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14. Intangible assets (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | R$ 42,805,613 | R$ 39,382,271 |  |
Accumulated amortization | (9,339,481) | (8,135,483) |  |
Net | 33,466,132 | 31,246,788 | R$ 28,513,626 | R$ 25,979,526
Agreements - equity value |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 8,893,296 | 9,222,543 |  |
Accumulated amortization | (1,751,682) | (1,739,588) |  |
Net | 7,141,614 | 7,482,955 | 7,287,630 | 7,369,271
Agreements - economic value |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 2,068,402 | 1,925,361 |  |
Accumulated amortization | (634,465) | (543,709) |  |
Net | 1,433,937 | 1,381,652 | 1,353,020 | 1,281,260
Program contracts |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 10,653,292 | 9,209,367 |  |
Accumulated amortization | (3,058,226) | (2,633,346) |  |
Net | 7,595,066 | 6,576,021 | 6,288,575 | 5,379,153
Program contracts - commitments |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 1,113,160 | 991,848 |  |
Accumulated amortization | (202,785) | (168,632) |  |
Net | 910,375 | 823,216 | 850,530 | 702,909
Services contracts – São Paulo |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 19,388,751 | 17,457,658 |  |
Accumulated amortization | (3,471,736) | (2,904,951) |  |
Net | 15,917,015 | 14,552,707 | 12,367,017 | 10,986,386
Software license |  |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |  |
Cost | 688,712 | 575,494 |  |
Accumulated amortization | (220,587) | (145,257) |  |
Net | R$ 468,125 | R$ 430,237 | R$ 366,854 | R$ 260,547

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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 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 124 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_124_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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