Contingent liabilities and legal proceedings - USL’s dispute with IDBI Bank Limited (Details) ₨ in Millions, $ in Millions |
Apr. 01, 2015
USD ($)
|
Apr. 01, 2015
INR (₨)
|
Dec. 31, 2025
USD ($)
|
Jun. 30, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
Jun. 30, 2024
USD ($)
|
|---|---|---|---|---|---|---|
| Disclosure of contingent liabilities [line items] | ||||||
| Borrowings | $ 21,672 | $ 21,854 | $ 20,676 | $ 21,017 | ||
| IDBI Bank Limited | United Spirits Limited | ||||||
| Disclosure of contingent liabilities [line items] | ||||||
| Damages claimed | $ 5 | ₨ 459 |