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Consolidated shareholders’ equity - Summary of Repurchases Program (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
2023      
Disclosure of classes of share capital [line items]      
Number of shares (in shares) 2,584,540    
Value € 230    
2022      
Disclosure of classes of share capital [line items]      
Number of shares (in shares) 4,000,204 1,510,000  
Value € 363 € 137  
2021      
Disclosure of classes of share capital [line items]      
Number of shares (in shares)   3,976,992 2,765,388
Value   € 360 € 242
2020      
Disclosure of classes of share capital [line items]      
Number of shares (in shares)     1,758,569
Value     € 140