Earnings Per Equity Share - Summary of Basic Earnings Per Share (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions	12 Months Ended
Mar. 31, 2025 INR (₨) ₨ / shares shares	Mar. 31, 2025 USD ($) shares	Mar. 31, 2024 INR (₨) ₨ / shares shares	Mar. 31, 2023 INR (₨) ₨ / shares shares
Earnings per share [abstract]
Profit attributable to equity holders of the Company	₨ 131,354	$ 1,537	₨ 110,452	₨ 113,500
Weighted average number of equity shares outstanding \| shares	10,456,741,552	10,456,741,552	10,576,571,110	10,954,933,146
Basic earnings per equity share \| ₨ / shares	₨ 12.56		₨ 10.44	₨ 10.36

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2024-01-01
-Paragraph 70
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2024-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2024-03-27

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