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Off balance sheet commitments - Summary of Amount of Guarantees Given and Received (Details) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Guarantees received
Disclosure of Guarantees [Line Items]
Estimated financial effect of contingent liabilities	€ 1,272	€ 1,229	€ 1,149
Guarantees given
Disclosure of Guarantees [Line Items]
Estimated financial effect of contingent liabilities	3,936	3,815	3,794
Guarantees provided to banks in connection with credit facilities
Disclosure of Guarantees [Line Items]
Estimated financial effect of contingent liabilities	1,067	1,007	1,042
Other guarantees given
Disclosure of Guarantees [Line Items]
Estimated financial effect of contingent liabilities	€ 2,869	€ 2,808	€ 2,752

X

- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2023-01-01
-Paragraph 86
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_86_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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X

- Definition

Disclosure of guarantees.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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