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Financial instruments - Gains and losses (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financial instruments.    
Net gain (loss) on financial assets at amortised cost $ 2,211 $ 707
Net gain (loss) on financial liabilities at amortised cost (3,213) (3,010)
Net gain (loss) on financial assets at fair value through profit or loss 904 305
Net gain (loss) on financial liabilities at fair value through profit or loss 3 (1)
Total gain (loss) on financial instruments (95) (1,999)
Interest on financial assets at amortised cost 947 374
Interest on financial liabilities at amortised cost (940) (1,667)
Total interest income (expense) on financial instruments 7 (1,293)
Other short-term investments    
Financial instruments.    
Net gain (loss) on financial assets at fair value through profit or loss 121 61
NDF    
Financial instruments.    
Net gain (loss) on financial assets at fair value through profit or loss   6
Tuve's Paraguay S.A shares purchase option    
Financial instruments.    
Net gain (loss) on financial assets at fair value through profit or loss   11
Government bonds    
Financial instruments.    
Net gain (loss) on financial assets at fair value through profit or loss $ 783 $ 227