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Loans - Schedule of Loans (Parenthetical) (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |
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Dec. 31, 2018 ARS ($) | Dec. 31, 2017 ARS ($) | Dec. 31, 2016 ARS ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 ARS ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 ARS ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 ARS ($) | Dec. 31, 2015 ARS ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Repurchase of negotiable obligations |  |  |  |  | $ 410 |  | $ 309 |  | $ 672 |
Loans from banks |  |  |  |  | 335,078 |  | 191,063 |  | 154,345 | $ 105,751
Cancellation of negotiable obligations |  |  |  | $ 15,850 | 2,634 | $ 15,850 | 1,528 | $ 11,248 | 3,253 |
Proceeds from loans | $ 39,673 | $ 54,719 | $ 101,322 |  |  |  |  |  |  |
Banco Nacion Argentina [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Loans from banks |  |  |  |  | $ 500 |  | 2,500 |  | 2,105 |
Bank overdrafts |  |  |  |  |  |  |  |  | 1,440 |
Banco Nacion Argentina [member] | Badlar Variable Rate Plus Margin of 3.5 Percentage [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Loans accrued |  |  |  |  |  |  | $ 1,500 |  | $ 2,000 |
Interest rate |  |  |  | 3.50% | 3.50% | 3.50% | 3.50% | 3.50% | 3.50% |
Banco Nacion Argentina [member] | Fixed interest rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Loans accrued |  |  |  |  |  |  | $ 1,000 |  |  |
Interest rate |  |  |  |  |  | 20.00% | 20.00% |  |  |
Banco Nacion Argentina [member] | Badlar Variable Rate Plus Spread of 4 Percentage [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Loans accrued |  |  |  |  |  |  |  |  | $ 105 |
Interest rate |  |  |  |  |  |  |  | 4.00% | 4.00% |
Export Pre financing [member] | Banco Nacion Argentina [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Loans from banks |  |  |  |  | $ 5,264 |  |  |  |  |
Export Pre financing [member] | Banco Nacion Argentina [member] | Two percentage fixed interest rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Loans accrued |  |  |  |  | $ 3,008 |  | $ 1,116 |  |  |
Interest rate |  |  |  | 2.00% | 2.00% | 2.00% | 2.00% |  |  |
Export Pre financing [member] | Banco Nacion Argentina [member] | Six point five percentage fixed interest rate [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Loans accrued |  |  |  |  | $ 2,256 |  |  |  |  |
Interest rate |  |  |  | 6.50% | 6.50% |  |  |  |  |
Negotiable obligations and financial loans secured by cash flows [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Proceeds from loans |  | $ 492 | $ 4,960 |  |  |  |  |  |  |

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