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Cash and cash equivalents and Investments and Additional information on the consolidated statements of cash flows - Changes in assets/liabilities components (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net decrease (increase) in assets      
Trade receivables $ (2,072) $ (2,773) $ (2,364)
Other receivables (902) 276 (754)
Inventories (618) 837 (1,522)
Total (3,592) (1,660) (4,640)
Net increase (decrease) in liabilities      
Trade payables 1,067 (1,391) 1,368
Deferred revenues 51 (58) (48)
Salaries and social security payables 513 369 221
Other taxes payables 982 13 483
Other liabilities 68 62 29
Provisions (Note 17) (360) (174) (163)
Total $ 2,321 $ (1,179) $ 1,890