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Intangibles - Estimated useful lives (Details)	12 Months Ended
	Dec. 31, 2020
Software
Estimated useful lives of intangibles
Useful life	5 years
Minimum | Railways concessions
Estimated useful lives of intangibles
Useful life	3 years
Minimum | Contract right
Estimated useful lives of intangibles
Useful life	22 years
Maximum | Railways concessions
Estimated useful lives of intangibles
Useful life	50 years
Maximum | Contract right
Estimated useful lives of intangibles
Useful life	31 years

X

- Definition

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.

+ References

No definition available.

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X

- Definition

The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph a
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-URIDate 2020-01-01

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