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Borrowings - Summary of Detailed Composition of Capital Funding (Detail) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Borrowings | € 9,307 | € 12,061 | [1] | € 13,635
Capital funding [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Borrowings | € 1,745 | 1,774 |  |
Capital funding [member] | EUR 500 million unsecured notes [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Coupon date | August 30 |  |  |
Borrowings issued year | 2017 |  |  |
Capital funding [member] | EUR 75 Million Medium-Term Notes [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Coupon rate | 4.625% |  |  |
Coupon date | December 9 |  |  |
Borrowings issued year | 2004 |  |  |
Borrowings maturity year | 2019 |  |  |
Borrowings |  | 78 |  |
Capital funding [member] | USD 500 Million Senior Notes [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Coupon rate | 5.75% |  |  |
Coupon date | Semi-annually |  |  |
Borrowings issued year | 2005 |  |  |
Borrowings maturity year | 2020 |  |  |
Borrowings | € 461 | 457 |  |
Capital funding [member] | EUR 500 Million Senior Unsecured Notes [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Coupon rate | 1.00% |  |  |
Coupon date | December 8 |  |  |
Borrowings issued year | 2016 |  |  |
Borrowings maturity year | 2023 |  |  |
Borrowings | € 497 | 496 |  |
Capital funding [member] | GBP 250 Million Medium-Term Notes [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Coupon rate | 6.125% |  |  |
Coupon date | December 15 |  |  |
Borrowings issued year | 1999 |  |  |
Borrowings maturity year | 2031 |  |  |
Borrowings | € 293 | 277 |  |
Capital funding [member] | GBP 400 Million Senior Unsecured Notes [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Coupon rate | 6.625% |  |  |
Coupon date | Semi-annually |  |  |
Borrowings issued year | 2009 |  |  |
Borrowings maturity year | 2039 |  |  |
Borrowings | € 467 | 440 |  |
Capital funding [member] | Other [member] |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |
Borrowings | € 26 | € 26 |  |
[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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