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Guarantees in Insurance Contracts - Summary of Liabilities for Guarantees That are Included in Valuation of Host Contracts, Net of Present Value of Expected Future Premiums (Detail) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
Liabilities under insurance contracts and reinsurance contracts issued [line items] |  |  |  |  |
Beginning balance | [1] | € 115,328 |  |  |
Ending balance |  | 123,454 | € 115,328 | [1] |
Net amount at risk |  | 226,374 | 194,353 | [1] | € 194,063
The Netherlands [member] |  |  |  |  |
Liabilities under insurance contracts and reinsurance contracts issued [line items] |  |  |  |  |
Beginning balance |  | 34,878 |  |  |
Ending balance |  | 40,554 | 34,878 |  |
Net amount at risk |  | 25,491 | 23,767 |  |
The Netherlands [member] | Guaranteed Minimum Investment [member] |  |  |  |  |
Liabilities under insurance contracts and reinsurance contracts issued [line items] |  |  |  |  |
Beginning balance |  | 5,063 | 4,719 |  |
Incurred guarantee benefits |  | 1,358 | 344 |  |
Ending balance |  | 6,422 | 5,063 |  |
Account value |  | 19,985 | 18,346 |  |
Net amount at risk |  | € 6,335 | € 4,933 |  |
[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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