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Equity - Other Equity Instruments (Details) - EUR (€) € in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Nov. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Equity Instruments [Roll Forward] |  |  |  |  |
Premium of tender offer | € (1) |  | € (1) | € 61 |
Telefonica Europe, B.V. |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Amount repurchased | (129) | € (621) |  |  |
Retained earnings |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Payments on undated deeply subordinated securities |  |  | 201 | 263 | € 335
Term debt | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | 7,550 |  |
Carrying value of deeply subordinated securities, ending balance | 7,550 |  | 7,550 | 7,550 |
Exercisable from issuer in 2028 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | 750 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 750 |  | € 750 | 750 |
Exercisable from issuer in 2028 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 2.875% |  | 2.875% |  |
Exercisable from issuer in 2029 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 1,000 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 1,000 |  | € 1,000 | 1,000 |
Exercisable from issuer in 2029 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 2.376% |  | 2.376% |  |
Exercisable from issuer in 2027 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 500 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 500 |  | € 500 | 500 |
Exercisable from issuer in 2027 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 2.502% |  | 2.502% |  |
Exercisable from issuer in 2027 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 500 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 500 |  | € 500 | 500 |
Exercisable from issuer in 2027 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 2.875% |  | 2.875% |  |
Exercisable from issuer in 2025 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 1,300 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 1,300 |  | € 1,300 | 1,300 |
Exercisable from issuer in 2025 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 4.375% |  | 4.375% |  |
Exercisable from issuer in 2023 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 824 |  |
Tender Offer |  |  | 824 |  |
Amount repurchased |  |  | (74) |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 750 |  | € 750 | 824 |
Exercisable from issuer in 2023 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 3.00% |  | 3.00% |  |
Exercisable from issuer in 2026, issued 03/22/18 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 1,000 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 1,000 |  | € 1,000 | 1,000 |
Exercisable from issuer in 2026, issued 03/22/18 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 3.875% |  | 3.875% |  |
Exercisable from issuer in 2023 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 676 |  |
Tender Offer |  |  | 676 |  |
Amount repurchased |  |  | (547) |  |
Redemption |  |  | (129) |  |
Carrying value of deeply subordinated securities, ending balance | € 0 |  | € 0 | 676 |
Exercisable from issuer in 2023 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 2.625% |  | 2.625% |  |
Exercisable from issuer in 2024 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 1,000 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 1,000 |  | € 1,000 | 1,000 |
Exercisable from issuer in 2024 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 5.875% |  | 5.875% |  |
Subordinated securities, issued February 2021 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance | € 750 |  |  |  |
Carrying value of deeply subordinated securities, ending balance |  | € 750 |  |  |
Undated Deeply Subordinated Securities, Exercisable From Issuer In 2028, Issued 11/23/2022 | Gross carrying amount |  |  |  |  |
Equity Instruments [Roll Forward] |  |  |  |  |
Carrying value of deeply subordinated securities, beginning balance |  |  | € 0 |  |
Tender Offer |  |  | 0 |  |
Amount repurchased |  |  | 0 |  |
Redemption |  |  | 0 |  |
Carrying value of deeply subordinated securities, ending balance | € 750 |  | € 750 | € 0 |
Undated Deeply Subordinated Securities, Exercisable From Issuer In 2028, Issued 11/23/2022 | Fixed interest rate |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual Fix | 7.125% |  | 7.125% |  |

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