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Acquisition and sale of businesses and purchase of non-controlling interests - Prior year acquisitions (Details)
£ in Millions, $ in Millions
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
GBP (£)
May 02, 2018
Aug. 15, 2017
GBP (£)
Aug. 15, 2017
USD ($)
Disclosure of detailed information about business combination [line items]            
Consideration payable £ 69 £ 21 £ 739      
Deferred/contingent consideration payable £ 42 £ 15 £ 184      
Casamigos acquisition            
Disclosure of detailed information about business combination [line items]            
Percentage of interest acquired         100.00% 100.00%
Consideration payable         £ 777 $ 1,000
Deferred/contingent consideration payable         £ 233 $ 300
Pierde Almas Acquisition            
Disclosure of detailed information about business combination [line items]            
Percentage of intellectual property acquired       100.00%