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Accounting Policies - Estimated Useful Life of Depreciable Assets (Details) | 12 Months Ended
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Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [line items] |
Period to qualify assets to condition necessary for intended use or sale | 18 months
Minimum | Buildings |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life | 25 years
Minimum | Plant and machinery |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life | 4 years
Minimum | Furniture, tools and other items |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life | 2 years
Maximum | Buildings |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life | 40 years
Maximum | Plant and machinery |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life | 30 years
Maximum | Furniture, tools and other items |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life | 10 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
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period To Qualify Assets To Condition Necessary For Intended Use Or Sale + References No definition available. + Details
Name: | tef_PeriodToQualifyAssetsToConditionNecessaryForIntendedUseOrSale
Namespace Prefix: | tef_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful Lives Or Depreciation Rates, Property, Plant And Equipment, 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
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_MachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |