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Lease liabilities - Summary of lease liabilities activity (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease liabilities [abstract]    
Balance at the beginning of the year $ 61,780 $ 23,059
Leases increase 11,421 39,779
Financial accretion 5,706 2,885
Leases decrease (28,914) (1,741)
Payments (23,290) (15,208)
Exchange and translation differences, net 19,548 12,999
Result from net monetary position 19 7
Balance at the end of year $ 46,270 $ 61,780