Other assets - Schedule of other assets (Details) - EUR (€) € in Millions	Dec. 31, 2024	Dec. 31, 2023
Other assets [abstract]
Net defined benefit assets	€ 568	€ 554
Investment properties	19	14
Property development and obtained from foreclosures	18	32
Prepayments	413	438
Accrued assets	499	523
Amounts to be settled	3,550	3,869
Other	1,879	1,687
Other assets total	€ 6,945	€ 7,117

The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

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

- Definition

The amount of items that have been transmitted from other banks but not yet been received and processed by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
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- Definition

The amount of assets that the entity does not separately disclose in the same statement or note.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables that represent amounts paid for goods and services before they have been delivered.

+ References

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- Definition

The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

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- Definition

The amount of assets accrued as part of the total other assets

+ References

No definition available.

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- References

No definition available.

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- Definition

Miscellaneous other assets.

+ References

No definition available.

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- Definition

The amount transferred from investment property under construction or development and foreclosures to completed investment property.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant