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Operating expenses - Taxes and fees with the Regulatory Authority (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating expenses      
Turnover tax $ (3,528) $ (2,817) $ (2,122)
Taxes with the Regulatory Authority (1,049) (1,078) (917)
Tax on deposits to and withdrawals from bank accounts (626) (539) (403)
Municipal taxes (531) (395) (289)
Other taxes (373) (296) (212)
Total taxes and fees with the regulatory authority $ (6,107) $ (5,125) $ (3,943)