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Contingent liabilities and legal proceedings - USL’s dispute with IDBI Bank Limited (Details) ₨ in Millions, £ in Millions | Apr. 01, 2015 GBP (£) | Apr. 01, 2015 INR (₨) | Dec. 31, 2022 GBP (£) | Jun. 30, 2022 GBP (£) | Dec. 31, 2021 GBP (£) | Jun. 30, 2021 GBP (£) | Jul. 03, 2013 GBP (£) | Jul. 03, 2013 INR (₨)
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Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Borrowings |  |  | £ 15,169 | £ 14,137 | £ 12,331 | £ 12,109 |  |
IDBI Bank Limited | United Spirits Limited |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Damages claimed | £ 5 | ₨ 459 |  |  |  |  |  |
IDBI Bank Limited | IDBI term loan | United Spirits Limited |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | £ 63 | ₨ 6,280

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