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15. Intangible assets (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | R$ 39,668,263 | R$ 42,805,613 |  |
Accumulated amortization | (10,655,803) | (9,339,481) |  |
Net | 29,012,460 | 33,466,132 | R$ 31,246,788 | R$ 28,513,626
Agreements - equity value |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 5,465,206 | 8,893,296 |  |
Accumulated amortization | (1,391,862) | (1,751,682) |  |
Net | 4,073,344 | 7,141,614 | 7,482,955 | 7,287,630
Agreements - economic value |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 1,948,255 | 2,068,402 |  |
Accumulated amortization | (716,246) | (634,465) |  |
Net | 1,232,009 | 1,433,937 | 1,381,652 | 1,353,020
Program contracts |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 12,710,937 | 10,653,292 |  |
Accumulated amortization | (3,933,008) | (3,058,226) |  |
Net | 8,777,929 | 7,595,066 | 6,576,021 | 6,288,575
Program contracts - commitments |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 1,320,106 | 1,113,160 |  |
Accumulated amortization | (240,555) | (202,785) |  |
Net | 1,079,551 | 910,375 | 823,216 | 850,530
Services contracts - Sao Paulo |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 17,474,797 | 19,388,751 |  |
Accumulated amortization | (4,083,345) | (3,471,736) |  |
Net | 13,391,452 | 15,917,015 | 14,552,707 | 12,367,017
Software license |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 748,962 | 688,712 |  |
Accumulated amortization | (290,787) | (220,587) |  |
Net | R$ 458,175 | R$ 468,125 | R$ 430,237 | R$ 366,854

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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 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_c&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 124 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_124_a_iii&doctype=Standard -URIDate 2018-03-16 + Details
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