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Net borrowings - Net borrowings by currency (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents £ 2,749 £ 3,323 £ 932
Gross borrowings (14,858) (16,569)  
US dollar      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 1,890 2,649  
Gross borrowings (4,001) (6,300)  
Euro      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 82 57  
Gross borrowings (2,841) (3,119)  
Sterling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 38 19  
Gross borrowings (7,279) (6,233)  
Indian rupee      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 26 13  
Gross borrowings (109) (253)  
Kenyan shilling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 16 28  
Gross borrowings (293) (351)  
Hungarian forint      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 3 3  
Gross borrowings (241) (239)  
Mexican peso      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 9 16  
Gross borrowings (102) (104)  
Chinese yuan      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 255 207  
Gross borrowings (20) (1)  
Nigerian naira      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 60 6  
Gross borrowings (1) (15)  
Other      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 370 325  
Gross borrowings 29 46  
Turkish lira      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents in cash-pooling arrangements £ 31 £ 100