Loans, borrowings and bank overdrafts - Summary of Current and Non-Current Borrowings (Parenthetical) (Details) ₨ in Millions, $ in Millions |
Jun. 23, 2021
USD ($)
|
Mar. 31, 2026
INR (₨)
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2024
INR (₨)
|
||
|---|---|---|---|---|---|---|
| Disclosure of detailed information about borrowings [line items] | ||||||
| Bank overdrafts | ₨ 0 | ₨ 2 | ||||
| Loans, borrowings and bank overdrafts | [1] | ₨ 167,874 | ₨ 161,817 | |||
| Unsecured Notes 2026 [member] | ||||||
| Disclosure of detailed information about borrowings [line items] | ||||||
| Loans, borrowings and bank overdrafts | $ | $ 750 | |||||
| Interest rate | 1.50% | 1.50% | ||||
| Final maturity | June 23, 2026 | |||||
| ||||||