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Other disclosures - Share-based payment schemes - Outstanding restricted stock units (Details) - shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding at the beginning of the year (in shares) 21,400,000 19,800,000  
Outstanding at the end of the year (in shares) 18,900,000 21,400,000 19,800,000
Restricted stock units to employees | 2023      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share) 3,000,000.0    
Long-term share-based incentive programme (Management Board) | 2023      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share) 600,000    
Long-term share-based incentive programme (Management Board) | 2022      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share)   700,000  
Long-term share-based incentive programme (Management Board) | 2021      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share)     1,000,000.0
Management group below Management Board | 2023      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share) 3,100,000    
Management group below Management Board | 2022      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share)   3,300,000  
Management group below Management Board | 2021      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share)     3,000,000.0
Restricted stock units to individual employees | 2023      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share) 300,000    
Restricted stock units to individual employees | 2022      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share)   800,000  
Restricted stock units to individual employees | 2021      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Allocated in the year (per share)     300,000