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Shareholders' Equity - Summary of Revaluation Reserves (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reserve of gains and losses on remeasuring available-for-sale financial assets [member] |  |  |
Disclosure of revaluation reserve [Line Items] |  |  |
Beginning balance | € 1,910 | € 3,427 | € 3,326
Gross revaluation | 3,470 | (2,142) | 1,403
Net (gains) / losses transferred to income statement | (412) | 66 | (1,330)
Foreign currency translation differences | 8 | 46 | (228)
Tax effect | (630) | 514 | 285
Other |  |  | (28)
Ending balance | 4,348 | 1,910 | 3,427
Reserve of cash flow hedges [member] |  |  |
Disclosure of revaluation reserve [Line Items] |  |  |
Beginning balance | 1,479 | 1,402 | 1,904
Gross revaluation | 89 | 85 | (115)
Net (gains) / losses transferred to income statement | (97) | (80) | (738)
Foreign currency translation differences | 27 | 71 | (216)
Tax effect | 3 | 1 | 567
Other |  |  | 1
Ending balance | 1,502 | 1,479 | 1,402
Revaluation account [member] |  |  |
Disclosure of revaluation reserve [Line Items] |  |  |
Beginning balance | 3,436 | 4,898 | 5,289
Gross revaluation | 3,556 | (2,090) | 1,296
Net (gains) / losses transferred to income statement | (509) | (14) | (2,069)
Net (gains) / losses transferred to retained earnings | (32) |  |
Foreign currency translation differences | 37 | 119 | (452)
Tax effect | (619) | 522 | 860
Other |  | 1 | (27)
Ending balance | 5,868 | 3,436 | 4,898
Real estate held for own use [member] |  |  |
Disclosure of revaluation reserve [Line Items] |  |  |
Beginning balance | 46 | 68 | 59
Gross revaluation | (4) | (32) | 8
Net (gains) / losses transferred to retained earnings | (32) |  |
Foreign currency translation differences | 1 | 2 | (8)
Tax effect | 8 | 7 | 9
Ending balance | € 19 | € 46 | € 68

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- Definition Change in other reserves. + References No definition available. + Details
Name: | aeg_ChangeInOtherReserves
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure Of Revaluation Reserve [line items]. + References No definition available. + Details
Name: | aeg_DisclosureOfRevaluationReserveLineItems
Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gains losses transferred to the income statement. + References No definition available. + Details
Name: | aeg_GainsLossesTransferredToTheIncomeStatement
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gains losses transferred to the retained earnings. + References No definition available. + Details
Name: | aeg_GainsLossesTransferredToTheRetainedEarnings
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other reserve of tax effect. + References No definition available. + Details
Name: | aeg_OtherReserveOfTaxEffect
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reserve + References No definition available. + Details
Name: | aeg_Reserve
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revaluation reserves gross. + References No definition available. + Details
Name: | aeg_RevaluationReservesGross
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A component of equity representing exchange differences on translation of financial statements of foreign operations recognised in other comprehensive income and accumulated in equity. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2019-01-01 -Paragraph 52 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2019-en-r&anchor=para_52_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_ReserveOfExchangeDifferencesOnTranslation
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_ReserveOfCashFlowHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_RevaluationSurplusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=aeg_RealEstateHeldForOwnUseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |