Segment information - Summary of Operating Segments (Parenthetical) (Detail) ₨ in Millions, $ in Millions	12 Months Ended
Mar. 31, 2025 INR (₨)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 INR (₨)	Mar. 31, 2023 INR (₨)
Disclosure of operating segments [line items]
Revenue	₨ 97,063	$ 1,136	₨ 81,319	₨ 78,223
Loss on account of modification of contractual cash flows	0		19	1,277
Reportable segments
Disclosure of operating segments [line items]
Revenue	₨ 120,831		₨ 96,406	₨ 78,134

The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details