Other equity - Summary of Other Components of Equity (Detail) ₨ in Millions, $ in Millions |
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2025
USD ($)
|
Mar. 31, 2024
INR (₨)
|
Mar. 31, 2023
INR (₨)
|
|---|---|---|---|---|
| Disclosure Of Detailed Information About Other Equity Interest Of Equity [line Items] | ||||
| Other equity interest | ₨ 7,345 | $ 86 | ₨ 2,689 | |
| Other equity interest | ||||
| Disclosure Of Detailed Information About Other Equity Interest Of Equity [line Items] | ||||
| Other equity interest | ₨ 7,345 | $ 88 | ₨ 2,689 | ₨ 1,518 |