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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, 2019 | Dec. 31, 2018
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Financial assets at fair value through profit or loss [member] |  |
Disclosure of fair value financial assets and liabilities [line items] |  |
Trading | € 10,910 | € 7,355
Designated | 234,591 | 202,165
Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of fair value financial assets and liabilities [line items] |  |
Trading | 11,175 | 6,935
Designated | 60,417 | 50,383
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] |  |
Designated | 225,788 | 193,741
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] |  |
Designated | 59,956 | 49,847
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 | 10,634 | 7,181
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 | 11,175 | 6,935
Borrowings [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of fair value financial assets and liabilities [line items] |  |
Designated | 461 | 536
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 | 277 | 174
Designated | € 8,803 | € 8,424

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_a&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 8 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_e&doctype=Standard -URIDate 2019-03-27 + Details
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