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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, 2021
Jun. 30, 2020
Jun. 30, 2019
United Kingdom | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.2 86.4 86.2
United Kingdom | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.7 88.7 88.5
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 88.6 88.5 88.3
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 90.8 90.8 90.6
Ireland | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 86.9 86.6 86.5
Ireland | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 89.3 89.3 89.2
Ireland | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.6 89.6 89.5
Ireland | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 91.1 92.3 92.2
United States | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 85.4 85.6 85.7
United States | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.1 87.3 87.7
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 86.9 87.2 87.3
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 88.5 88.9 89.3