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Investment and return - Narrative (Details) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of cash and cash equivalents [line items]
Cash and cash equivalents held by central finance companies	€ 900
Percentage of cash and cash equivalents held by central finance companies	21.00%
Cash and cash equivalents held with foreign subsidiaries	€ 3,300
Percentage of cash and cash equivalents held with foreign subsidiaries	79.00%
Cash and cash equivalents held by entity unavailable for use by group	€ 98	€ 449
Collateral held permitted to be sold or repledged in absence of default by owner of collateral, at fair value	6	97
Cash
Disclosure of cash and cash equivalents [line items]
Collateral held permitted to be sold or repledged in absence of default by owner of collateral, at fair value	6	81
Bond Securities
Disclosure of cash and cash equivalents [line items]
Collateral held permitted to be sold or repledged in absence of default by owner of collateral, at fair value	€ 0	€ 16

X

- Definition

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 15
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_15_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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X

- Definition

The amount of significant cash and cash equivalent balances held by the entity that are not available for use by the group. [Refer: Cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Paragraph 48
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_48&doctype=Standard
-URIDate 2023-03-23

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X

- Definition

Cash and cash equivalents held by central finance companies.

+ References

No definition available.

+ Details

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- Definition

Cash and cash equivalents held by central finance companies percentage.

+ References

No definition available.

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- Definition

Cash and cash equivalents held by foreign subsidiaries.

+ References

No definition available.

+ Details

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- Definition

Cash and cash equivalents held by foreign subsidiaries percentage.

+ References

No definition available.

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- Definition

Line items represents cash and cash equivalents.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:
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- Details

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