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Equity - Treasury Share Instruments (Details) - EUR (€)
€ / shares in Units, € in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]      
Acquisition price (EUR per share) € 3.87 € 4.00 € 3.92
Trading price (EUR per share) € 3.53 € 3.39 € 3.85
Market value € 393 € 288 € 537
Proportion of total shares classified as treasury shares (as a percent) 1.932% 1.476% 2.411%
Treasury Shares Activity [Roll Forward]      
Purchase of treasury shares € 223 € 365 € 478
Derivative financial instrument notional shares equivalent 193,000,000 193,000,000  
Treasury Shares      
Disclosure of classes of share capital [line items]      
Number of shares (in shares) 111,099,480 85,217,621 139,329,370
Treasury Shares Activity [Roll Forward]      
Treasury shares, beginning balance 85,217,621 139,329,370 98,231,380
Acquisitions (shares) 60,070,274 90,403,530 122,032,764
Scrip dividend (shares)   563,415 6,291,518
Employee share option plan (shares) (8,845,558) (5,391,956) (4,329,826)
Capital increase (reduction) (shares) (24,779,409) (139,275,057) (82,896,466)
Treasury shares, sales (in shares) (563,448) (411,681)  
Treasury shares, ending balance 111,099,480 85,217,621 139,329,370