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Intangible assets - Schedule of changes in intangible assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January € 1,198 € 1,102  
Additions 50 64  
Capitalised expenses 324 246  
Amortisation (216) (213) € (226)
Impairments (12) (5)  
Exchange rate differences 9 7  
Disposals (9) (10)  
Changes in the composition of the group and other changes (10) 8  
Closing balance 1,334 1,198 1,102
Gross carrying amount      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January 3,123    
Closing balance 3,471 3,123  
Accumulated amortisation      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January (1,879)    
Closing balance (2,084) (1,879)  
Accumulated impairments      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January (45)    
Closing balance (53) (45)  
Goodwill      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January 469 464  
Additions 6    
Impairments  
Exchange rate differences 1 5  
Closing balance 476 469 464
Goodwill | Gross carrying amount      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January 469    
Closing balance 476 469  
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 727 636  
Additions 43 64  
Capitalised expenses 324 246  
Amortisation (215) (213)  
Impairments (12) (5)  
Exchange rate differences 8 2  
Disposals (9) (10)  
Changes in the composition of the group and other changes (10) 8  
Closing balance 855 727 636
Software | Gross carrying amount      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January 2,646    
Closing balance 2,986 2,646  
Software | Accumulated amortisation      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January (1,876)    
Closing balance (2,079) (1,876)  
Software | Accumulated impairments      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January (43)    
Closing balance (52) (43)  
Other      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January 2 2  
Additions 1  
Capitalised expenses  
Amortisation  
Impairments  
Exchange rate differences  
Disposals  
Changes in the composition of the group and other changes 1  
Closing balance 3 2 € 2
Other | Gross carrying amount      
Disclosure of detailed information about intangible assets [line items]      
Opening balance as at 1 January 8    
Closing balance 8 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 € (2) € (2)