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Income Tax - Summary of Calculation of Income Tax Expense Accrued (Detail) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Current income tax $ (943) $ (605) $ (734)
Deferred income tax (50,595) 4,574 2,159
Income tax expense $ (51,538) $ 3,969 $ 1,425