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Post employment benefits - Movement in net (deficit)/surplus (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]      
Beginning Balance £ 365 £ 215  
Exchange differences 31 (8)  
Charge before taxation (87) (38) £ (64)
Other comprehensive (loss)/income 16 40 31
Contributions by the group 122 156  
Settlements paid 0    
Employee contributions 0 0  
Benefits paid 0 0  
Ending Balance 447 365 215
Net settlement gain 14    
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance 10,422 9,713  
Exchange differences (214) 65  
Charge before taxation 149 198  
Other comprehensive (loss)/income (6) 774  
Contributions by the group 122 156  
Settlements paid (169)    
Employee contributions 4 5  
Benefits paid (416) (489)  
Ending Balance 9,892 10,422 9,713
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance (10,057) (9,498)  
Exchange differences 245 (73)  
Charge before taxation (236) (236)  
Other comprehensive (loss)/income 22 (734)  
Contributions by the group 0 0  
Settlements paid 169    
Employee contributions (4) (5)  
Benefits paid 416 489  
Ending Balance (9,445) £ (10,057) £ (9,498)
US Cash Balance Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Settlements paid £ 151