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Employee Benefit Plans and Similar Obligations - Summary of Share Based Compensation Plan (Plan 2014-2017) (Detail) - Plan 2014-17 [member] $ in Millions | 12 Months Ended
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Dec. 31, 2017 ARS ($) | Dec. 31, 2017 $ / shares | Dec. 31, 2016 ARS ($) | Dec. 31, 2016 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Amount at the beginning of the year | 99,278 |  | 234,130 |
Granted | 6,269 |  | 6,978 |
Settled | (105,201) |  | (123,926) |
Expired | (346) |  | (17,904) |
Amount at end of year |  |  | 99,278 |
Expense recognized during the year | $ | $ 8 |  | $ 28 |
Fair value of shares on grant date (in U.S. dollars) | $ / shares |  | $ 33.41 |  | $ 33.41

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