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Post employment benefits - Schedule of charge before taxation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation £ (87) £ (38) £ (64)
United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation (46) (23) (3)
Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation 4 34 (13)
United States      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation (28) (30) (30)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation £ (17) £ (19) £ (18)