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Derivatives - Summary of Derivative Asset and Liability (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] |  |  |  |
Total derivative assets | € 11,157 | € 7,615 | [1] | € 5,912
Total derivative liabilities | 11,616 | 7,230 | [1] | € 7,130
Derivatives for general account [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Total derivative assets | 10,658 | 7,337 |  |
Total derivative liabilities | 11,501 | 7,174 |  |
Derivatives for general account [member] | Derivatives with negative values not designated as hedges [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Total derivative assets | 10,134 | 6,904 |  |
Total derivative liabilities | 11,060 | 6,879 |  |
Derivatives for general account [member] | Non-cash changes [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Total derivative assets | 21 | 30 |  |
Total derivative liabilities | 26 | 29 |  |
Derivatives for general account [member] | Cash flow hedges [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Total derivative assets | 390 | 289 |  |
Total derivative liabilities | 320 | 151 |  |
Derivatives for general account [member] | Derivatives designated as Net foreign investment hedges [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Total derivative assets | 112 | 115 |  |
Total derivative liabilities | 96 | 114 |  |
Derivatives for account of policyholders [member] | Derivatives with negative values not designated as hedges [member] |  |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |  |
Total derivative assets | 499 | 278 |  |
Total derivative liabilities | € 114 | € 56 |  |
[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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