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Equity - Treasury Share Instruments (Details) - EUR (€) € / shares in Units, € in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 28, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of classes of share capital [line items] |  |  |  |
Acquisition price (EUR per share) |  | € 4.00 | € 3.92 | € 4.84
Trading price (EUR per share) |  | € 3.39 | € 3.85 | € 3.25
Market value |  | € 288 | € 537 | € 319
Proportion of total shares classified as treasury shares (as a percent) |  | 1.476% | 2.411% | 1.777%
Treasury Shares Activity [Roll Forward] |  |  |  |
Purchase of treasury shares |  | € 365 | € 478 | € 234
Investments accounted for by the equity method |  | € 11,587 | € 12,773 |
Derivative financial instrument notional shares equivalent |  | 193,000,000 | 192,000,000 |
Treasury shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares (in shares) |  | 85,217,621 | 139,329,370 | 98,231,380
Treasury Shares Activity [Roll Forward] |  |  |  |
Treasury shares, beginning balance |  | 139,329,370 | 98,231,380 | 77,562,635
Acquisitions (shares) |  | 90,403,530 | 122,032,764 | 68,640,303
Scrip dividend (shares) |  | 563,415 | 6,291,518 | 6,252,817
Employee share option plan (shares) |  | (5,391,956) | (4,329,826) | (3,118,898)
Capital increase (reduction) (shares) |  | (139,275,057) | (82,896,466) |
Treasury shares, other increase (decrease) |  |  |  | (51,105,477)
Treasury shares, sales (in shares) |  | (411,681) |  |
Treasury shares, ending balance |  | 85,217,621 | 139,329,370 | 98,231,380
Movistar Prosegur Alarmas |  |  |  |
Treasury Shares Activity [Roll Forward] |  |  |  |
Investments accounted for by the equity method |  | € 0 |  |
Associates and Joint Ventures |  |  |  |
Treasury Shares Activity [Roll Forward] |  |  |  |
Investments accounted for by the equity method |  | € 11,587 | € 12,773 | € 427
Associates and Joint Ventures | Movistar Prosegur Alarmas |  |  |  |
Treasury Shares Activity [Roll Forward] |  |  |  |
Proportion of ownership interest in equity method investment | 50.00% |  |  |
Number of shares issued for equity method investment (in shares) | 49,545,262 |  |  |
Investments accounted for by the equity method | € 266 |  |  |

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2022-03-24 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2022-en-r&anchor=para_24_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_e&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2022-03-24 -Paragraph B16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2022-03-24 + Details
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