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Equity - Treasury shares additional information (Details) - EUR (€) € / shares in Units, € in Millions |  |  |  |  |  | 2 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
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Oct. 31, 2024 | May 02, 2024 | Mar. 05, 2024 | Mar. 04, 2024 | Nov. 03, 2023 | Dec. 31, 2024 | Feb. 29, 2024 | Oct. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Share buyback programme, amount |  |  |  |  |  |  |  |  | € 3,774 | € 3,482 | € 1,721
Share Repurchase Program One |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Share buyback programme authorized |  |  |  |  | € 2,500 |  |  |  |  |  |
Share buyback programme (in shares) |  |  |  |  |  |  | 195,000,000 |  |  |  |
Shares repurchased, effective price per share (in EUR per share) |  |  |  |  |  |  | € 12.83 |  |  |  |
Share Repurchase Program Two |  |  |  |  |  |  |  |  |  |  |
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) |  |  | € 12.99 |  |  |  |  |  |  |  |
Share buyback programme, amount |  |  | € 43 |  |  |  |  |  |  |  |
Share Repurchase Program Three |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Share buyback programme authorized |  | € 2,500 |  |  |  |  |  |  |  |  |
Share buyback programme (in shares) |  |  |  |  |  |  |  | 156,000,000 |  |  |
Shares repurchased, effective price per share (in EUR per share) |  |  |  |  |  |  |  | € 16.03 |  |  |
Share Repurchase Program Four |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Share buyback programme authorized | € 2,000 |  |  |  |  |  |  |  |  |  |
Share buyback programme (in shares) |  |  |  |  |  | 50,000,000 |  |  |  |  |
Shares repurchased, average price per share (in EUR per share) |  |  |  |  |  | € 14.97 |  |  |  |  |
Share buyback programme, amount |  |  |  |  |  | € 756 |  |  |  |  |

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