Provisions - Distribution by Segment of Restructuring Costs (Details) - EUR (€) € in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of operating segments [line items]
Restructuring costs	€ 104	€ 1,538
Telefónica Spain \| Operating segments
Disclosure of operating segments [line items]
Restructuring costs	27	1,320
Telefónica Germany \| Operating segments
Disclosure of operating segments [line items]
Restructuring costs	(1)	11
Telefónica Hispam \| Operating segments
Disclosure of operating segments [line items]
Restructuring costs	61	128
Other companies \| Operating segments
Disclosure of operating segments [line items]
Restructuring costs	€ 17	€ 79

The amount of provision for restructuring, such as the sale or termination of a line of business; closure of business locations in a country or region or relocation of activities from one country or region to another; changes in management structure; and fundamental reorganisations that have a material effect on the nature and focus of the entity's operations. [Refer: Other provisions]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2024-01-01
-Paragraph 70
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_70&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_RestructuringProvision
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant