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Finance income and charges - Contribution of the Group's Venezuelan operations (Details)
£ in Millions
 6 Months Ended
Dec. 31, 2022
GBP (£)
Bs. / £
Dec. 31, 2021
GBP (£)
Bs. / £
Jun. 30, 2022
GBP (£)
Disclosure of geographical areas [line items]      
Net sales £ 9,420 £ 7,957  
Operating profit 3,161 2,743  
Net cash outflow from operating activities 1,248 1,947  
Net assets 9,866 9,331 £ 9,514
Venezuela      
Disclosure of geographical areas [line items]      
Net sales 0 0  
Operating profit 0 0  
Other finance income - hyperinflation adjustment 0 1  
Net cash outflow from operating activities 0 0  
Net assets 20 37  
Venezuela | Reported if in compliance with requirement of IFRS      
Disclosure of geographical areas [line items]      
Net sales 7 8  
Operating profit 2 2  
Other finance income - hyperinflation adjustment 0 120  
Net cash outflow from operating activities (1) (3)  
Net assets £ 1,467 £ 3,501  
Venezuelan Bolivar Soberano | Venezuela      
Disclosure of geographical areas [line items]      
Closing foreign exchange rate | Bs. / £ 1,540 593  
Venezuelan Bolivar Soberano | Venezuela | Reported if in compliance with requirement of IFRS      
Disclosure of geographical areas [line items]      
Closing foreign exchange rate | Bs. / £ 21 6