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Post employment benefits - Movement in net surplus (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]      
Beginning Balance £ 447 £ 365  
Exchange differences (7) 31  
Charge before taxation (29) (87) £ (38)
Other comprehensive (loss)/income 626 16 40
Contributions by the group 128 122  
Settlements paid 0 0  
Employee contributions 0 0  
Benefits paid 0 0  
Ending Balance 1,165 447 365
Net settlement gain (27) 14  
Past service cost, net defined benefit liability (asset) (34) 0 (50)
Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Charge before taxation 45 4 34
Benefits paid 2,529 2,412  
Past service cost, net defined benefit liability (asset) (28) (47)  
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance 9,892 10,422  
Exchange differences 93 (214)  
Charge before taxation 176 149  
Other comprehensive (loss)/income (1,432) (6)  
Contributions by the group 128 122  
Settlements paid 52 169  
Employee contributions 5 4  
Benefits paid (411) (416)  
Ending Balance 8,399 9,892 10,422
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance (9,445) (10,057)  
Exchange differences (100) 245  
Charge before taxation (205) (236)  
Other comprehensive (loss)/income 2,058 22  
Contributions by the group 0 0  
Settlements paid (52) (169)  
Employee contributions (5) (4)  
Benefits paid 411 416  
Ending Balance (7,234) (9,445) £ (10,057)
ETV      
Disclosure of net defined benefit liability (asset) [line items]      
Settlements paid £ 52    
US Cash Balance Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Settlements paid   £ 151