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14. Contract asset (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | R$ 10,387,715 |  |
Additions |  | 3,188,943 | R$ 0 | R$ 0
Contract renewal |  | 0 |  |
Transfers of works | [1] | (6,168,710) |  |
Contract assets, ending |  | 7,407,948 | 10,387,715 |
Agreements - equity value |  |  |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | 1,303,552 |  |
Additions |  | 367,199 |  |
Contract renewal |  | (284,856) |  |
Transfers of works | [1] | (475,481) |  |
Contract assets, ending |  | 910,414 | 1,303,552 |
Agreements - economic value |  |  |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | 233,361 |  |
Additions |  | 111,703 |  |
Contract renewal |  | 0 |  |
Transfers of works | [1] | (96,676) |  |
Contract assets, ending |  | 248,388 | 233,361 |
Program contracts |  |  |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | 1,809,257 |  |
Additions |  | 806,554 |  |
Contract renewal |  | 284,856 |  |
Transfers of works | [1] | (676,695) |  |
Contract assets, ending |  | 2,223,972 | 1,809,257 |
Services contracts - São Paulo |  |  |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | 6,733,732 |  |
Additions |  | 1,788,210 |  |
Contract renewal |  | 0 |  |
Transfers of works | [1] | (4,867,158) |  |
Contract assets, ending |  | 3,654,784 | 6,733,732 |
Software license |  |  |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | 533 |  |
Additions |  | 52,183 |  |
Contract renewal |  | 0 |  |
Transfers of works | [1] | (52,700) |  |
Contract assets, ending |  | 16 | 533 |
Inventories |  |  |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | 298,340 |  |
Additions |  | 63,075 |  |
Contract renewal |  | 0 |  |
Transfers of works | [1] | 0 |  |
Contract assets, ending |  | 361,415 | 298,340 |
Advance to suppliers |  |  |  |
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items] |  |  |  |
Contract assets, beginning |  | 8,940 |  |
Additions |  | 19 |  |
Contract renewal |  | 0 |  |
Transfers of works | [1] | 0 |  |
Contract assets, ending |  | R$ 8,959 | R$ 8,940 |
[1] | Work in progress transferred from contract asset to intangible asset.

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- References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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