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Equity - Treasury shares additional information (Details) - EUR (€)
€ / shares in Units, € in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 12 Months Ended
Nov. 03, 2023
May 12, 2023
Mar. 01, 2023
Mar. 31, 2023
Dec. 31, 2023
Feb. 05, 2024
Feb. 29, 2024
Oct. 13, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]                      
Share buyback programme (in shares)               121,300,000      
Purchased Share buyback programme                 € 3,482 € 1,721 € 1,604
Cancelled share buyback programme (in shares)       107,000,000         228,350,000 180,461,000  
Cancellation of treasury shares       € 1,201         € 2 € 2  
Major ordinary share transactions                      
Disclosure of classes of share capital [line items]                      
Share buyback programme (in shares)           194,800,000          
Share Repurchase Program One                      
Disclosure of classes of share capital [line items]                      
Share buyback programme authorized     € 50                
Share buyback programme (in shares)                 3,000,000    
Shares repurchased, average price per share (in eur per share)                 € 13.18    
Purchased Share buyback programme                 € 42    
Share Repurchase Program Two                      
Disclosure of classes of share capital [line items]                      
Share buyback programme authorized   € 1,500                  
Share buyback programme (in shares)                 121,000,000    
Shares repurchased, average price per share (in eur per share)                 € 12.91    
Shares repurchased, effective price per share (in eur per share)                 € 12.36    
Share Repurchase Program Three                      
Disclosure of classes of share capital [line items]                      
Share buyback programme authorized € 2,500                    
Share buyback programme (in shares)         154,000,000            
Shares repurchased, average price per share (in eur per share)         € 12.90            
Purchased Share buyback programme         € 1,982            
Share Repurchase Program Three | Major ordinary share transactions                      
Disclosure of classes of share capital [line items]                      
Share buyback programme (in shares)             195,000,000        
Shares repurchased, average price per share (in eur per share)             € 12.87        
Shares repurchased, effective price per share (in eur per share)             € 12.83