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Investments for Account of Policyholders - Summary of Investments for Account of Policyholders (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
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Disclosure of investments for account of policyholders [Line Items] |  |  |  |
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives | € 225,788 | € 193,741 |  |
Investments in real estate | 586 | 612 |  |
Total investments for account of policyholders | 226,374 | 194,353 | [1] | € 194,063
Investment in shares [member] |  |  |  |
Disclosure of investments for account of policyholders [Line Items] |  |  |  |
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives | 25,288 | 20,640 |  |
Investment in debt securities [member] |  |  |  |
Disclosure of investments for account of policyholders [Line Items] |  |  |  |
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives | 20,744 | 20,441 |  |
Money market and other short-term investments - carried at fair value [member] |  |  |  |
Disclosure of investments for account of policyholders [Line Items] |  |  |  |
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives | 1,805 | 1,578 |  |
Deposits with financial institutions [member] |  |  |  |
Disclosure of investments for account of policyholders [Line Items] |  |  |  |
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives | 3,278 | 3,263 |  |
Investment in unconsolidated investment funds [member] |  |  |  |
Disclosure of investments for account of policyholders [Line Items] |  |  |  |
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives | 170,039 | 143,800 |  |
Other investments [member] |  |  |  |
Disclosure of investments for account of policyholders [Line Items] |  |  |  |
Total investments for account of policyholders at fair value through profit or loss, excluding derivatives | € 4,634 | € 4,020 |  |
[1] | Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.

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