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Financial Liabilities - Breakdown of Financial Liabilities (Details) - Telefónica, S.A. - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of financial liabilities [line items] |  |
Total carrying amount | € 38,782 | € 37,061
Total fair value | 37,718 | 35,993
Level 1 (Quoted prices) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Level 2 (Other directly observable market inputs) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 2,064 | 1,893
Level 3 (Inputs not based on observable market data) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Held for trading |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 471 | 582
Fair value option |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Hedges |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 1,593 | 1,311
Liabilities at amortized cost |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 36,718 | 35,168
Issues |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 32,704 | 31,567
Total fair value | 31,638 | 30,498
Issues | Level 1 (Quoted prices) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Issues | Level 2 (Other directly observable market inputs) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Issues | Level 3 (Inputs not based on observable market data) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Issues | Held for trading |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Issues | Fair value option |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Issues | Hedges |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Issues | Liabilities at amortized cost |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 32,704 | 31,567
Loans and other payables |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 4,014 | 3,601
Total fair value | 4,016 | 3,602
Loans and other payables | Level 1 (Quoted prices) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Loans and other payables | Level 2 (Other directly observable market inputs) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Loans and other payables | Level 3 (Inputs not based on observable market data) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Loans and other payables | Held for trading |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Loans and other payables | Fair value option |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Loans and other payables | Hedges |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Loans and other payables | Liabilities at amortized cost |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 4,014 | 3,601
Derivative instruments |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 2,064 | 1,893
Total fair value | 2,064 | 1,893
Derivative instruments | Level 1 (Quoted prices) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Derivative instruments | Level 2 (Other directly observable market inputs) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 2,064 | 1,893
Derivative instruments | Level 3 (Inputs not based on observable market data) |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Derivative instruments | Held for trading |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 471 | 582
Derivative instruments | Fair value option |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 0 | 0
Derivative instruments | Hedges |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | 1,593 | 1,311
Derivative instruments | Liabilities at amortized cost |  |
Disclosure of financial liabilities [line items] |  |
Total carrying amount | € 0 | € 0

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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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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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