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Equity - Share Capital and Share Premium (Details) - EUR (€) |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
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Apr. 08, 2022 | Dec. 23, 2021 | Jun. 22, 2021 | Apr. 23, 2021 | Dec. 04, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 24, 2022 | Nov. 03, 2021 | Jun. 30, 2020 | Jun. 12, 2020 | Dec. 31, 2019
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net movement in treasury shares |  |  |  |  |  |  |  |  | € 364,000,000 | € 479,000,000 | € 224,000,000 |  |  |  |  |
Equity |  |  |  |  |  | € 31,708,000,000 | € 28,684,000,000 | € 18,260,000,000 | € 31,708,000,000 | € 28,684,000,000 | € 18,260,000,000 |  |  |  |  | € 25,450,000,000
Capital reduction by means of a redemption of treasury shares (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 1.65% |  |  |
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 | 139,329,370 | 98,231,380 | 85,217,621 | 139,329,370 | 98,231,380 |  |  |  |  | 77,562,635
Net movement in treasury shares |  |  |  |  |  |  |  |  | € 342,000,000 | € 459,000,000 | € 195,000,000 |  |  |  |  |
Capital reduction (shares) | (139,275,057) |  |  | (82,896,466) |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  | € (341,000,000) | € (547,000,000) | € (476,000,000) | (341,000,000) | (547,000,000) | (476,000,000) |  |  |  |  | € (766,000,000)
Share capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares (in shares) | 5,639,772,963 |  |  | 5,443,534,596 |  |  |  |  |  |  |  |  |  |  |  |
Net movement in treasury shares | € 139,275,057 |  |  | € 82,896,466 |  |  |  |  |  |  |  |  |  |  |  |
Equity | 5,639,772,963 | 5,779,048,020 | € 5,638,053,507 | 5,443,534,596 |  | 5,775,000,000 | 5,779,000,000 | 5,526,000,000 | 5,775,000,000 | 5,779,000,000 | 5,526,000,000 | € 5,775,237,554 |  |  |  | 5,192,000,000
Capital increase |  | € 140,994,513 | € 194,518,911 |  |  | € 135,464,591 |  |  |  |  |  |  |  |  |  |
Number of shares issued as dividends (in shares) |  | 140,994,513 | 194,518,911 |  |  | 135,464,591 |  |  |  |  |  |  |  |  |  |
Share premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net movement in treasury shares | € 409,000,000 |  |  | € 305,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  | € 3,824,000,000 | 4,233,000,000 | € 4,538,000,000 | 3,824,000,000 | 4,233,000,000 | € 4,538,000,000 |  |  |  |  | € 4,538,000,000
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital amount |  |  |  |  |  | € 5,775,237,554 | € 5,779,048,020 |  | € 5,775,237,554 | € 5,779,048,020 |  |  |  |  |  |
Number of shares (in shares) |  |  |  |  |  | 5,775,237,554 | 5,779,048,020 |  | 5,775,237,554 | 5,779,048,020 |  |  |  |  |  |
Par value per share (EUR per share) | € 1 | € 1 | € 1 |  | € 1 | € 1 | € 1 |  | € 1 | € 1 |  | € 1 |  | € 1 |  |
Capital reduction (shares) |  | 140,994,513 |  |  | 197,993,390 | 135,464,591 | 194,518,911 | 136,305,986 |  |  |  |  |  |  |  |
Maximum authorized share capital |  |  |  |  |  | € 2,596,065,843 |  |  | € 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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