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Deferred Expenses - Summary of Deferred Costs Arising From Insurance Contracts (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items] |  |  |  |
Beginning balance | [1] | € 115,328 |  |
Ending balance |  | 123,454 | € 115,328 | [1]
DPAC [member] |  |  |  |
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items] |  |  |  |
Beginning balance |  | 10,457 | 9,688 |
Costs deferred during the year |  | 807 | 802 |
Amortization through income statement |  | (754) | (914) |
Shadow accounting adjustments |  | (656) | 455 |
Impairments |  | (65) |  |
Net exchange differences |  | 223 | 433 |
Disposal of group assets |  | (35) |  |
Other |  | (5) | (7) |
Ending balance |  | 9,972 | 10,457 |
Deferred costs of reinsurance [member] |  |  |  |
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items] |  |  |  |
Beginning balance |  | 23 | 41 |
Costs deferred during the year |  |  |  |
Amortization through income statement |  | 17 | (19) |
Shadow accounting adjustments |  |  |  |
Net exchange differences |  |  | 1 |
Ending balance |  | 389 | 23 |
Deferred transaction costs [member] |  |  |  |
Disclosure of deferred acquisition costs arising from insurance contracts [Line Items] |  |  |  |
Beginning balance |  | 431 | 406 |
Costs deferred during the year |  | 24 | 29 |
Amortization through income statement |  | (22) | (23) |
Net exchange differences |  | 9 | 18 |
Ending balance |  | € 442 | € 431 |
[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 costs. + References No definition available. + Details
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- Definition Deferred insurance liability disposal of group of assets. + References No definition available. + Details
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- Definition Disclosure Of Deferred Acquisition Costs Arising From Insurance Contracts [line items] + References No definition available. + Details
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- Definition Impairment of deferred cost. + References No definition available. + Details
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- Definition Net exchange differences deferred costs arising from insurance contracts. + References No definition available. + Details
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- Definition Other deferred costs arising from insurance contracts. + References No definition available. + Details
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- Definition Shadow accounting adjustments. + References No definition available. + Details
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