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Significant Accounting Policies - Summary of Change in Fair Value (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | € 148,570 | € 139,834
Change in fair value during the reporting period | 6,598 | (4,525)
Solely payments of principal and interest [member] | Share [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 70 | 68
Change in fair value during the reporting period | 1 | (2)
Solely payments of principal and interest [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 82,014 | 76,283
Change in fair value during the reporting period | 6,218 | (2,997)
Solely payments of principal and interest [member] | Money Markets and other short-term investment [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 2,724 | 3,126
Solely payments of principal and interest [member] | Mortgage loans - carried at amortized cost [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 42,567 | 39,758
Change in fair value during the reporting period | 930 | (1,213)
Solely payments of principal and interest [member] | Private loans - held at amortized cost [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 5,152 | 4,452
Change in fair value during the reporting period | 284 | (63)
Solely payments of principal and interest [member] | Deposits with financial institutions [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 142 | 141
Solely payments of principal and interest [member] | Other financial asset [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 36 | 111
Financial assets other than SPPI [member] | Share [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 810 | 2,092
Change in fair value during the reporting period | 54 | 87
Financial assets other than SPPI [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 4,839 | 4,970
Change in fair value during the reporting period | (770) | (123)
Financial assets other than SPPI [member] | Money Markets and other short-term investment [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 2,603 | 3,181
Financial assets other than SPPI [member] | Private loans - held at amortized cost [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 200 | 42
Change in fair value during the reporting period | (18) | (5)
Financial assets other than SPPI [member] | Policy loans [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 2,024 | 1,973
Financial assets other than SPPI [member] | Other financial asset [member] |  |
Disclosure of financial assets [line items] |  |
Fair value at the end of the reporting period | 5,388 | 3,637
Change in fair value during the reporting period | € (100) | € (210)

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