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Intangible assets - Schedule of Goodwill attributed to cash-generating units (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit £ 2,227 £ 2,287
United States    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 767 773
Turkey    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 216 255
Greater China    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 124 141
India    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 673 747
Mexico    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit 161 142
Other cash-generating units    
Disclosure of information for cash-generating units [line items]    
Goodwill attributed to cash-generating unit £ 286 £ 229