Hedging activities and derivatives - Summary Of Foreign Currency And Interest Rate Risk (Detail) - Hedge Instruments [Member] - INR (₨) ₨ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Disclosure of detailed information about hedging instruments [line items] | ||
| Derivative contracts designated as hedging instruments - Non-current Asset | ₨ 3,309 | ₨ 2,593 |
| Derivative contracts designated as hedging instruments - Current Asset | 4,089 | 973 |
| Derivative contracts designated as hedging instruments - Non-current Liabilities | 217 | 225 |
| Derivative contracts designated as hedging instruments - Current Liabilities | ₨ 830 | ₨ 1,093 |