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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, 2025
Jun. 30, 2024
Jun. 30, 2023
United Kingdom      
Disclosure of defined benefit plans [line items]      
Rate of general increase in salaries 3.30% 3.60% 3.70%
Rate of increase to pensions in payment 2.50% 2.80% 2.90%
Rate of increase to deferred pensions 2.30% 2.60% 2.70%
Discount rate for plan liabilities 5.60% 5.10% 5.20%
United Kingdom | CPI      
Disclosure of defined benefit plans [line items]      
Inflation 2.30% 2.60% 2.70%
United Kingdom | RPI      
Disclosure of defined benefit plans [line items]      
Inflation 2.80% 3.10% 3.20%
Ireland      
Disclosure of defined benefit plans [line items]      
Rate of general increase in salaries 3.40% 3.70% 3.90%
Rate of increase to pensions in payment 2.00% 2.20% 2.30%
Rate of increase to deferred pensions 2.00% 2.20% 2.40%
Discount rate for plan liabilities 3.80% 3.60% 3.60%
Ireland | CPI      
Disclosure of defined benefit plans [line items]      
Inflation 2.00% 2.30% 2.50%
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 5.20% 5.30% 4.90%
United States | CPI      
Disclosure of defined benefit plans [line items]      
Inflation 2.30% 2.30% 2.20%