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Post employment benefits - Plan assets and liabilities by type of post employment benefit and country (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country $ 721 $ 748 $ 1,410
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 8,417 8,624 10,163
Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (7,696) (7,876) $ (8,753)
Pensions | Plan assets | United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 5,654 5,771  
Pensions | Plan assets | Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 1,954 1,999  
Pensions | Plan assets | United States      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 569 555  
Pensions | Plan assets | Other      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 216 227  
Pensions | Plan liabilities | United Kingdom      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (5,028) (5,094)  
Pensions | Plan liabilities | Ireland      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (1,595) (1,650)  
Pensions | Plan liabilities | United States      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (534) (516)  
Pensions | Plan liabilities | Other      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (241) (244)  
Post-employment medical | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 3 3  
Post-employment medical | Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country (266) (288)  
Other post-employment | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country 21 69  
Other post-employment | Plan liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Plan asset and liabilities by type and country $ (32) $ (84)