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Income Tax - Summary of Reconciliation between the Charge to Net Income for Income Tax and the One that would Result from Applying the Prevailing Tax Rate on Net Income Before Income Tax Arising from the Consolidated Statements of Comprehensive Income (Detail) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |
Net income before income tax | $ 90,144 | $ 8,703 | $ (29,804)
Statutory tax rate | 30.00% | 35.00% | 35.00%
Statutory tax rate applied to net income before income tax | $ (27,043) | $ (3,046) | $ 10,431
Effect of the valuation of property, plant and equipment and intangible assets measured in functional currency | (100,760) | (18,185) | (19,543)
Exchange differences | 67,767 | 12,318 | 12,237
Effect of the valuation of inventories | (8,666) | (1,558) | (1,819)
Income on investments in associates and joint ventures | 1,452 | 500 | 206
Effect by change of tax rate | 12,795 | 13,892 |
Result of companies' revaluation | 3,594 |  |
Miscellaneous | (677) | 48 | (87)
Income tax | $ (51,538) | $ 3,969 | $ 1,425

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