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Equity - Treasury Share Instruments (Details) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of classes of share capital [line items] |  |  |
Acquisition price (EUR per share) | € 3.97 | € 3.87 | € 4.00
Trading price (EUR per share) | € 3.94 | € 3.53 | € 3.39
Market value | € 106 | € 393 | € 288
Proportion of total shares classified as treasury shares (as a percent) | 0.474% | 1.932% | 1.476%
Treasury Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares (in shares) | 26,874,751 | 111,099,480 | 85,217,621
Treasury Shares Activity [Roll Forward] |  |  |
Treasury shares, beginning balance | 111,099,480 | 85,217,621 | 139,329,370
Acquisitions (shares) | 36,525,204 | 60,070,274 | 90,403,530
Scrip dividend (shares) |  |  | 563,415
Employee share option plan (shares) | (19,909,898) | (8,845,558) | (5,391,956)
Capital reduction (shares) | (80,296,591) | (24,779,409) | (139,275,057)
Sales (in shares) | (20,543,444) | (563,448) | (411,681)
Treasury shares, ending balance | 26,874,751 | 111,099,480 | 85,217,621

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