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Equity - Share of equity method investments additional information (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of equity [Line Items]
– of which share of result from associates and joint ventures	€ 940	€ 815	€ 797
Legal and statutory reserves
Disclosure of equity [Line Items]
Unrealised revaluations	(830)	(998)	0
Share of associates, joint ventures and other reserves
Disclosure of equity [Line Items]
Transfer to/from retained earnings	(565)	(892)	26
Software and other intangible assets
Disclosure of equity [Line Items]
Legal reserve	768	628	540
Stichting Regio Bank and Stichting Vakbondsspaarbank SPN
Disclosure of equity [Line Items]
Statutory reserve	€ 897	€ 1,602	€ 2,264

X

- Definition

The increase (decrease) in equity. [Refer: Equity]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

A component of equity representing reserves created based on legal requirements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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- Definition

Legal Reserve

+ References

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X

- Definition

Share Of Associates, Joint Venture And Other Reserves Including Non-Distributable Profits From Associates and Joint Ventures

+ References

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