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Post employment benefits - Schedule of charge before taxation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation £ (29) £ (87) £ (38)
United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation (27) (46) (23)
Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation 45 4 34
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation (31) (28) (30)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation £ (16) £ (17) £ (19)