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Borrowings - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Jan. 01, 2018 EUR (€) | [1]
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Borrowings | € 9,307 |  | € 12,061 | [1] | € 13,635
Borrowings at fair value | 9,783 |  | 12,421 |  |
Difference between the contractually required payment at maturity date and the carrying amount | 40 |  | (8) |  |
Operational funding [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Decrease in borrowing capacity | 2,700 |  | 1,100 |  |
Redemption of debt | 1,400 | $ 1,540 |  |  |
Borrowings | 7,562 |  | 10,287 |  |
Principal amount | € 500 |  |  |  |
Coupon rate | 0.625% |  |  |  |
FHLB advances [member] | Operational funding [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Decrease in borrowing capacity | € 1,700 |  | 700 |  |
Other [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Borrowings at fair value | 461 |  | 536 |  |
Negative credit spread on income before tax | 1 |  | (1) |  |
Negative credit spread on stockholder equity | 1 |  | (3) |  |
Cumulative negative credit spread on cumulative income before tax | 28 |  | 26 |  |
Other [member] | Operational funding [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Borrowings | 8 |  | 12 |  |
SAECURE 13" RMBS Note [member] | Operational funding [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Redemption of debt |  |  | 700 |  |
Other mortgages funding [member] | Operational funding [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Decrease in borrowing capacity | 500 |  | 500 |  |
SAECURE 16" RMBS Note [member] | Operational funding [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Borrowings | € 512 |  | € 875 |  |
Expected weighted average life | 4 years 9 months 18 days | 4 years 9 months 18 days | 4 years 1 month 6 days |  |
Coupon rate | 3 month Euribor plus 40bps. | 3 month Euribor plus 40bps. | 3 month Euribor plus 40bps |  |
Seacure14 [Member] | Operational funding [member] |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |
Redemption of debt | € 900 |  |  |  |
[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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