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Net borrowings - Schedule of net borrowings (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Borrowings [abstract]        
Borrowings due within one year and bank overdrafts £ (2,305) £ (1,522) £ (1,184)  
Borrowings due after one year (15,304) (14,498) (12,693)  
Fair value of foreign currency forwards and swaps 534 356 122  
Fair value of interest rate hedging instruments (422) (283) 4  
Lease liabilities (438) (475) (360)  
Gross borrowings (17,935) (16,422) (14,111)  
Cash and cash equivalents 2,766 2,285 1,780  
Net borrowings £ (15,169) £ (14,137) £ (12,331) £ (12,109)