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Post employment benefits - Schedule of charge before taxation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation £ (31) £ (29) £ (87)
United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation 15 (27) (46)
Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation 1 45 4
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation (32) (31) (28)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation £ (15) £ (16) £ (17)