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Acquisition and sale of businesses and purchase of non-controlling interests - Prior year acquisitions (Detail)
£ in Millions, $ in Millions
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
GBP (£)
May 02, 2018
Aug. 15, 2017
GBP (£)
Aug. 15, 2017
USD ($)
Jun. 30, 2017
GBP (£)
Disclosure of detailed information about business combination [line items]            
Consideration payable £ 21 £ 739       £ 0
Deferred/contingent consideration payable £ 15 £ 184       £ 0
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 costs     100.00%