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Contingent liabilities and legal proceedings - Acquisition of USL shares from UBHL, winding-up petitions against UHBL and other proceedings in relation to USL transaction (Details)
₨ / shares in Units, £ in Millions, $ in Millions, ₨ in Billions
 2 Months Ended 4 Months Ended 12 Months Ended
Jun. 30, 2021
GBP (£)
Dec. 31, 2020
shares
Feb. 25, 2016
GBP (£)
Feb. 25, 2016
USD ($)
Jul. 04, 2013
GBP (£)
₨ / shares
shares
Nov. 09, 2012
Petition
Aug. 31, 2019
Jun. 30, 2020
GBP (£)
Jun. 30, 2021
GBP (£)
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
GBP (£)
Jul. 04, 2013
INR (₨)
Disclosure of contingent liabilities [line items]                        
Total consideration | £ £ 613             £ 69 £ 613 £ 69 £ 21  
Proportion of ownership interest in subsidiary                 100.00%      
USL Benefit Trust                        
Disclosure of contingent liabilities [line items]                        
Proportion of ownership interest in subsidiary                 2.38%      
SPA | UBHL                        
Disclosure of contingent liabilities [line items]                        
Number of pending wnding-up petitions | Petition           5            
25 February agreement | Dr Mallya                        
Disclosure of contingent liabilities [line items]                        
Payment relating to disengagement agreements     £ 53 $ 75                
United Spirits Limited                        
Disclosure of contingent liabilities [line items]                        
Percentage of interest acquired         14.98%             14.98%
Proportion of ownership interest in subsidiary 55.94%           54.78% 55.94% 55.94%      
United Spirits Limited | USL Benefit Trust                        
Disclosure of contingent liabilities [line items]                        
Proportion of ownership interest in subsidiary                   2.38%    
Ownership interest in associate 2.38%                      
United Spirits Limited | UBHL                        
Disclosure of contingent liabilities [line items]                        
Percentage of interest acquired         6.98%             6.98%
Acquisition price per share (in INR per share) | ₨ / shares         ₨ 1,440              
United Spirits Limited | SPA                        
Disclosure of contingent liabilities [line items]                        
Business acquisition number of shares acquired         21,767,749              
Total consideration         ₨ 349             ₨ 31.3
United Spirits Limited | SPA | UBHL                        
Disclosure of contingent liabilities [line items]                        
Business acquisition number of shares acquired   50,707,185     10,141,437