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Net borrowings - Maturity of gross borrowings before derivative financial instruments (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments £ 14,727 £ 16,785
Within one year    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 1,862 1,995
Between one and three years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 2,623 3,013
Between three and five years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 2,788 3,134
Beyond five years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments £ 7,454 £ 8,643