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Significant accounting policies - Cost of Increase of Share in Controlled Companies (Details) - ARS ($) $ in Millions			1 Months Ended	12 Months Ended
		Mar. 31, 2017	Apr. 30, 2017	Dec. 31, 2017
Business combination
Increase (decrease) through changes in ownership interests	[1]			$ (3)
Personal
Business combination
Number of Shares Acquired		120,000
Proportion of voting rights held by non-controlling interests		0.008%
Total purchase price			$ 4
Ownership percentage by parent			100.00%
Increase (decrease) through changes in ownership interests				$ 3
[1] See Note 3.u.

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- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The increase (decrease) in equity attributable to owners of the parent through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]; Equity attributable to owners of parent]

+ References

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

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-IssueDate 2017-01-01
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