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Financial instruments - Fair values and risk management - Jet fuel and carbon credits price risk (Details)
€ in Millions
12 Months Ended
Mar. 31, 2025
EUR (€)
$ / t
£ / Right
€ / Right
Mar. 31, 2024
EUR (€)
£ / Right
$ / t
€ / Right
Mar. 31, 2023
EUR (€)
$ / t
Jet fuel risk      
Disclosure of detailed information about financial instruments [line items]      
Percentage of Reasonably Possible Increase (decrease) in Risk Assumption 10.00%    
Increase (Decrease) in Profit and Loss Due to Reasonably Possible Decrease in Designated Risk Component € 0 € 0  
Percentage of Reasonably Possible Decrease in Risk Assumption 10.00%    
Increase (Decrease) in Profit and Loss Due to Reasonably Possible Increase in Designated Risk Component € 0 0  
Percentage of Reasonably Possible Increase in Risk Assumption 10.00%    
Increase (Decrease) In Equity Due To Reasonably Possible decrease In Designated Risk Component € (286) (254)  
Increase (Decrease) In Equity Due To Reasonably Possible Increase In Designated Risk Component € 286 254  
Jet fuel risk | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Hedging percentage, policy 90.00%    
Estimated percentage of jet fuel expenses covered by hedging contracts as of reporting date 77.00%    
Jet fuel risk | Cash Flow Hedges | Jet Fuel Hedges      
Disclosure of detailed information about financial instruments [line items]      
Hedge ineffectiveness charge € 0 0 € 0
Jet fuel risk | Cash Flow Hedges | Jet fuel forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Notional amount € 3,500 € 2,700 € 3,300
Average Hedged Rate Per Tonne | $ / t 761 795 885
Jet fuel risk | Minimum | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Hedging contracts, period covered 18 months    
Jet fuel risk | Maximum | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Hedging contracts, period covered 24 months    
Carbon price risk      
Disclosure of detailed information about financial instruments [line items]      
Percentage of Reasonably Possible Increase (decrease) in Risk Assumption 10.00%    
Increase (Decrease) in Profit and Loss Due to Reasonably Possible Decrease in Designated Risk Component € 0 € 0  
Percentage of Reasonably Possible Decrease in Risk Assumption 10.00%    
Increase (Decrease) in Profit and Loss Due to Reasonably Possible Increase in Designated Risk Component € 0 0  
Percentage of Reasonably Possible Increase in Risk Assumption 10.00%    
Increase (Decrease) In Equity Due To Reasonably Possible decrease In Designated Risk Component € (37) (74)  
Increase (Decrease) In Equity Due To Reasonably Possible Increase In Designated Risk Component € 37 € 72  
Carbon price risk | Cash Flow Hedges | Carbon rights contracts      
Disclosure of detailed information about financial instruments [line items]      
Estimated percentage of jet fuel expenses covered by hedging contracts as of reporting date   100.00%  
Estimated percentage of carbon emission rights in next financial year covered by hedging contracts as of reporting date 85.00%    
Carbon price risk | Cash Flow Hedges | European Union Allowance (EUA), carbon rights      
Disclosure of detailed information about financial instruments [line items]      
Hedged purchase price per unit | € / Right 65 76  
Carbon price risk | Cash Flow Hedges | United Kingdom Allowance (UKA), carbon rights      
Disclosure of detailed information about financial instruments [line items]      
Hedged purchase price per unit | £ / Right 58 66