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Cash and cash equivalents and Investments and Additional information on the consolidated statements of cash flows - Cash flows from purchases, sales and maturities of securities (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents and Investments. Additional information on the consolidated statements of cash flows      
Government bonds acquisition $ (3,002) $ (971) $ (1,049)
Sales of Government bonds 1,986 1,051  
Government bonds collection 276 165 45
Other short-term investments and time deposits (2,063) (265)  
Sales of Other short-term investments 176    
Argentine companies notes collection     28
Total $ (2,627) $ (20) $ (976)