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Contingent liabilities and legal proceedings - USL’s dispute with IDBI Bank Limited (Details) ₨ in Millions, $ in Millions | Apr. 01, 2015 USD ($) | Apr. 01, 2015 INR (₨) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Jul. 03, 2013 USD ($) | Jul. 03, 2013 INR (₨)
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Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Borrowings |  |  | $ 20,483 | $ 19,582 | $ 18,203 | $ 17,107 |  |
IDBI Bank Limited | United Spirits Limited |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Damages claimed | $ 6 | ₨ 459 |  |  |  |  |  |
IDBI Bank Limited | IDBI term loan | United Spirits Limited |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | $ 76 | ₨ 6,280

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