Cash and bank balances - Summary Of Bank Balances Other Than Cash And Cash Equivalents Explanatory (Detail) ₨ in Millions, $ in Millions |
Mar. 31, 2026
INR (₨)
|
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025
INR (₨)
|
|---|---|---|---|
| Bank Balances Other Than Cash And Cash Equivalents [Abstract] | |||
| Less: amount disclosed under other financial assets (others) (refer Note 11) | ₨ (3,791) | $ (40) | ₨ (2,433) |
| Balances with banks | 46,706 | 498 | 40,099 |
| Gross carrying amount | |||
| Bank Balances Other Than Cash And Cash Equivalents [Abstract] | |||
| Balances with banks | 50,497 | 538 | 42,532 |
| Not later than one year | |||
| Bank Balances Other Than Cash And Cash Equivalents [Abstract] | |||
| Balances with banks | 46,706 | 498 | 40,099 |
| Later than one year | |||
| Bank Balances Other Than Cash And Cash Equivalents [Abstract] | |||
| Balances with banks | ₨ 3,791 | $ 40 | ₨ 2,433 |