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Deconsolidation of Maxus Entities - Deconsolidation of Comprehensive Income and Cash Flow Statement (Detail) - ARS ($)
$ in Millions
 12 Months Ended
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