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Financial instruments - Fair values and risk management - Sensitivity analysis (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Interest rate risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible increase in risk assumption 1.00%    
Percentage of reasonably possible decrease in risk assumption 1.00%    
Changes in equity due to increase in risk component € 0 € 0 € 0
Foreign currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of Reasonably Possible Increase (decrease) in Risk Assumption 10.00%    
Percentage of reasonably possible increase in risk assumption 10.00%    
Percentage of reasonably possible decrease in risk assumption 10.00%    
Changes in profit loss due to increase in risk component € (38) (2) (33)
Changes in profit loss due to decrease in risk component 46 26 40
Changes in equity due to increase in risk component (554) (588) (372)
Changes in equity due to decrease in risk component € 677 695 € 304
Jet fuel risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of Reasonably Possible Increase (decrease) in Risk Assumption 10.00%    
Percentage of reasonably possible increase in risk assumption 10.00%    
Percentage of reasonably possible decrease in risk assumption 10.00%    
Changes in profit loss due to increase in risk component € 4 47  
Changes in profit loss due to decrease in risk component (7) (40)  
Changes in equity due to increase in risk component 258 234  
Changes in equity due to decrease in risk component € (258) € (234)