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Accruals - Summary of Accruals (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
[1]
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.