Other operating income - Summary of Other Operating Income (Detail) ₨ in Millions, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
|
Mar. 31, 2026
INR (₨)
|
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2024
INR (₨)
|
|
| Schedule Of Other Operating Income [Abstract] | ||||
| Income from sale of emission reduction certificates | ₨ 963 | $ 10 | ₨ 424 | ₨ 580 |
| Others | 35 | 0 | 26 | 49 |
| Total | ₨ 998 | $ 11 | ₨ 450 | ₨ 629 |