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Investments in Joint Ventures and Associates - Schedule of Financial Information of Associates (Detail) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018 | [1]
Disclosure of associates [Line Items] |  |  |  |  |  |
Net income/(loss) | € 1,239 | € 711 | [1] | € 2,469 | [1] |
Other comprehensive income | 2,232 | (1,107) | [1] | (1,968) | [1] |
Total comprehensive income | 3,471 | (396) | [1] | 501 | [1] |
Carrying amount | 363 | 327 | [1] | € 308 |  | € 308
Aegon [member] |  |  |  |  |  |
Disclosure of associates [Line Items] |  |  |  |  |  |
Net income/(loss) | 7 | 6 |  |  |  |
Other comprehensive income | (7) | 2 |  |  |  |
Total comprehensive income |  | 9 |  |  |  |
Carrying amount | € 350 | € 327 |  |  |  |
[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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