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Investments in Associates and Joint Ventures - Summary of Income from Equity Interests in Associates and Joint Ventures (Detail) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Investments in Associates and Joint Ventures [Line Items] |  |  |  |
Net profit / (loss) for the year |  | $ 12,672 | $ (28,379) | $ 4,426
Other comprehensive income | [1] | 21,917 | 27,414 | 43,758
Comprehensive income / (loss) for the year |  | 34,589 | (965) | 48,184
Joint Ventures [member] |  |  |  |
Disclosure of Investments in Associates and Joint Ventures [Line Items] |  |  |  |
Net profit / (loss) for the year |  | 885 | 363 | (3)
Other comprehensive income |  | 628 | 566 | 949
Comprehensive income / (loss) for the year |  | 1,513 | 929 | 946
Associates [member] |  |  |  |
Disclosure of Investments in Associates and Joint Ventures [Line Items] |  |  |  |
Net profit / (loss) for the year |  | 543 | 225 | 321
Other comprehensive income |  | 34 | 35 | 50
Comprehensive income / (loss) for the year |  | $ 577 | $ 260 | $ 371
[1] | Entirely assigned to the parent company's shareholders.

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