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Results From Financial Transactions - Summary of Net Fair Value Change on for Account of Policyholder Financial Assets at Fair Value Through Profit or Loss (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial instruments at fair value through profit or loss [line items] |  |  |
Net fair value changes of financial assets at fair value through profit or loss | € 33,188 | € (11,326) | € 20,524
Shares [member] |  |  |
Disclosure of financial instruments at fair value through profit or loss [line items] |  |  |
Net fair value changes of financial assets at fair value through profit or loss | 4,591 | (2,318) | 2,372
Debt securities and money market investments [member] |  |  |
Disclosure of financial instruments at fair value through profit or loss [line items] |  |  |
Net fair value changes of financial assets at fair value through profit or loss | 863 | (421) | 166
Unconsolidated investment funds [member] |  |  |
Disclosure of financial instruments at fair value through profit or loss [line items] |  |  |
Net fair value changes of financial assets at fair value through profit or loss | 26,450 | (8,158) | 17,720
Derivatives [member] |  |  |
Disclosure of financial instruments at fair value through profit or loss [line items] |  |  |
Net fair value changes of financial assets at fair value through profit or loss | € 1,284 | € (429) | € 265

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