Payables and Other Current Liabilities - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Trade And Other Payables [Line Items]
Current government grants	€ 24	€ 17
Maximum
Trade And Other Payables [Line Items]
Weighted average maturity period	60 days
Telefónica, S.A.
Trade And Other Payables [Line Items]
Weighted average maturity period	51 days	53 days

The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Government grants]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

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