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Loans - Schedule of Loans (Parenthetical) (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
ARS ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
ARS ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
ARS ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
ARS ($)
Disclosure of detailed information about borrowings [line items]              
Repurchase of negotiable obligations     $ 326   $ 410    
Loans accrued $ 678,306   526,760   335,078   $ 191,063
Cancellation of negotiable obligations 20,496   4,643   2,634    
Cancellation of negotiable obligations in U.S. dollars   $ 4,602   $ 15,850   $ 15,850  
Banco Nacion Argentina [member]              
Disclosure of detailed information about borrowings [line items]              
Loans accrued         500    
Export Pre financing [member] | Banco Nacion Argentina [member]              
Disclosure of detailed information about borrowings [line items]              
Loans accrued $ 4,791   $ 4,933   $ 5,264    
Interest rate 5.85% 5.85% 6.89% 6.89% 3.93% 3.93%