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Post employment benefits - Plan assets and liabilities by type of post employment benefit and country (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country £ 1,165 £ 447 £ 365
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 8,399 9,892 10,422
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (7,234) (9,445) £ (10,057)
Pensions | Plan assets | United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 6,041 7,341  
Pensions | Plan assets | Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 1,645 1,826  
Pensions | Plan assets | United States      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 453 470  
Pensions | Plan assets | Other      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 191 186  
Pensions | Plan liabilities | United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (4,897) (6,580)  
Pensions | Plan liabilities | Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (1,409) (1,926)  
Pensions | Plan liabilities | United States      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (408) (373)  
Pensions | Plan liabilities | Other      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (212) (225)  
Post employment medical | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 2 2  
Post employment medical | Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (225) (262)  
Other post employment | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 67 67  
Other post employment | Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country £ (83) £ (79)