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Post employment benefits - Expected age at death of an average worker who retires currently at age 65, one who is currently aged 45 and subsequently retires at the age of 65 (Details) - yr
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
United Kingdom | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 86.8 87.1 87.2
United Kingdom | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.4 88.7 88.7
United Kingdom | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.1 88.5 88.6
United Kingdom | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 90.4 90.7 90.8
Ireland | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.2 87.7 86.9
Ireland | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 89.6 90.0 89.3
Ireland | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.8 89.3 88.6
Ireland | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 91.3 91.7 91.1
United States | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 85.6 85.5 85.4
United States | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.2 87.2 87.1
United States | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.1 87.0 86.9
United States | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.7 88.6 88.5