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Net borrowings - Schedule of net borrowings (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Borrowings [abstract]        
Borrowings due within one year and bank overdrafts £ (1,184) £ (1,862) £ (1,214)  
Borrowings due after one year (12,693) (12,865) (14,063)  
Fair value of foreign currency forwards and swaps 122 169 117  
Fair value of interest rate hedging instruments 4 63 146  
Lease liabilities (360) (363) (410)  
Gross borrowings (14,111) (14,858) (15,424)  
Cash and cash equivalents 1,780 2,749 2,763  
Net borrowings £ (12,331) £ (12,109) £ (12,661) £ (13,246)