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Earning Per Share - Summary of Earnings Per Share (Detail) - ARS ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings per share [abstract]      
Net profit (loss) $ 38,613 $ 12,340 $ (28,237)
Average number of shares outstanding 392,302,437 392,625,259 391,497,615
Basic and diluted earnings per share $ 98.43 $ 31.43 $ (72.13)