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Equity - Share of equity method investments additional information (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of equity [Line Items]
Share of associates, joint ventures and other reserves includes non-distributable profits from associates and joint ventures	€ 815	€ 797	€ 738
Legal and statutory reserves
Disclosure of equity [Line Items]
Increase (decrease) in equity	(998)
Share of associates, joint ventures and other reserves
Disclosure of equity [Line Items]
Transfer to/from retained earnings	(892)	26	(21)
Software and other intangible assets
Disclosure of equity [Line Items]
Legal reserve	628	540	573
Stichting Regio Bank and Stichting Vakbondsspaarbank SPN
Disclosure of equity [Line Items]
Legal and statutory reserves	€ 1,602	€ 2,264	€ 2,103

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

Changes in transfer to or from retained earnings.

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- Definition

Legal Reserve

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- Definition

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

+ References

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