,460
Concession agreements - equity value [member] |  |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | 1,494,853 | [3] | 4,073,344 |  | 7,141,614
First-time adoption of IFRS 16 |  |  |  | 0 |  |
Transfers to contract assets | [1] |  |  |  |  | (1,427,046)
Additions |  | 1 | [3] | 2 |  | 93
Contract renewal |  | (1,031,830) | [3] | (2,690,660) |  | (1,935,780)
Transfers of works | [2] |  |  |  |  | 499,002
Transfer to indemnities receivable |  |  |  | (4,345) |  |
Transfer of contract assets |  | 47,154 | [3] | 131,809 |  |
Transfers |  | 1,440 | [3] | 76,804 |  | (5,268)
Write-offs and disposals |  | (858) | [3] | (8,311) |  | (1,406)
Amortization |  | (26,985) | [3] | (83,790) |  | (197,865)
Intangible assets, ending |  | 483,775 | [3] | 1,494,853 | [3] | 4,073,344
Concession agreements - economic value [member] |  |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | 712,852 | [4] | 1,232,009 |  | 1,433,937
First-time adoption of IFRS 16 |  |  |  | 0 |  |
Transfers to contract assets | [1] |  |  |  |  | (233,361)
Additions |  | 0 |  | 2,034 |  | 373
Contract renewal |  | 0 |  | (532,173) |  | 0
Transfers of works | [2] |  |  |  |  | 114,442
Transfer to indemnities receivable |  |  |  | 0 |  |
Transfer of contract assets |  | 113,320 |  | 89,041 |  |
Transfers |  | (1,403) |  | 1,956 |  | 88
Write-offs and disposals |  | (42) |  | (569) |  | (1,031)
Amortization |  | (90,062) |  | (79,446) |  | (82,439)
Intangible assets, ending |  | 734,665 |  | 712,852 | [4] | 1,232,009
Program contracts [member] |  |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | 13,819,700 | [3] | 8,777,929 |  | 7,595,066
First-time adoption of IFRS 16 |  |  |  | 0 |  |
Transfers to contract assets | [1] |  |  |  |  | (2,019,461)
Additions |  | 303,472 | [3] | 1,338,443 |  | 928,818
Contract renewal |  | 1,031,830 | [3] | 3,223,773 |  | 1,935,780
Transfers of works | [2] |  |  |  |  | 681,742
Transfer to indemnities receivable |  |  |  | 0 |  |
Transfer of contract assets |  | 2,075,268 | [3] | 970,534 |  |
Transfers |  | (51,570) | [3] | 137,283 |  | 3,011
Write-offs and disposals |  | (5,423) | [3] | (10,312) |  | (7,616)
Amortization |  | (812,970) | [3] | (617,950) |  | (339,411)
Intangible assets, ending |  | 16,360,307 | [3] | 13,819,700 | [3] | 8,777,929
Program contracts - commitments [member] |  |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | 1,364,875 |  | 1,079,551 |  | 910,375
First-time adoption of IFRS 16 |  |  |  | 0 |  |
Transfers to contract assets | [1] |  |  |  |  | 0
Additions |  | 58,323 |  | 331,328 |  | 206,946
Contract renewal |  | 0 |  | 0 |  | 0
Transfers of works | [2] |  |  |  |  | 0
Transfer to indemnities receivable |  |  |  | 0 |  |
Transfer of contract assets |  | 0 |  | 0 |  |
Transfers |  | 0 |  | 0 |  | 0
Write-offs and disposals |  | 0 |  | 0 |  | 0
Amortization |  | (52,275) |  | (46,004) |  | (37,770)
Intangible assets, ending |  | 1,370,923 |  | 1,364,875 |  | 1,079,551
Services contracts - Sao Paulo [member] |  |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | 14,390,763 | [4] | 13,391,452 |  | 15,917,015
First-time adoption of IFRS 16 |  |  |  | 0 |  |
Transfers to contract assets | [1] |  |  |  |  | (6,707,847)
Additions |  | 20,940 |  | 3,867 |  | 3,724
Contract renewal |  | 0 |  | (940) |  | 0
Transfers of works | [2] |  |  |  |  | 4,818,734
Transfer to indemnities receivable |  |  |  | 0 |  |
Transfer of contract assets |  | 1,382,656 |  | 2,054,940 |  |
Transfers |  | (23,645) |  | (228,583) |  | 12
Write-offs and disposals |  | (9,990) |  | (20,739) |  | (14,813)
Amortization |  | (888,120) |  | (809,234) |  | (625,373)
Intangible assets, ending |  | 14,872,604 |  | 14,390,763 | [4] | 13,391,452
Software license [member] |  |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | 471,706 |  | 458,175 |  | 468,125
First-time adoption of IFRS 16 |  |  |  | 0 |  |
Transfers to contract assets | [1] |  |  |  |  | 0
Additions |  | 0 |  | 0 |  | 4,774
Contract renewal |  | 0 |  | 0 |  | 0
Transfers of works | [2] |  |  |  |  | 54,790
Transfer to indemnities receivable |  |  |  | 0 |  |
Transfer of contract assets |  | 70,016 |  | 81,993 |  |
Transfers |  | 78,169 |  | (991) |  | 686
Write-offs and disposals |  |  |  | 0 |  | 0
Amortization |  | (79,266) |  | (67,471) |  | (70,200)
Intangible assets, ending |  | 540,625 |  | 471,706 |  | 458,175
Right of use - other assets [member] |  |  |  |  |  |
Summary of intangible assets [Line Items] |  |  |  |  |  |
Intangible assets, beginning |  | 70,698 |  | 0 |  |
First-time adoption of IFRS 16 |  | 28,549 |  | 64,955 |  |
Additions |  | 0 |  | 48,278 |  |
Contract renewal |  | 0 |  | 0 |  |
Transfer to indemnities receivable |  |  |  | 0 |  |
Transfer of contract assets |  | 0 |  | 0 |  |
Transfers |  | 0 |  | 0 |  |
Write-offs and disposals |  | (56,571) |  | 0 |  |
Amortization |  | R$ 42,676 |  | (42,535) |  |
Intangible assets, ending |  |  |  | R$ 70,698 |  | R$ 0
[1] | Work in progress transferred to contract assets due to adoption of IFRS 15, as of January 1, 2018, as described in Note 4.1.
[2] | Work in progress transferred from contract assets to intangible assets.
[3] | As of December 31, 2020, intangible assets includes leases recognized before December 31, 2018 in accordance with IAS 17 amounting to R$ 269,561 - R$ 76,454 recognized as concession agreements - equity value and R$ 193,107 recognized as program contracts (R$ 292,824 as of December 31, 2019 - R$ 87,266 recognized as concession agreements - equity value and R$ 205,558 recognized as program contracts).
[4] | 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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