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Share-buy back (Details) - EUR (€)
€ in Millions
 6 Months Ended
Feb. 10, 2022
Jun. 30, 2023
Jun. 30, 2022
Disclosure of reserves within equity [line items]      
Number of shares acquired (in shares)   15,552,684  
Reourchase of shares [1]   € 753 € 648
Other reserves      
Disclosure of reserves within equity [line items]      
Reourchase of shares [1]   € 753 € 648
Top of range      
Disclosure of reserves within equity [line items]      
Share buyback program, authorized amount € 3,000    
[1] Repurchase of shares reflects the cost of acquiring ordinary shares as part of the share buyback program announced on 10 February 2022.