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Deconsolidation of Maxus Entities - Deconsolidation of Comprehensive Income and Cash Flow Statement (Detail) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deconsolidation [Line Items] |  |  |  |
Income |  | $ 17,623 | $ 16,759 | $ 27,263
Financial gain /(loss) |  | (28,629) | (24,944) | (16,016)
Net profit / (loss) for the year |  | 12,672 | (28,379) | 4,426
Operating profit /(loss) |  | 16,073 | (24,246) | 16,588
Other comprehensive income / (loss) | [1] | 21,917 | 27,414 | 43,758
Comprehensive income / (loss) for the year |  | 34,589 | (965) | 48,184
Net cash flow used in operating activities |  | 71,974 | 49,183 | 41,404
Net cash flow used in investments | [2] | (55,242) | (66,174) | (64,049)
Net cash flow provided by financing activities | [2] | (355) | 10,817 | 23,665
Net increase (decrease) in cash and cash equivalents |  | $ 17,981 | $ (4,630) | 5,629
Maxus Entities [Member] |  |  |  |
Deconsolidation [Line Items] |  |  |  |
Income |  |  |  | 197
Financial gain /(loss) |  |  |  | (287)
Net profit / (loss) for the year |  |  |  | (90)
Operating profit /(loss) |  |  |  | (555)
Financial results, net |  |  |  | (15)
Net results |  |  |  | (570)
Other comprehensive income / (loss) |  |  |  | (2)
Comprehensive income / (loss) for the year |  |  |  | (572)
Net cash flow used in operating activities |  |  |  | (186)
Net cash flow used in investments |  |  |  | (85)
Net cash flow provided by financing activities |  |  |  | 0
Net increase (decrease) in cash and cash equivalents |  |  |  | $ (271)
[1] | Entirely assigned to the parent company's shareholders.
[2] | The main investing and financing transactions that have not affected cash and cash equivalents correspond to: 2017 2016 2015 Acquisition of property, plant and equipment and concession extension easements not paid 6,019 6,559 6,799 Net increases (decreases) related to hydrocarbon wells abandonment obligation costs (4,913 ) 2,243 (1,281 ) Contributions in joint ventures 19 - - Dividends to collect - 100 100 Increase in investments in financial assets through a decrease in trade receivables and other receivables - 9,918 - Decrease of loans due to "El Orejano" agreement - - 2,373 Contributions of non-controlling interests - - 50

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