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Corporate Bonds Issuance - Summary of Corporate Bond Liabilities (Parenthetical) (Detail) | Apr. 09, 2018 ARS ($) | May 08, 2017 ARS ($) | Nov. 04, 2016 USD ($) | Dec. 31, 2020 ARS ($) | Jan. 29, 2020 ARS ($) | Oct. 16, 2019 ARS ($) | Oct. 17, 2018 ARS ($) | Apr. 27, 2018 USD ($) | May 08, 2017 USD ($) | Apr. 28, 2017 USD ($) | Apr. 26, 2016 USD ($)
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Subordinated Resettable - Class A [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of external credit grades [line items] |  |  |  |  |  |  |  |  |  |  |
Corporate bond fixed rate |  |  | 6.75% |  |  |  |  |  |  |  |
Corporate bond face value |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
Corporate bonds benchmark reset rate |  |  | 546.30% |  |  |  |  |  |  |  |
Subordinated Resettable - Class A [member] | Maximum Average Term [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of external credit grades [line items] |  |  |  |  |  |  |  |  |  |  |
Corporate bond face value |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 | $ 1,000,000,000
Non-subordinated – Class B [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of external credit grades [line items] |  |  |  |  |  |  |  |  |  |  |
Corporate bond face value |  | $ 4,620,570,000 |  | $ 2,377,696,000 |  |  |  |  | $ 300,000,000 |  |
Corporate bond fixed rate |  | 17.50% |  |  |  |  |  |  |  |  |
Corporate bond face value |  |  |  | $ 511,495,000 |  | $ 501,861,000 | $ 1,229,518,000 |  |  |  |
Non-subordinated – Class C [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of external credit grades [line items] |  |  |  |  |  |  |  |  |  |  |
Corporate bond face value | $ 3,207,500,000 |  |  |  | $ 44,000,000 | $ 750,500,000 |  |  |  |  |
Applicable margin rate | 3.50% |  |  |  |  |  |  |  |  |  |
Non-subordinated – Class C [member] | Maximum Average Term [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of external credit grades [line items] |  |  |  |  |  |  |  |  |  |  |
Corporate bond face value |  |  |  |  |  |  |  | $ 2,500,000,000 |  |  |

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