v3.25.1
Capital and financial risk management - Changes in assets and liabilities arising from financing activities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Changes in assets and liabilities arising from financing activities    
Balance at the beginning € 54,390 € 62,276
Cash Changes in Assets And Liabilities Arising From Financing Activities [Abstract]    
Proceeds from issuance of long-term borrowings 4,680 1,533
Repayment of borrowings (12,963) (10,106)
Net movement in short-term borrowings 78 (1,636)
Net movement in derivatives 404 144
Interest paid (2,705) (2,330)
Purchase of treasury shares (1,868)  
Other   (493)
Non-cash movements    
Fair value movements (45) 2,233
Foreign exchange 178 (169)
Interest costs 1,883 2,440
Lease additions 4,361 3,915
Transfer of assets and liabilities held for sale   (3,479)
Other 2,750 62
Balance at the end 51,143 54,390
Total borrowings    
Changes in assets and liabilities arising from financing activities    
Balance at the beginning 56,987 66,390
Cash Changes in Assets And Liabilities Arising From Financing Activities [Abstract]    
Proceeds from issuance of long-term borrowings 4,680 1,533
Repayment of borrowings (12,963) (10,106)
Net movement in short-term borrowings 78 (1,636)
Interest paid (2,975) (2,531)
Purchase of treasury shares 0  
Non-cash movements    
Fair value movements 0  
Foreign exchange 121 61
Interest costs 2,196 2,766
Lease additions 4,361 3,915
Transfer of assets and liabilities held for sale   (3,455)
Other 658 50
Balance at the end 53,143 56,987
Derivative assets and liabilities    
Changes in assets and liabilities arising from financing activities    
Balance at the beginning (2,702) (4,702)
Cash Changes in Assets And Liabilities Arising From Financing Activities [Abstract]    
Proceeds from issuance of long-term borrowings 0 0
Repayment of borrowings 0 0
Net movement in short-term borrowings 0 0
Net movement in derivatives 404 144
Interest paid 348 272
Purchase of treasury shares 0  
Non-cash movements    
Fair value movements (45) 2,233
Foreign exchange 61 (231)
Interest costs (356) (395)
Lease additions 0  
Transfer of assets and liabilities held for sale   (23)
Other (1) 0
Balance at the end (2,291) (2,702)
Financial liabilities under put options    
Changes in assets and liabilities arising from financing activities    
Balance at the beginning 0 485
Cash Changes in Assets And Liabilities Arising From Financing Activities [Abstract]    
Proceeds from issuance of long-term borrowings 0 0
Repayment of borrowings 0 0
Net movement in short-term borrowings 0 0
Interest paid 4 (17)
Purchase of treasury shares 0  
Other   (493)
Non-cash movements    
Fair value movements 0  
Interest costs 0 13
Lease additions 0  
Other 93 12
Balance at the end 97 0
Other liabilities    
Changes in assets and liabilities arising from financing activities    
Balance at the beginning 105 103
Cash Changes in Assets And Liabilities Arising From Financing Activities [Abstract]    
Proceeds from issuance of long-term borrowings 0 0
Repayment of borrowings 0 0
Net movement in short-term borrowings 0 0
Interest paid (82) (54)
Purchase of treasury shares (1,868)  
Non-cash movements    
Fair value movements 0  
Foreign exchange (4) 1
Interest costs 43 56
Lease additions 0  
Transfer of assets and liabilities held for sale   (1)
Other 2,000  
Balance at the end 194 105
Discontinued Operations    
Cash Changes in Assets And Liabilities Arising From Financing Activities [Abstract]    
Repayment of borrowings 0 1,136
Interest paid 0 103
Non-cash movements    
Interest costs € 0 € 111