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Equity - Schedule of share capital (Details) - EUR (€)
€ / shares in Units, € in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]        
Authorised share capital, ordinary shares (in shares) 9,142,000,000 9,142,000,000 14,729,000,000  
Unissued share capital, ordinary shares (in shares) 5,643,806,000 5,415,461,000 10,824,935,000  
Issued share capital, ordinary shares (in shares) 3,498,194,000 3,726,539,000 3,904,065,000  
Authorised share capital, amount € 91 € 91 € 147  
Unissued share capital, amount 56 54 108  
Share capital € 35 € 37 € 39 € 39
Ordinary shares        
Disclosure of classes of share capital [line items]        
Par value (in eur per share) € 0.01