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Share Buyback (Details) - EUR (€)
€ in Millions
 12 Months Ended
Feb. 10, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]        
Number of shares acquired (in shares)   31,734,256 34,217,605  
Repurchase of shares [1]   € (1,507) € (1,509) € (3,018)
Top of range        
Disclosure of classes of share capital [line items]        
Value of share buyback programme € 3,000      
[1] Repurchase of shares reflects the cost of acquiring ordinary shares as part of the share buyback programme announced on 29 April 2021 and 10 February 2022.