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Financial risk management - Credit risk (Details) - ARS ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Credit risk
Credit risk exposure
Total financial assets	$ 18,016
Maximum holding period of deposits	3 months
Credit risk | Due
Credit risk exposure
Total financial assets	$ 1,807
Credit risk | Not due
Credit risk exposure
Total financial assets	16,209
Cash and cash equivalents | Credit risk
Credit risk exposure
Total financial assets	2,831
Cash and cash equivalents | Credit risk | Not due
Credit risk exposure
Total financial assets	2,831
Investments | Credit risk
Credit risk exposure
Total financial assets	6,082
Investments | Credit risk | Not due
Credit risk exposure
Total financial assets	6,082
Trade receivables
Credit risk exposure
Overdue balances not covered by the allowance for doubtful accounts	1,807	$ 1,738
Trade receivables | Credit risk
Credit risk exposure
Total financial assets	8,648
Trade receivables | Credit risk | Due
Credit risk exposure
Total financial assets	1,807
Trade receivables | Credit risk | Not due
Credit risk exposure
Total financial assets	6,841
Other receivables | Credit risk
Credit risk exposure
Total financial assets	455
Other receivables | Credit risk | Not due
Credit risk exposure
Total financial assets	$ 455

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- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

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The maximum holding period for deposits made with leading high-credit-quality banking and financial institutions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of overdue balances not covered by the allowance for doubtful accounts.

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