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Guarantees in Insurance Contracts - Summary of Liabilities for Guarantees for Minimum Benefits (Detail) € in Millions, Unit_pure in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Jan. 01, 2018 EUR (€) | [1]
Liabilities under insurance contracts and reinsurance contracts issued [line items] |  |  |  |  |
Beginning balance | [1] | € 115,328 |  |  |
Ending balance |  | 123,454 | € 115,328 | [1] |
Account value |  | 135,710 | 117,113 | [1] | € 122,168
Net amount at risk |  | 226,374 | 194,353 | [1] | € 194,063
United States [member] | Life contingent guarantees [member] |  |  |  |  |
Liabilities under insurance contracts and reinsurance contracts issued [line items] |  |  |  |  |
Beginning balance |  | 1,425 | 972 |  |
Incurred guarantee benefits |  | (238) | 479 |  |
Paid guarantee benefits |  | (81) | (88) |  |
Net exchange differences |  | 27 | 62 |  |
Ending balance |  | 1,133 | 1,425 |  |
United States [member] | Life contingent guarantees [member] | Guaranteed Minimum Death Benefit 1 [member] |  |  |  |  |
Liabilities under insurance contracts and reinsurance contracts issued [line items] |  |  |  |  |
Beginning balance |  | 519 | 364 |  |
Incurred guarantee benefits |  | (27) | 197 |  |
Paid guarantee benefits |  | (53) | (65) |  |
Net exchange differences |  | 10 | 23 |  |
Ending balance |  | 448 | 519 |  |
Account value |  | 54,411 | 48,174 |  |
Net amount at risk |  | € 1,268 | € 2,839 |  |
Average attained age of contract holders |  | 70 | 70 |  |
United States [member] | Life contingent guarantees [member] | Guaranteed Minimum Income Benefit [member] |  |  |  |  |
Liabilities under insurance contracts and reinsurance contracts issued [line items] |  |  |  |  |
Beginning balance |  | € 906 | € 608 |  |
Incurred guarantee benefits |  | (210) | 282 |  |
Paid guarantee benefits |  | (27) | (23) |  |
Net exchange differences |  | 17 | 39 |  |
Ending balance |  | 686 | 906 |  |
Account value |  | 5,331 | 4,770 |  |
Net amount at risk |  | € 688 | € 888 |  |
Average attained age of contract holders |  | 71 | 71 |  |
[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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