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Employee Benefit Plans and Similar Obligations - Summary of Share Based Compensation Plan (Plan 2018-2021) (Detail) - Plan 2018-21 [member] $ in Millions | 12 Months Ended
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Dec. 31, 2020 ARS ($) | Dec. 31, 2020 $ / shares | Dec. 31, 2019 ARS ($) | Dec. 31, 2019 $ / shares | Dec. 31, 2018 ARS ($) | Dec. 31, 2018 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Amount at the beginning of the fiscal year | 508,458 |  | 761,512 |  |  |
- Granted |  |  |  |  | 761,512 |
Settled | (246,457) |  | (246,987) |  |  |
- Expired | (24,919) |  | (6,067) |  |  |
Amount at end of fiscal year | 237,082 |  | 508,458 |  | 761,512 |
Expense recognized during the fiscal year | $ | $ 127 |  | $ 212 |  | $ 100 |
Fair value of shares on grant date (in U.S. dollars) | $ / shares |  | $ 13.60 |  | $ 13.60 |  | $ 13.60

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