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Intangible assets - Schedule of changes in intangible assets (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Jan. 01, 2022
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January € 1,102 € 1,156    
Additions 64 54    
Capitalised expenses 246 144    
Amortisation (213) (226) € (261)  
Impairments (5) (54)    
Exchange rate differences 7 2    
Disposals (10) (3)    
Changes in the composition of the group and other changes 8 3    
Closing balance 1,198 1,102 1,156  
Retail Turkey        
Disclosure of detailed information about intangible assets [line items]        
Goodwill inflation adjustment   25    
Goodwill impairment   32    
Retail Turkey | Discount rate        
Disclosure of detailed information about intangible assets [line items]        
Significant unobservable input, assets       0.2404
Retail Turkey | Terminal growth rate        
Disclosure of detailed information about intangible assets [line items]        
Significant unobservable input, assets       0.1040
Opening balance adjustment 1        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January 25    
Closing balance   25  
Gross carrying amount        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January 2,962      
Closing balance 3,123 2,962    
Accumulated amortisation        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January (1,790)      
Closing balance (1,879) (1,790)    
Accumulated impairments        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January (70)      
Closing balance (45) (70)    
Goodwill        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January 464 472    
Impairments (32)    
Exchange rate differences 5 (1)    
Closing balance 469 464 472  
Goodwill | Opening balance adjustment 1        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January 25    
Closing balance   25  
Goodwill | Gross carrying amount        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January 464      
Closing balance 469 464    
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 636 682    
Additions 64 54    
Capitalised expenses 246 144    
Amortisation (213) (226)    
Impairments (5) (22)    
Exchange rate differences 2 4    
Disposals (10) (3)    
Changes in the composition of the group and other changes 8 3    
Closing balance 727 636 682  
Software | Gross carrying amount        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January 2,491      
Closing balance 2,646 2,491    
Software | Accumulated amortisation        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January (1,787)      
Closing balance (1,876) (1,787)    
Software | Accumulated impairments        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January (69)      
Closing balance (43) (69)    
Other        
Disclosure of detailed information about intangible assets [line items]        
Opening balance as at 1 January 2 2    
Additions    
Capitalised expenses    
Amortisation    
Impairments    
Exchange rate differences    
Disposals    
Changes in the composition of the group and other changes 1    
Closing balance 2 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)