XML 325 R162.htm IDEA: XBRL DOCUMENT
v3.20.1

Financial Risks - Summary of Composition of Shares by Industry Sector in Unrealized Loss Position (Detail) - Aegon US, NL [member] - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of impairment losses on shares [line items] |  |
Carrying value of instruments with unrealized losses | € 58 | € 86
Unrealized losses | (24) | (20)
Financial Industry [member] |  |
Disclosure of impairment losses on shares [line items] |  |
Carrying value of instruments with unrealized losses | 28 | 49
Unrealized losses | (10) | (15)
Other industry [member] |  |
Disclosure of impairment losses on shares [line items] |  |
Carrying value of instruments with unrealized losses | 30 | 37
Unrealized losses | € (14) | € (6)

X
- Definition Disclosure of impairment losses on shares. + References No definition available. + Details
Name: | aeg_DisclosureOfImpairmentLossesOnSharesLineItems
Namespace Prefix: | aeg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross unrealized loss. + References No definition available. + Details
Name: | aeg_GrossUnrealizedLoss
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross unrealized loss carrying value. + References No definition available. + Details
Name: | aeg_GrossUnrealizedLossCarryingValue
Namespace Prefix: | aeg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=aeg_AegonAmericasNetherlandsAndUkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=aeg_FinancialIndustryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=aeg_OtherIndustryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |