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Long-term incentive plans based on Telefónica, S.A. shares - Schedule of Number of Shares Assigned and Outstanding (Details) | 12 Months Ended | 36 Months Ended
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Dec. 31, 2024 shares € / shares | Dec. 31, 2023 shares € / shares | Dec. 31, 2026 shares | Dec. 31, 2025 shares | Dec. 31, 2024 shares € / shares | Dec. 31, 2023 shares € / shares | Dec. 30, 2023 shares
First cycle | Performance Share Plan 2021-2025 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  |  |  |  |  |  | 19,425,499
Outstanding shares (shares) |  | 17,728,523 |  |  |  | 17,728,523 |
First cycle | Performance Share Plan 2021-2025 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  | 9,712,749 |  |  |  |  |
Outstanding shares (shares) |  | 8,864,262 |  |  |  | 8,864,262 |
Unit fair value (in euro per share) | € / shares |  | € 2.64 |  |  |  | € 2.64 |
First cycle | Performance Share Plan 2021-2025 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  | 7,770,200 |  |  |  |  |
Outstanding shares (shares) |  | 7,091,409 |  |  |  | 7,091,409 |
Unit fair value (in euro per share) | € / shares |  | € 3.15 |  |  |  | € 3.15 |
First cycle | Performance Share Plan 2021-2025 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  | 1,942,550 |  |  |  |  |
Outstanding shares (shares) |  | 1,772,852 |  |  |  | 1,772,852 |
Unit fair value (in euro per share) | € / shares |  | € 3.15 |  |  |  | € 3.15 |
First cycle | Talent for the Future Share Plan 2021-2025 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  |  |  |  |  | 1,751,500 |
Outstanding shares (shares) |  | 1,557,000 |  |  |  | 1,557,000 |
First cycle | Talent for the Future Share Plan 2021-2025 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 875,750 |  |  |  |  |  |
Outstanding shares (shares) | 778,500 |  |  |  | 778,500 |  |
Unit fair value (in euro per share) | € / shares | € 2.64 |  |  |  | € 2.64 |  |
First cycle | Talent for the Future Share Plan 2021-2025 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 700,600 |  |  |  |  |  |
Outstanding shares (shares) | 622,800 |  |  |  | 622,800 |  |
Unit fair value (in euro per share) | € / shares | € 3.15 |  |  |  | € 3.15 |  |
First cycle | Talent for the Future Share Plan 2021-2025 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 175,150 |  |  |  |  |  |
Outstanding shares (shares) | 155,700 |  |  |  | 155,700 |  |
Unit fair value (in euro per share) | € / shares | € 3.15 |  |  |  | € 3.15 |  |
First cycle | Talent For The Future Share Plan 2024-2028 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  |  | 1,530,500 |  |  |  |
Outstanding shares (shares) | 1,513,500 |  |  |  | 1,513,500 |  |
First cycle | Talent For The Future Share Plan 2024-2028 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 765,250 |  |  |  |  |  |
Outstanding shares (shares) | 756,750 |  |  |  | 756,750 |  |
Unit fair value (in euro per share) | € / shares | € 2.85 |  |  |  | € 2.85 |  |
First cycle | Talent For The Future Share Plan 2024-2028 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 612,200 |  |  |  |  |  |
Outstanding shares (shares) | 605,400 |  |  |  | 605,400 |  |
Unit fair value (in euro per share) | € / shares | € 3.42 |  |  |  | € 3.42 |  |
First cycle | Talent For The Future Share Plan 2024-2028 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 76,525 |  |  |  |  |  |
Outstanding shares (shares) | 75,675 |  |  |  | 75,675 |  |
Unit fair value (in euro per share) | € / shares | € 3.42 |  |  |  | € 3.42 |  |
First cycle | Talent For The Future Share Plan 2024-2028 | Women managers |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 76,525 |  |  |  |  |  |
Outstanding shares (shares) | 75,675 |  |  |  | 75,675 |  |
Unit fair value (in euro per share) | € / shares | € 3.42 |  |  |  | € 3.42 |  |
First cycle | Performance Share Plan 2024-2028 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Outstanding shares (shares) | 15,317,175 |  |  |  | 15,317,175 |  |
Second cycle | Performance Share Plan 2021-2025 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  |  |  |  | 15,069,650 |  |
Outstanding shares (shares) | 13,851,509 |  |  |  | 13,851,509 |  |
Second cycle | Performance Share Plan 2021-2025 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 7,534,825 |  |  |  |  |  |
Outstanding shares (shares) | 6,925,755 |  |  |  | 6,925,755 |  |
Unit fair value (in euro per share) | € / shares | € 2.43 |  |  |  | € 2.43 |  |
Second cycle | Performance Share Plan 2021-2025 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 6,027,860 |  |  |  |  |  |
