Commitments and Contingencies - Summary of Commitments through Purchase and Sale Transactions of Investments (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Real estate [member]
Disclosure of purchase and sale transactions of investments [line items]
Purchase		€ 129
Sale	€ 1	6
Mortgage loans [member]
Disclosure of purchase and sale transactions of investments [line items]
Purchase	468	1,163
Sale		67
Private loans [member]
Disclosure of purchase and sale transactions of investments [line items]
Purchase	150	311
Other [member]
Disclosure of purchase and sale transactions of investments [line items]
Purchase	€ 1,408	€ 1,358

Disclosure Of Purchase And Sale Transactions Of Investments [line items]

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- Definition

The cash inflow from sales of investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_16&doctype=Standard
-URIDate 2022-03-24

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- Definition

The cash outflow for the purchase of interests in investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

+ References

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