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Accounting Policies - Intangible Assets (Details) | 12 Months Ended
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Dec. 31, 2024
Customer base | Minimum |
Disclosure of detailed information about intangible assets [line items] |
Amortization term length | 3 years
Customer base | Maximum |
Disclosure of detailed information about intangible assets [line items] |
Amortization term length | 14 years
Software | Minimum |
Disclosure of detailed information about intangible assets [line items] |
Amortization term length | 2 years
Software | Maximum |
Disclosure of detailed information about intangible assets [line items] |
Amortization term length | 5 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Useful Lives Or Amortisation Rates Intangible Assets Other Than Goodwill, Period + References No definition available. + Details
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Namespace Prefix: | tef_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |