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Operating expenses - Commissions (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating expenses      
Agent commissions $ (2,602) $ (3,078) $ (2,659)
Agent commissions capitalized as SAC (Note 3.j) 986 1,403 1,172
Distribution of prepaid cards commissions (842) (763) (635)
Collection commissions (1,147) (1,295) (983)
Other commissions (26) (116) (88)
Total fee and commission expense $ (3,631) $ (3,849) $ (3,193)