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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country £ 447 £ 365 £ 215
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 9,892 10,422 9,713
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (9,445) (10,057) £ (9,498)
Pensions | Plan assets | United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 7,341 7,696  
Pensions | Plan assets | Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 1,826 1,810  
Pensions | Plan assets | United States      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 470 660  
Pensions | Plan assets | Other      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 186 183  
Pensions | Plan liabilities | United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (6,580) (6,831)  
Pensions | Plan liabilities | Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (1,926) (2,031)  
Pensions | Plan liabilities | United States      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (373) (578)  
Pensions | Plan liabilities | Other      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (225) (240)  
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 (262) (288)  
Other post employment | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 67 71  
Other post employment | Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country £ (79) £ (89)