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Accruals - Summary of Accruals (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
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Subclassifications of assets, liabilities and equities [abstract] |  |  |  |
Accrued interest | € 292 | € 237 |  |
Accrued expenses | 134 | 151 |  |
At December 31 | € 426 | € 388 | [1] | € 329
[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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