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14. Intangible assets (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |
Intangible assets, beginning | R$ 31,246,788 | R$ 28,513,626 | R$ 25,979,526
Additions | 3,490,298 | 3,855,831 | 3,604,442
Contract renewal | 0 | 0 | 0
Reversal of estimated losses | 13,380 | (10,198) | 24,085
Transfers | (9,374) | 12,572 | (6,090)
Write-offs and disposals | (24,412) | (14,808) | (45,808)
Amortization | (1,250,548) | (1,110,235) | (1,042,529)
Intangible assets, ending | 33,466,132 | 31,246,788 | 28,513,626
Agreements - equity value |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |
Intangible assets, beginning | 7,482,955 | 7,287,630 | 7,369,271
Additions | 374,775 | 391,545 | 574,421
Contract renewal | (531,818) | (9,587) | (463,362)
Reversal of estimated losses | 2,078 | (1,335) | 747
Transfers | 1,663 | 1,014 | (324)
Write-offs and disposals | (2,795) | (6,233) | (4,303)
Amortization | (185,244) | (180,079) | (188,820)
Intangible assets, ending | 7,141,614 | 7,482,955 | 7,287,630
Agreements - economic value |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |
Intangible assets, beginning | 1,381,652 | 1,353,020 | 1,281,260
Additions | 142,429 | 106,307 | 140,732
Contract renewal | 0 | 0 | 0
Reversal of estimated losses | 8 | (8) | 0
Transfers | 2,604 | 6 | (17)
Write-offs and disposals | (1,163) | (110) | (139)
Amortization | (91,593) | (77,563) | (68,816)
Intangible assets, ending | 1,433,937 | 1,381,652 | 1,353,020
Program contracts |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |
Intangible assets, beginning | 6,576,021 | 6,288,575 | 5,379,153
Additions | 772,278 | 553,126 | 663,399
Contract renewal | 531,818 | 9,587 | 463,362
Reversal of estimated losses | 4,834 | (4,360) | 4,459
Transfers | (1,784) | 2,023 | (752)
Write-offs and disposals | (6,606) | (5,571) | (11,045)
Amortization | (281,495) | (267,359) | (210,001)
Intangible assets, ending | 7,595,066 | 6,576,021 | 6,288,575
Program contracts - commitments |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |
Intangible assets, beginning | 823,216 | 850,530 | 702,909
Additions | 121,313 | 5,762 | 177,424
Contract renewal | 0 | 0 | 0
Reversal of estimated losses | 0 | 0 | 0
Transfers | 0 | 0 | 0
Write-offs and disposals | 0 | 0 | 0
Amortization | (34,154) | (33,076) | (29,803)
Intangible assets, ending | 910,375 | 823,216 | 850,530
Services contracts – São Paulo |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |
Intangible assets, beginning | 14,552,707 | 12,367,017 | 10,986,386
Additions | 1,976,079 | 2,697,724 | 1,900,218
Contract renewal | 0 | 0 | 0
Reversal of estimated losses | 6,460 | (4,495) | 18,879
Transfers | (18,346) | 9,696 | (4,997)
Write-offs and disposals | (13,848) | (2,894) | (30,321)
Amortization | (586,037) | (514,341) | (503,148)
Intangible assets, ending | 15,917,015 | 14,552,707 | 12,367,017
Software license |  |  |
SummaryOfIntangibleAssetsLineItems [Line Items] |  |  |
Intangible assets, beginning | 430,237 | 366,854 | 260,547
Additions | 103,424 | 101,367 | 148,248
Contract renewal | 0 | 0 | 0
Reversal of estimated losses | 0 | 0 | 0
Transfers | 6,489 | (167) | 0
Write-offs and disposals | 0 | 0 | 0
Amortization | (72,025) | (37,817) | (41,941)
Intangible assets, ending | R$ 468,125 | R$ 430,237 | R$ 366,854

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from transfers. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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