v3.26.1
Post employment benefits - Sensitivity analysis (Details)
€ in Millions
 12 Months Ended
Mar. 31, 2026
EUR (€)
Life expectancy  
Sensitivity analysis  
Increase in actuarial assumption life expectancy (in Years) 1 year
Decrease in actuarial assumption life expectancy (in Years) 1 year
Defined Benefit Pension Plan | Rate of inflation  
Sensitivity analysis  
Decrease in actuarial assumption (as a percent) 0.50%
Increase in actuarial assumption (as a percent) 0.50%
Decrease in actuarial assumption € (158) [1]
Increase in actuarial assumption € 169 [1]
Defined Benefit Pension Plan | Rate of increase in salaries  
Sensitivity analysis  
Decrease in actuarial assumption (as a percent) 0.50%
Increase in actuarial assumption (as a percent) 0.50%
Decrease in actuarial assumption € (2) [1]
Increase in actuarial assumption € 2 [1]
Defined Benefit Pension Plan | Discount rate  
Sensitivity analysis  
Decrease in actuarial assumption (as a percent) 0.50%
Increase in actuarial assumption (as a percent) 0.50%
Decrease in actuarial assumption € 253 [1]
Increase in actuarial assumption (229) [1]
Defined Benefit Pension Plan | Life expectancy  
Sensitivity analysis  
Decrease in actuarial assumption (119) [1]
Increase in actuarial assumption € 117 [1]
[1] The sensitivity analysis may not be representative of an actual change in the defined benefit obligation as it is unlikely that changes in assumptions would occur in isolation of one another. In presenting this sensitivity analysis, the change in the present value of the defined benefit obligation has been calculated on the same basis as prior years using the projected unit credit method at the end of the year, which is the same as that applied in calculating the defined benefit obligation liability recognised in the statement of financial position. The rate of inflation assumption sensitivity factors in the impact of changes to all assumptions relating to inflation including the rate of increase in salaries, pension increases and deferred revaluations.