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Contingent liabilities and legal proceedings - Other continuing matters relating to Dr Mallya and affiliates (Details)
$ in Millions
 12 Months Ended
Oct. 15, 2020
USD ($)
Oct. 15, 2020
GBP (£)
May 24, 2019
USD ($)
May 24, 2019
GBP (£)
May 23, 2019
Nov. 16, 2017
USD ($)
Nov. 16, 2017
GBP (£)
Jul. 04, 2013
USD ($)
Jul. 04, 2013
GBP (£)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
GBP (£)
Watson Limited                      
Disclosure of contingent liabilities [line items]                      
Damages awarded     $ 135.0 £ 100,000,000              
Interest on damages awarded     11.0 8,000,000              
CASL                      
Disclosure of contingent liabilities [line items]                      
Damages awarded     67.5 50,000,000              
Interest on damages awarded     $ 5.5 £ 4,000,000              
Damages awarded, co-surety percentage         50.00%            
Watson Limited And Continental Administration Services Limited (CASL)                      
Disclosure of contingent liabilities [line items]                      
Damages awarded   £ 260,000                  
Additional damages awarded $ 6.0 £ 4,000,000                  
Contingent liability for guarantees | Standard Chartered Bank (SCB) | Watson Limited | Diageo Holdings Netherlands BV                      
Disclosure of contingent liabilities [line items]                      
Guarantee provided in respect of bank facilities               $ 135.0 £ 100,000,000    
Payment under guarantee agreement           $ 141.0 £ 104,000,000     $ 141.0 £ 101,000,000
Damages claimed           141.0 101,000,000        
25 February agreement | Watson Limited                      
Disclosure of contingent liabilities [line items]                      
Damages claimed           $ 142.0 £ 105,000,000        
Percentage of damages claimed           50.00% 50.00%