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Income tax payables, income tax assets and deferred income tax - Reconciliation of income tax expense (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of income tax expense      
Pre-tax income $ 11,626 $ 5,599 $ 5,127
Non taxable items 738 79 8
Subtotal $ 12,364 $ 5,678 $ 5,135
Weighted statutory income tax rate (*) 34.30% 34.30% 34.50%
Income tax expense at weighted statutory tax rate $ (4,235) $ (1,947) $ (1,774)
Income tax on cash dividends of foreign companies - Nucleo (44) (15) (14)
Effect of changes in tax rate 69    
Other changes in tax assets and liabilities     (2)
Actions for recourse income tax receivable 308 368 98
Income tax expense (3,902) (1,594) (1,692)
Income tax - Actions for recourse filed with the Tax Authority      
Amount of claim filed during 2015 and 2016 509    
Tax credit recorded $ 308 $ 368 $ 98
Argentina      
Reconciliation of income tax expense      
Weighted statutory income tax rate (*) 35.00% 35.00% 35.00%
Paraguay      
Reconciliation of income tax expense      
Weighted statutory income tax rate (*) 10.00% 10.00% 10.00%
Additional tax rate (as a percent) 5.00% 5.00% 5.00%
Effective tax rate 15.00% 15.00% 15.00%
United States of America      
Reconciliation of income tax expense      
Weighted statutory income tax rate (*) 39.50% 39.50% 39.50%
Effective tax rate 39.50% 39.50% 39.50%