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Net borrowings - Net borrowings by currency (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents £ 2,285 £ 2,749 £ 3,323
Gross borrowings (16,422) (14,858)  
US dollar      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 1,315 1,890  
Gross borrowings (3,260) (4,001)  
Euro      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 61 82  
Gross borrowings (2,943) (2,841)  
Sterling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 67 38  
Gross borrowings (9,214) (7,279)  
Indian rupee      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 26 26  
Gross borrowings (74) (109)  
Mexican peso      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 14 9  
Gross borrowings (264) (102)  
Kenyan shilling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 53 16  
Gross borrowings (254) (293)  
Hungarian forint      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 2 3  
Gross borrowings (214) (241)  
Chinese yuan      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 290 255  
Gross borrowings (75) (20)  
Nigerian naira      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 133 60  
Gross borrowings 0 (1)  
Other      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 324 370  
Gross borrowings (124) 29  
Turkish lira and Euro      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents in cash-pooling arrangements £ 23    
Turkish lira      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents in cash-pooling arrangements   £ 31