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Post employment benefits - Sensitivity analyses of potential impacts on consolidated income statement and on plan liabilities (Details)
£ in Millions
 12 Months Ended
Jun. 30, 2023
GBP (£)
yr
Jun. 30, 2022
GBP (£)
Jun. 30, 2021
GBP (£)
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit £ 4,632 £ 4,409 £ 3,731
Profit for the year £ 3,766 £ 3,338 £ 2,799
Discount rate      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Percentage of reasonably possible increase in actuarial assumption 0.50%    
Percentage of reasonably possible decrease in actuarial assumption 0.50%    
Inflation      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Percentage of reasonably possible increase in actuarial assumption 0.50%    
Percentage of reasonably possible decrease in actuarial assumption 0.50%    
Life expectancy      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Duration of reasonably possible increase in actuarial assumption | yr 1    
United Kingdom | Effect of 0.5% increase in discount rate      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit £ 2    
Profit for the year 15    
Plan liabilities 259    
United Kingdom | Effect of 0.5% decrease in discount rate      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit (2)    
Profit for the year (14)    
Plan liabilities (267)    
United Kingdom | Effect of 0.5% increase in inflation      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit (1)    
Profit for the year (8)    
Plan liabilities (156)    
United Kingdom | Effect of 0.5% decrease in inflation      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 2    
Profit for the year 8    
Plan liabilities 173    
United Kingdom | Effect of one year increase in life expectancy      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 0    
Profit for the year (6)    
Plan liabilities (131)    
Ireland | Effect of 0.5% increase in discount rate      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 1    
Profit for the year 5    
Plan liabilities 85    
Ireland | Effect of 0.5% decrease in discount rate      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit (1)    
Profit for the year (4)    
Plan liabilities (95)    
Ireland | Effect of 0.5% increase in inflation      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 0    
Profit for the year (2)    
Plan liabilities (49)    
Ireland | Effect of 0.5% decrease in inflation      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 0    
Profit for the year 2    
Plan liabilities 50    
Ireland | Effect of one year increase in life expectancy      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 0    
Profit for the year (2)    
Plan liabilities (55)    
United States | Effect of 0.5% increase in discount rate      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 2    
Profit for the year 2    
Plan liabilities 22    
United States | Effect of 0.5% decrease in discount rate      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit (2)    
Profit for the year (2)    
Plan liabilities (24)    
United States | Effect of 0.5% increase in inflation      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 0    
Profit for the year (1)    
Plan liabilities (9)    
United States | Effect of 0.5% decrease in inflation      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 0    
Profit for the year 1    
Plan liabilities 8    
United States | Effect of one year increase in life expectancy      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Operating profit 0    
Profit for the year (1)    
Plan liabilities £ (15)