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Post employment benefits - Timing of benefit payments and average duration of defined benefit obligations and distribution of timing of benefit payments (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 0 $ 0
United Kingdom    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 10,985 $ 11,012
Average duration of the defined benefit obligation 14 years 14 years
United Kingdom | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 311 $ 382
United Kingdom | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 1,225 1,373
United Kingdom | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 3,123 3,073
United Kingdom | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,948 2,827
United Kingdom | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 3,378 3,357
Ireland    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 2,963 $ 3,224
Average duration of the defined benefit obligation 14 years 14 years
Ireland | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 88 $ 92
Ireland | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 441 462
Ireland | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 870 916
Ireland | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 748 813
Ireland | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 816 941
United States    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 1,263 $ 1,204
Average duration of the defined benefit obligation 9 years 9 years
United States | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 64 $ 72
United States | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 216 219
United States | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 456 417
United States | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 297 260
United States | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid $ 230 $ 236