v3.25.4
Intangible assets - Schedule of changes in intangible assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January € 1,334 € 1,198
Additions 35 50
Capitalised expenses 380 324
Amortisation (223) (216)
Impairments (7) (12)
Exchange rate differences (9) 9
Disposals (2) (9)
Other changes 2 (10)
Closing balance 1,510 1,334
Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January 3,471  
Closing balance 3,767 3,471
Accumulated amortisation    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January (2,084)  
Closing balance (2,201) (2,084)
Accumulated impairments    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January (53)  
Closing balance (55) (53)
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January 476 469
Additions 6
Impairments
Exchange rate differences 1 1
Closing balance 477 476
Goodwill | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January 476  
Closing balance 477 476
Goodwill | Accumulated impairments    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January  
Closing balance
Software    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January 855 727
Additions 35 43
Capitalised expenses 380 324
Amortisation (223) (215)
Impairments (7) (12)
Exchange rate differences (10) 8
Disposals (2) (9)
Other changes 2 (10)
Closing balance 1,030 855
Software | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January 2,986  
Closing balance 3,281 2,986
Software | Accumulated amortisation    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January (2,079)  
Closing balance (2,197) (2,079)
Software | Accumulated impairments    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January (52)  
Closing balance (53) (52)
Other    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January 3 2
Additions 1
Capitalised expenses
Amortisation
Impairments
Exchange rate differences
Disposals
Other changes 1
Closing balance 3 3
Other | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January 8  
Closing balance 9 8
Other | Accumulated amortisation    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January (4)  
Closing balance (4) (4)
Other | Accumulated impairments    
Disclosure of detailed information about intangible assets [line items]    
Opening balance as at 1 January (2)  
Closing balance € (1) € (2)