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Subordinated Borrowings - Summary of Subordinated Borrowings (Parenthetical) (Detail) € in Millions, $ in Millions | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Oct. 22, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Apr. 11, 2018 USD ($)
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USD 800 million fixed floating subordinated notes [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Fixed floating subordinated notes |  | $ 800 |  |  |  | $ 800
USD 800 million fixed floating subordinated notes [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Fixed floating subordinated notes |  | 800 |  |  | $ 800 | $ 800
EUR 700 million fixed floating subordinated notes [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Fixed floating subordinated notes | € | € 700 |  |  |  |  |
EUR 700 million fixed floating subordinated notes [member] | Aegon N.V [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Fixed floating subordinated notes | € | € 700 |  |  | € 700 |  |
USD 925 million fixed subordinated notes [member] |  |  |  |  |  |
Disclosure of subordinated liabilities [Line Items] |  |  |  |  |  |
Fixed floating subordinated notes |  | $ 925 | $ 925 |  | $ 925 |

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