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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
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.