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Derivatives - Derivatives Not Designated In Hedge - General Account (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
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Disclosure of derivative financial instruments [Line Items] |  |  |  |
Derivative assets, general account | € 11,157 | € 7,615 | [1] | € 5,912
Derivative liability, general account | 11,616 | 7,230 | [1] | € 7,130
Derivatives for general account [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Derivative assets, general account | 10,658 | 7,337 |  |
Derivative liability, general account | 11,501 | 7,174 |  |
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Derivative assets, general account | 10,134 | 6,904 |  |
Derivative liability, general account | 11,060 | 6,879 |  |
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member] | Derivatives held as an economic hedge [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Derivative assets, general account | 10,118 | 6,808 |  |
Derivative liability, general account | 7,854 | 4,278 |  |
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member] | Bifurcated embedded derivatives [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Derivative assets, general account | 16 | 5 |  |
Derivative liability, general account | 3,197 | 2,588 |  |
Derivatives with negative values not designated as hedges [member] | Derivatives for general account [member] | Other [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Derivative assets, general account |  | 91 |  |
Derivative liability, general account | € 9 | € 12 |  |
[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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