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Post employment benefits - Weighted average assumptions used to determine group's deficit/surplus in main post employment plans (Details)
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
United Kingdom      
Disclosure of defined benefit plans [line items]      
Rate of general increase in salaries 3.60% 3.40% 3.20%
Rate of increase to pensions in payment 2.90% 3.10% 3.00%
Rate of increase to deferred pensions 2.60% 2.50% 2.10%
Discount rate for plan liabilities 3.80% 1.90% 1.50%
United Kingdom | CPI      
Disclosure of defined benefit plans [line items]      
Inflation 2.60% 2.50% 2.10%
United Kingdom | RPI      
Disclosure of defined benefit plans [line items]      
Inflation 3.10% 3.00% 2.80%
Ireland      
Disclosure of defined benefit plans [line items]      
Rate of general increase in salaries 3.80% 3.00% 2.60%
Rate of increase to pensions in payment 2.20% 1.70% 1.40%
Rate of increase to deferred pensions 2.30% 1.60% 1.20%
Discount rate for plan liabilities 3.20% 1.00% 1.20%
Ireland | CPI      
Disclosure of defined benefit plans [line items]      
Inflation 2.40% 1.60% 1.20%
United States      
Disclosure of defined benefit plans [line items]      
Rate of general increase in salaries 0.00% 0.00% 0.00%
Rate of increase to pensions in payment 0.00% 0.00% 0.00%
Rate of increase to deferred pensions 0.00% 0.00% 0.00%
Discount rate for plan liabilities 4.40% 2.70% 2.60%
United States | CPI      
Disclosure of defined benefit plans [line items]      
Inflation 2.30% 2.30% 1.40%