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Deferred Tax - Summary of Deferred Tax (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1] | Dec. 31, 2017
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Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | € 193 | € 125 |  |  |
Deferred tax liabilities, temporary differences | 1,227 | 529 |  |  |
Deferred tax assets | 193 | 125 | [1] | € 79 |
Deferred tax liabilities | 1,227 | 529 | [1] | € 1,021 |
Total net deferred tax liability / (asset) | 1,035 | 394 |  |  | € 942
Real estate [member] |  |  |  |  |
Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | (520) |  |  |  |
Deferred tax liabilities, temporary differences | 124 | 520 |  |  |
Total net deferred tax liability / (asset) | 644 | 519 |  |  | 554
Financial assets [member] |  |  |  |  |
Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | 76 | (7) |  |  |
Deferred tax liabilities, temporary differences | 1,549 | 807 |  |  |
Total net deferred tax liability / (asset) | 1,473 | 814 |  |  | 1,737
Insurance and investment contracts [member] |  |  |  |  |
Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | 440 |  |  |  |
Deferred tax liabilities, temporary differences | (1,031) | (1,433) |  |  |
Total net deferred tax liability / (asset) | (1,471) | (1,434) |  |  | (1,787)
Deferred expenses, VOBA and other intangible assets [member] |  |  |  |  |
Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | (112) | (125) |  |  |
Deferred tax liabilities, temporary differences | 1,663 | 1,788 |  |  |
Total net deferred tax liability / (asset) | 1,775 | 1,914 |  |  | 1,892
Defined benefit plans [member] |  |  |  |  |
Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | 7 | 12 |  |  |
Deferred tax liabilities, temporary differences | (249) | (257) |  |  |
Total net deferred tax liability / (asset) | (256) | (269) |  |  | (295)
Tax losses and credits carried forward [member] |  |  |  |  |
Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | 183 | 167 |  |  |
Deferred tax liabilities, temporary differences | (551) | (147) |  |  |
Other [member] |  |  |  |  |
Deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets, temporary differences | 119 | 79 |  |  |
Deferred tax liabilities, temporary differences | (279) | (748) |  |  |
Total net deferred tax liability / (asset) | € (398) | € (827) |  |  | € (863)
[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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