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Deferred Expenses - Summary of Amounts Arising From Insurance Contracts (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
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Disclosure of amounts arising from insurance contracts [abstract] |  |  |  |
DPAC for insurance contracts and investment contracts with discretionary participation features | € 9,972 | € 10,457 |  |
Deferred cost of reinsurance | 389 | 23 |  |
Deferred transaction costs for investment management services | 442 | 431 |  |
Deferred expenses | 10,804 | 10,910 | [1] | € 10,135
Current | 882 | 957 |  |
Non-current | € 9,921 | € 9,953 |  |
[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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- Definition Deferred cost of reinsurance. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred expenses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred expenses current. + References No definition available. + Details
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Balance Type: | debit
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- Definition Deferred expenses noncurrent. + References No definition available. + Details
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- Definition Deferred policy acquisition costs for insurance and investment contracts. + References No definition available. + Details
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- Definition Deferred transaction costs for investment management services. + References No definition available. + Details
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Balance Type: | debit
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- Definition Disclosure of amounts arising from insurance contracts. + References No definition available. + Details
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