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Post employment benefits - Movement in net surplus (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]      
Beginning Balance £ 1,165 £ 447  
Exchange differences 6 (7)  
Disposals 4    
Charge before taxation (31) (29) £ (87)
Other comprehensive (loss)/income (650) 626 16
Contributions by the group 100 128  
Settlements paid   0  
Employee contributions 0 0  
Benefits paid 0 0  
Ending Balance 594 1,165 447
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance 8,399 9,892  
Exchange differences (49) 93  
Disposals 0    
Charge before taxation 298 176  
Other comprehensive (loss)/income (1,435) (1,432)  
Contributions by the group 100 128  
Settlements paid   52  
Employee contributions 5 5  
Benefits paid (472) (411)  
Ending Balance 6,846 8,399 9,892
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning Balance (7,234) (9,445)  
Exchange differences 55 (100)  
Disposals 4    
Charge before taxation (329) (205)  
Other comprehensive (loss)/income 785 2,058  
Contributions by the group 0 0  
Settlements paid   (52)  
Employee contributions (5) (5)  
Benefits paid 472 411  
Ending Balance £ (6,252) £ (7,234) £ (9,445)