Intangible assets (Details) - INR (₨) ₨ in Millions	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disclosure Of Intangible Assets And Goodwill Explanatory [Abstract]
Other intangible assets	₨ 601	₨ 696	₨ 641
Intangible assets and goodwill	₨ 601	₨ 696

The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_IntangibleAssetsAndGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant