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Contingent liabilities and legal proceedings - USL's dispute with IDBI Bank Limited (Details) ₨ in Millions, £ in Millions			12 Months Ended
	Apr. 01, 2015 GBP (£)	Apr. 01, 2015 INR (₨)	Jun. 30, 2021 GBP (£)	Jun. 30, 2021 INR (₨)	Jun. 30, 2020 GBP (£)	Jun. 30, 2019 GBP (£)	Jul. 03, 2013 GBP (£)	Jul. 03, 2013 INR (₨)
Disclosure of contingent liabilities [line items]
Borrowings			£ 12,109		£ 13,246	£ 11,277
IDBI Bank Limited | United Spirits Limited
Disclosure of contingent liabilities [line items]
Damages claimed	£ 4	₨ 459	£ 4	₨ 459
IDBI Bank Limited | IDBI Term loan | United Spirits Limited
Disclosure of contingent liabilities [line items]
Borrowings							£ 61	₨ 6,280

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
-Paragraph 55
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