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Lease Liabilities - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of finance lease and operating lease by lessee [Line Items]
Additions related to fixed asset sale and leaseback transactions	€ 125	€ 51
Capital gains arising from sale and leaseback transactions	381	263	€ 79
Additions	2,487	2,030
Lease liabilities not yet commenced	1,569	1,307
Lease liabilities	8,677	8,070	€ 5,294
Transfers and others	223	59
Sale of the towers division of Telxius		2,650
Telxius Group
Disclosure of finance lease and operating lease by lessee [Line Items]
Lease liabilities		2,775
Sale of the towers division of Telxius		125
Oi Group
Disclosure of finance lease and operating lease by lessee [Line Items]
Additions	117
Incremental Group
Disclosure of finance lease and operating lease by lessee [Line Items]
Additions	2
BE-terna
Disclosure of finance lease and operating lease by lessee [Line Items]
Additions	€ 5
Cancom Ltd.
Disclosure of finance lease and operating lease by lessee [Line Items]
Additions		14
Pegaso PCS S.A. de CV
Disclosure of finance lease and operating lease by lessee [Line Items]
Transfers and others		264
Telefónica El Salvador
Disclosure of finance lease and operating lease by lessee [Line Items]
Transfers and others		€ 43

X

- Definition

The gains (losses) arising from sale and leaseback transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 53
-Subparagraph i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_53_i&doctype=Standard
-URIDate 2022-03-24

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X

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2022-03-24

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- Definition

Addition Of Lease Liabilities, Sale Of Divisions

+ References

No definition available.

+ Details

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X

- Definition

Additions to Lease Liabilities

+ References

No definition available.

+ Details

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X

- Definition

Additions to Lease Liabilities related to Fixed Asset Sale and Leaseback Transaction

+ References

No definition available.

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- Definition

[Line Items] for Disclosure of finance lease and operating lease by lessee [Table]

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- Definition

Exposure Arising From Leases Not Yet Commenced To Which Lessee Is Committed

+ References

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- Definition

Transfers and Others of Lease Liabilities

+ References

No definition available.

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