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Financial instruments - Fair values and risk management - Jet fuel and carbon credits price risk (Details)
€ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
EUR (€)
€ / Right
£ / Right
$ / t
Mar. 31, 2022
EUR (€)
$ / t
£ / Right
€ / Right
Mar. 31, 2021
EUR (€)
$ / t
Forecast            
Disclosure of detailed information about financial instruments [line items]            
Estimated percentage of jet fuel expenses covered by hedging contracts as of reporting date 14.00% 14.00% 75.00%      
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       € (7) € (40)  
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       € 4 47  
Percentage of Reasonably Possible Increase in Risk Assumption       10.00%    
Increase (Decrease) In Equity Due To Reasonably Possible decrease In Designated Risk Component       € (258) (234)  
Increase (Decrease) In Equity Due To Reasonably Possible Increase In Designated Risk Component       € 258 234  
Jet fuel risk | Cash Flow Hedges            
Disclosure of detailed information about financial instruments [line items]            
Hedging percentage, policy       90.00%    
Jet fuel risk | Cash Flow Hedges | Jet Fuel Hedges            
Disclosure of detailed information about financial instruments [line items]            
Hedge ineffectiveness charge       € 0 € 0 € 219
Jet fuel risk | Cash Flow Hedges | Jet fuel forward contracts            
Disclosure of detailed information about financial instruments [line items]            
Nominal amount of hedging instrument       3,300 1,800 609
Average Hedged Rate Per Tonne | $ / t       885 640 545
Hedge ineffectiveness charge       € 0    
Jet fuel risk | Cash Flow Hedges | Jet Fuel Swaps            
Disclosure of detailed information about financial instruments [line items]            
Hedge ineffectiveness charge       € 0    
Jet fuel risk | Forecast | Cash Flow Hedges            
Disclosure of detailed information about financial instruments [line items]            
Estimated percentage of jet fuel expenses covered by hedging contracts as of reporting date   8.00% 81.00%      
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       € (32) (26)  
Increase (Decrease) In Equity Due To Reasonably Possible Increase In Designated Risk Component       € 32 € 26  
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       75 48  
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       72 75  
Carbon price risk | Forecast | Cash Flow Hedges | European Union Allowance (EUA), carbon rights            
Disclosure of detailed information about financial instruments [line items]            
Estimated percentage of carbon emission rights covered by hedging contracts as of reporting date     54.00% 85.00%