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Net borrowings - Net borrowings by currency (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents £ 1,439 £ 2,285 £ 2,749
Gross borrowings (16,980) (16,422)  
US dollar      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 542 1,315  
Gross borrowings (5,751) (3,260)  
Euro      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 48 61  
Gross borrowings (3,864) (2,943)  
Cash and cash equivalents in cash-pooling arrangements 21    
Sterling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 46 67  
Gross borrowings (6,227) (9,214)  
Indian rupee      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 123 26  
Gross borrowings (31) (74)  
Mexican peso      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 25 14  
Gross borrowings (286) (264)  
Hungarian forint      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 3 2  
Gross borrowings (261) (214)  
Kenyan shilling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 28 53  
Gross borrowings (253) (254)  
Chinese yuan      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 199 290  
Gross borrowings (63) (75)  
Nigerian naira      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 83 133  
Gross borrowings 0 0  
Other      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 342 324  
Gross borrowings £ (244) (124)  
Turkish lira and Euro      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents in cash-pooling arrangements   £ 23