Lease liabilities - Summary of Lease Liabilities (Detail) ₨ in Millions, $ in Millions |
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2025
USD ($)
|
Mar. 31, 2024
INR (₨)
|
Mar. 31, 2023
INR (₨)
|
|---|---|---|---|---|
| Presentation of leases for lessee [abstract] | ||||
| Non-current lease liabilities | ₨ 8,282 | $ 97 | ₨ 7,477 | ₨ 5,471 |
| Current lease liabilities | ₨ 977 | $ 11 | ₨ 868 | ₨ 698 |