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Equity - Share Capital and Share Premium Narrative (Details) - EUR (€) |  |  |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 12, 2024 | Mar. 31, 2023 | Dec. 23, 2021 | Dec. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 24, 2022 | Dec. 31, 2021 | Jun. 12, 2020
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Net movement in treasury shares |  |  |  |  | € 56,000,000 | € 221,000,000 | € 364,000,000 |  |  |
Equity |  |  |  | € 31,708,000,000 | € 22,749,000,000 | € 27,096,000,000 | € 31,708,000,000 |  | € 28,684,000,000 |
Aggregate amount of approved securities issuance |  |  | € 25,000,000,000 |  |  |  |  |  |  |
Treasury Shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares (in shares) |  |  |  | 85,217,621 | 26,874,751 | 111,099,480 | 85,217,621 |  | 139,329,370 |
Net movement in treasury shares |  |  |  |  | € (13,000,000) | € 186,000,000 | € 342,000,000 |  |  |
Increase (decrease) in number of shares outstanding | 80,296,591 | 24,779,409 |  |  |  |  |  |  |  |
Equity |  |  |  | € (341,000,000) | (106,000,000) | (429,000,000) | (341,000,000) |  | € (547,000,000) |
Share capital |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares (in shares) | 5,670,161,554 | 5,750,458,145 |  |  |  |  |  |  |  |
Par value per share (EUR per share) |  | € 1 |  |  |  |  |  |  |  |
Net movement in treasury shares | € 80,296,591 | € 24,779,409 |  |  |  |  |  |  |  |
Equity | 5,670,161,554 | 5,750,458,145 |  | 5,775,000,000 | 5,670,000,000 | 5,750,000,000 | 5,775,000,000 |  | 5,779,000,000 |
Share premium |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Net movement in treasury shares | € 230,000,000 | € 73,000,000 |  |  |  |  |  |  |  |
Equity |  |  |  | € 3,824,000,000 | 3,521,000,000 | 3,751,000,000 | € 3,824,000,000 |  | € 4,233,000,000 |
Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Share capital amount |  |  |  |  | € 5,670,161,554 | € 5,750,458,145 |  |  |  |
Number of shares (in shares) |  |  |  |  | 5,670,161,554 | 5,750,458,145 |  |  |  |
Par value per share (EUR per share) | € 1 |  |  |  | € 1 | € 1 |  | € 1 |  |
Increase (decrease) in number of shares outstanding |  |  |  | (135,464,591) |  |  |  |  |  |
Maximum authorized share capital |  |  |  |  | € 2,596,065,843 |  |  |  |  | € 2,596,065,843
Treasury Shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Par value per share (EUR per share) | € 1 | € 1 |  |  |  |  |  |  |  |

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