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Lease Liabilities - Movement of Lease Liabilities (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Movement of Lease Liabilities [Roll Forward]
Balance at beginning of period	€ 8,947	€ 8,677
Additions	2,082	2,382
Principal and interests payments	(2,647)	(2,559)
Principal payments (Note 28)	(2,143)	(2,114)
Interests payments	(504)	(445)
Disposals	(70)	(138)
Business combinations	2
Accrued interests	512	435
Translation differences and inflation adjustments	(531)	62
Transfers and others	4	88
Balance at end of period	8,303	8,947
Disclosure of finance lease and operating lease by lessee [Line Items]
Lease liabilities	8,303	8,947
Cumulative Effect, Period of Adoption, Adjustment
Movement of Lease Liabilities [Roll Forward]
Balance at beginning of period	€ 4
Balance at end of period		4
Disclosure of finance lease and operating lease by lessee [Line Items]
Lease liabilities		€ 4

X

- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	duration

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 2024-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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X

- Definition

Accrued Interests of Lease Liabilities

+ References

No definition available.

+ Details

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X

- Definition

Additions to Lease Liabilities

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Disposals of Lease Liabilities

+ References

No definition available.

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X

- Definition

Movement of Lease Liabilities [Roll Forward]

+ References

No definition available.

+ Details

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X

- Definition

Principal Payments on Leases

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Principal and Interest Payments of Lease Liabilities

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Registration Of Companies, Lease Liabilities

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No definition available.

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- Definition

Transfers and Others of Lease Liabilities

+ References

No definition available.

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- Definition

Translation Differences And Inflation Adjustments of Lease Liabilities

+ References

No definition available.

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