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Breakdown of Contractual Assets and Liabilities, and Capitalized Costs - Movement in Contract Assets (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Contract assets [abstract]
Contract assets, beginning balance	€ 554	€ 342
Additions	394	555
Disposals	(420)	(349)
Transfers	(1)	0
Translation differences and hyperinflation adjustments		6
Contract assets, ending balance	527	554
Long-term contracts
Contract assets [abstract]
Contract assets, beginning balance	359	209
Additions	118	261
Disposals	(17)	(12)
Transfers	(135)	(100)
Translation differences and hyperinflation adjustments		1
Contract assets, ending balance	325	359
Long-term contracts | Gross cost
Contract assets [abstract]
Contract assets, beginning balance	360	210
Additions	118	261
Disposals	(17)	(12)
Transfers	(135)	(100)
Translation differences and hyperinflation adjustments		1
Contract assets, ending balance	326	360
Long-term contracts | Impairment losses
Contract assets [abstract]
Contract assets, beginning balance	(1)	(1)
Additions	0	0
Disposals	0	0
Transfers	0	0
Translation differences and hyperinflation adjustments		0
Contract assets, ending balance	(1)	(1)
Short-term contracts
Contract assets [abstract]
Contract assets, beginning balance	195	133
Additions	276	294
Disposals	(403)	(337)
Transfers	134	100
Translation differences and hyperinflation adjustments		5
Contract assets, ending balance	202	195
Short-term contracts | Gross cost
Contract assets [abstract]
Contract assets, beginning balance	202	141
Additions	277	295
Disposals	(404)	(340)
Transfers	134	100
Translation differences and hyperinflation adjustments		6
Contract assets, ending balance	209	202
Short-term contracts | Impairment losses
Contract assets [abstract]
Contract assets, beginning balance	(7)	(8)
Additions	(1)	(1)
Disposals	1	3
Transfers	0	0
Translation differences and hyperinflation adjustments		(1)
Contract assets, ending balance	€ (7)	€ (7)

X

- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_105&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 116
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

The increase in contract assets resulting from business combinations. [Refer: Business combinations [member]; Contract assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 118
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_118_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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X

- Definition

Decrease Through Disposals, Contract Assets

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Increase (Decrease) Through Transfers, Contract Assets

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Increase (Decrease) Through Translation Differences And Hyperinflation Adjustments, Contract Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	tef_
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- Details

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