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Net borrowings - Maturity of gross borrowings before derivative financial instruments (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments £ 16,502 £ 16,020
Within one year    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 1,701 1,522
Between one and three years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 3,522 2,817
Between three and five years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 2,874 2,625
Beyond five years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments £ 8,405 £ 9,056