Fair Value - Summary of Carrying Amounts of Financial Assets and Financial Liabilities that are Classified as at Fair Value Through Profit or Loss (Detail) - EUR (€) € in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial assets at fair value through profit or loss [member]
Disclosure of fair value financial assets and liabilities [line items]
Trading	€ 2,475	€ 8,431
Designated	184,089	258,830
Financial liabilities at fair value through profit or loss, category [member]
Disclosure of fair value financial assets and liabilities [line items]
Trading	4,877	9,617
Designated	55,254	71,242
Investment contracts for account of policyholders [member] \| Financial assets at fair value through profit or loss [member]
Disclosure of fair value financial assets and liabilities [line items]
Trading	0
Designated	179,563	250,390
Investment contracts for account of policyholders [member] \| Financial liabilities at fair value through profit or loss, category [member]
Disclosure of fair value financial assets and liabilities [line items]
Trading	0
Designated	55,254	71,242
Derivatives with negative values not designated as hedges [member] \| Financial assets at fair value through profit or loss [member]
Disclosure of fair value financial assets and liabilities [line items]
Trading	2,434	8,390
Designated	0
Derivatives with negative values not designated as hedges [member] \| Financial liabilities at fair value through profit or loss, category [member]
Disclosure of fair value financial assets and liabilities [line items]
Trading	4,877	9,617
Investment income related to general account [member] \| Financial assets at fair value through profit or loss [member]
Disclosure of fair value financial assets and liabilities [line items]
Trading	41	41
Designated	€ 4,527	€ 8,440

Disclosure of fair value financial assets and liabilities.

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- Definition

The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 55
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-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 8
-Subparagraph a
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-URIDate 2022-03-24

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- Definition

The amount of financial assets at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: At fair value [member]; Financial assets at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 8
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_a&doctype=Standard
-URIDate 2022-03-24

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- Definition

The amount of financial liabilities at fair value through profit or loss that meet the definition of held for trading. A financial liability is classified as held for trading if: (a) it is acquired or incurred principally for the purpose of selling or repurchasing it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: Financial liabilities at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 8
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_e&doctype=Standard
-URIDate 2022-03-24

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- Definition

The amount of financial liabilities at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: At fair value [member]; Financial liabilities at fair value through profit or loss]

+ References

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