Outstanding shares (shares) | 5,540,604 |  |  |  | 5,540,604 |  |
Unit fair value (in euro per share) | € / shares | € 2.95 |  |  |  | € 2.95 |  |
Second cycle | Performance Share Plan 2021-2025 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 1,506,965 |  |  |  |  |  |
Outstanding shares (shares) | 1,385,150 |  |  |  | 1,385,150 |  |
Unit fair value (in euro per share) | € / shares | € 2.95 |  |  |  | € 2.95 |  |
Second cycle | Talent for the Future Share Plan 2021-2025 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  |  |  |  | 1,646,500 |  |
Outstanding shares (shares) | 1,458,000 |  |  |  | 1,458,000 |  |
Second cycle | Talent for the Future Share Plan 2021-2025 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 823,250 |  |  |  |  |  |
Outstanding shares (shares) | 729,000 |  |  |  | 729,000 |  |
Unit fair value (in euro per share) | € / shares | € 2.43 |  |  |  | € 2.43 |  |
Second cycle | Talent for the Future Share Plan 2021-2025 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 658,600 |  |  |  |  |  |
Outstanding shares (shares) | 583,200 |  |  |  | 583,200 |  |
Unit fair value (in euro per share) | € / shares | € 2.95 |  |  |  | € 2.95 |  |
Second cycle | Talent for the Future Share Plan 2021-2025 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 164,650 |  |  |  |  |  |
Outstanding shares (shares) | 145,800 |  |  |  | 145,800 |  |
Unit fair value (in euro per share) | € / shares | € 2.95 |  |  |  | € 2.95 |  |
Third cycle | Performance Share Plan 2021-2025 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 8,309,282 |  |  |  |  |  |
Outstanding shares (shares) | 7,928,329 |  |  |  | 7,928,329 |  |
Unit fair value (in euro per share) | € / shares | € 1.77 |  |  |  | € 1.77 |  |
Third cycle | Performance Share Plan 2021-2025 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 6,647,426 |  |  |  |  |  |
Outstanding shares (shares) | 6,342,664 |  |  |  | 6,342,664 |  |
Unit fair value (in euro per share) | € / shares | € 2.81 |  |  |  | € 2.81 |  |
Third cycle | Performance Share Plan 2021-2025 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 1,661,856 |  |  |  |  |  |
Outstanding shares (shares) | 1,585,665 |  |  |  | 1,585,665 |  |
Unit fair value (in euro per share) | € / shares | € 2.81 |  |  |  | € 2.81 |  |
Third cycle | Talent for the Future Share Plan 2021-2025 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) |  |  |  | 1,771,500 |  |  |
Outstanding shares (shares) | 1,663,000 |  |  |  | 1,663,000 |  |
Third cycle | Talent for the Future Share Plan 2021-2025 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 885,750 |  |  |  |  |  |
Outstanding shares (shares) | 831,500 |  |  |  | 831,500 |  |
Unit fair value (in euro per share) | € / shares | € 1.77 |  |  |  | € 1.77 |  |
Third cycle | Talent for the Future Share Plan 2021-2025 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 708,600 |  |  |  |  |  |
Outstanding shares (shares) | 665,200 |  |  |  | 665,200 |  |
Unit fair value (in euro per share) | € / shares | € 2.81 |  |  |  | € 2.81 |  |
Third cycle | Talent for the Future Share Plan 2021-2025 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 177,150 |  |  |  |  |  |
Outstanding shares (shares) | 166,300 |  |  |  | 166,300 |  |
Unit fair value (in euro per share) | € / shares | € 2.81 |  |  |  | € 2.81 |  |
Third cycle | Performance Share Plan 2024-2028 | TSR objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 7,676,879 |  |  |  |  |  |
Outstanding shares (shares) | 7,658,587 |  |  |  | 7,658,587 |  |
Unit fair value (in euro per share) | € / shares | € 2.85 |  |  |  | € 2.85 |  |
Third cycle | Performance Share Plan 2024-2028 | FCF objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 6,141,504 |  |  |  |  |  |
Outstanding shares (shares) | 6,126,870 |  |  |  | 6,126,870 |  |
Unit fair value (in euro per share) | € / shares | € 3.42 |  |  |  | € 3.42 |  |
Third cycle | Performance Share Plan 2024-2028 | C02 E.N. objective |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 767,688 |  |  |  |  |  |
Outstanding shares (shares) | 765,859 |  |  |  | 765,859 |  |
Unit fair value (in euro per share) | € / shares | € 3.42 |  |  |  | € 3.42 |  |
Third cycle | Performance Share Plan 2024-2028 | Women managers |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
No. of shares assigned (shares) | 767,688 |  |  |  |  |  |
Outstanding shares (shares) | 765,859 |  |  |  | 765,859 |  |
Unit fair value (in euro per share) | € / shares | € 3.42 |  |  |  | € 3.42 |  |

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