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Taxation (Details) - GBP (£)
£ in Millions
 6 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Disclosure of geographical areas [line items]      
Tax charge £ 650 £ 634  
Current tax assets 166 151 £ 149
Current tax liabilities 266 £ 380 252
Provision for tax uncertainties £ 169   £ 156
The tax rate before exceptional items 23.40% 23.00%  
US MAP      
Disclosure of geographical areas [line items]      
Tax charge £ (57)    
Total exceptional items      
Disclosure of geographical areas [line items]      
Tax charge (70) £ 0  
Great Britain      
Disclosure of geographical areas [line items]      
Tax charge 122 116  
Foreign      
Disclosure of geographical areas [line items]      
Tax charge £ 528 £ 518