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Investments in Joint Ventures and Associates - Summary of Overview of Summarized Financial Information to Carrying Amount of Joint Ventures (Detail) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1] | Dec. 31, 2017
Disclosure of joint ventures [Line Items] |  |  |  |  |
Carrying amount | € 1,983 | € 1,745 | [1] | € 1,712 | € 1,712
Amvest [member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Net assets of joint venture as presented above | 3,602 | 2,848 |  |  |
Net assets of joint venture excluding goodwill | 3,602 | 2,848 |  |  |
Carrying amount | 1,159 | 1,001 |  |  |
Amvest [member] | Aegon [member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Net assets of joint venture excluding goodwill | 1,159 | 1,001 |  |  |
Other Joint ventures [member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Net assets of joint venture as presented above | 1,237 | 1,057 |  |  |
Net assets of joint venture excluding goodwill | 857 | 681 |  |  |
Goodwill on acquisition | 380 | 376 |  |  |
Carrying amount | 824 | 728 |  |  |
Other Joint ventures [member] | Aegon [member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Net assets of joint venture excluding goodwill | € 445 | € 352 |  |  |
[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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