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Financial Risks - Summary of Financial Liabilities Relating to Insurance and Investment Contracts (Detail) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018 | [1]
Financial liabilities relating to insurance and investment contracts [line items] |  |  |  |  |
Insurance contracts | € 123,454 | € 115,328 | [1] |  | € 110,848
Total of financial liabilities | 3,532 | 3,740 |  | € 4,288 |
Liquidity risk [member] |  |  |  |  |
Financial liabilities relating to insurance and investment contracts [line items] |  |  |  |  |
Insurance contracts | 151,216 | 166,807 |  |  |
Insurance contracts for account of policyholders | 213,318 | 210,550 |  |  |
Investment contracts | 21,544 | 21,490 |  |  |
Investment contracts for account of policyholders | 151,527 | 125,125 |  |  |
Total of financial liabilities | 537,605 | 523,972 |  |  |
Liquidity risk [member] | On demand [member] |  |  |  |  |
Financial liabilities relating to insurance and investment contracts [line items] |  |  |  |  |
Investment contracts for account of policyholders | 181 | 169 |  |  |
Total of financial liabilities | 181 | 169 |  |  |
Liquidity risk [member] | Not later than 1 year [member] |  |  |  |  |
Financial liabilities relating to insurance and investment contracts [line items] |  |  |  |  |
Insurance contracts | 3,500 | 5,255 |  |  |
Insurance contracts for account of policyholders | 9,666 | 8,382 |  |  |
Investment contracts | 8,857 | 6,679 |  |  |
Investment contracts for account of policyholders | 10,311 | 8,839 |  |  |
Total of financial liabilities | 32,335 | 29,155 |  |  |
Liquidity risk [member] | 1-5 years [member] |  |  |  |  |
Financial liabilities relating to insurance and investment contracts [line items] |  |  |  |  |
Insurance contracts | 13,003 | 17,147 |  |  |
Insurance contracts for account of policyholders | 36,782 | 35,238 |  |  |
Investment contracts | 5,837 | 6,985 |  |  |
Investment contracts for account of policyholders | 28,244 | 23,185 |  |  |
Total of financial liabilities | 83,868 | 82,556 |  |  |
Liquidity risk [member] | Over 5 through 10 years [member] |  |  |  |  |
Financial liabilities relating to insurance and investment contracts [line items] |  |  |  |  |
Insurance contracts | 15,668 | 17,891 |  |  |
Insurance contracts for account of policyholders | 36,571 | 36,455 |  |  |
Investment contracts | 2,503 | 2,739 |  |  |
Investment contracts for account of policyholders | 31,766 | 28,747 |  |  |
Total of financial liabilities | 86,508 | 85,831 |  |  |
Liquidity risk [member] | Over 10 years [member] |  |  |  |  |
Financial liabilities relating to insurance and investment contracts [line items] |  |  |  |  |
Insurance contracts | 119,044 | 126,514 |  |  |
Insurance contracts for account of policyholders | 130,299 | 130,475 |  |  |
Investment contracts | 4,347 | 5,087 |  |  |
Investment contracts for account of policyholders | 81,024 | 64,185 |  |  |
Total of financial liabilities | € 334,714 | € 326,261 |  |  |
[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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