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Significant Accounting Policies - Summary of Credit Risk Exposure (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Financial assets at carrying value, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | € 35,056 | € 34,087
Financial assets at carrying value, class [member] | Shares - Carried at fair value [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 27 | 26
Financial assets at carrying value, class [member] | Debt securities - carried at fair value [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 3,894 | 4,035
Financial assets at carrying value, class [member] | Mortgage loans - carried at amortized cost [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 29,593 | 28,661
Financial assets at carrying value, class [member] | Private loans - held at amortized cost [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 1,431 | 1,189
Financial assets at carrying value, class [member] | Deposits with financial institutions [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 76 | 70
Financial assets at carrying value, class [member] | Other financial assets - carried at fair value [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 35 | 106
Financial assets at fair value, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 38,652 | 37,173
Financial assets at fair value, class [member] | Shares - Carried at fair value [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 27 | 26
Financial assets at fair value, class [member] | Debt securities - carried at fair value [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 3,894 | 4,035
Financial assets at fair value, class [member] | Mortgage loans - carried at amortized cost [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 33,132 | 31,711
Financial assets at fair value, class [member] | Private loans - held at amortized cost [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 1,488 | 1,225
Financial assets at fair value, class [member] | Deposits with financial institutions [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | 76 | 70
Financial assets at fair value, class [member] | Other financial assets - carried at fair value [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets with no low credit risk | € 35 | € 106

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