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Intangible assets - Schedule of Goodwill attributed to cash-generating units (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit £ 2,287 £ 1,957
North America    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 773 609
Turkey    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 255 143
Greater China    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 141 128
India    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 747 693
Latin America and Caribbean – Mexico    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 142 126
Other cash-generating units    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit £ 229 £ 258