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Capital Management and Solvency - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2019 USD ($) | Oct. 22, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Solvency contribution risk-based capital ratio | 150.00% | 150.00% |  |  |  |
Solvency contribution risk-based capital own fund ratio | 100.00% | 100.00% |  |  |  |
Withdrawal of insurance license triggered by breach of Authorized Control Level (ACL), percentage | 100.00% | 100.00% |  |  |  |
Withdrawal of insurance license triggered by breach of Company Action Level (CAL), percentage | 50.00% | 50.00% |  |  |  |
Percentage of higher capital requirement in SCR | 100.00% | 100.00% |  |  |  |
Percentage of tier 1 capital accounted for own funds | 83.00% | 83.00% | 89.00% |  |  |
Restricted of tier 2 capital | € 823 |  |  |  |  |
Solvency II revaluations related to items that are not recognized under Solvency | 1,932 |  | € 2,024 |  |  |
Solvency II revaluation related to the Net Asset Value of subsidiaries that are included under the Deduction & Aggregation method | € (5,663) |  | € (4,095) |  |  |
Total gross financial leverage | 28.50% |  | 29.20% | 28.50% |  | 29.20%
Fixed Charge Coverage | 7.7 |  | 8.2 | 7.7 |  | 8.2
Total distributable reserves | € 13,569 |  | € 13,307 |  |  |
Capital requirements on a solo-level, Solvency II ratio | 100.00% |  |  | 100.00% |  |
Perpetual Contingent Convetible Security Two Thousand And Nineteen [Member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Restricted of tier one capital | € 518 |  |  |  |  |
Debt instrument face value | 500 |  |  |  |  |
Repayment Of Perpetual Capital Securities | $ |  | $ 1,000 |  |  |  |
Aegons insurance group [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Solvency II revaluation related to items that have a different valuation treatment between IFRS and Solvency II | 3,360 |  | 2,789 |  |  |
IFRS and Solvency II frameworks [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Solvency II revaluations, total | (7,607) |  | (6,593) |  |  |
Fixed floating subordinated notes [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Restricted of tier 2 capital | 774 |  | 771 |  |  |
USD 925 million fixed subordinated notes [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Subordinated Notes Issued | $ |  |  |  | $ 925 | $ 925 | $ 925
Subordinated Liabilities [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Reclassification of subordinated liabilities | (3,372) |  | (3,262) |  |  |
Junior perpetual capital securities [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Restricted of tier one capital | 1,617 |  | 2,931 |  |  |
Perpetual cumulative subordinated bonds [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Restricted of tier one capital | € 479 |  | € 476 |  |  |
New method [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Percentage of tier 2 capital accounted for own funds | 13.00% | 13.00% | 8.00% |  |  |
Restricted of tier 2 capital | € 773 |  | € 716 |  |  |
Top of range [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Group solvency II ratio | 200.00% | 200.00% |  |  |  |
Capital instruments under solvency period | 10 years | 10 years |  |  |  |
Total gross financial leverage | 30.00% |  |  | 30.00% |  |
Fixed Charge Coverage | 0.08 |  |  | 0.08 |  |
Bottom of range [member] |  |  |  |  |  |
Disclosure of capital management and solvency [line items] |  |  |  |  |  |
Group solvency II ratio | 150.00% | 150.00% |  |  |  |
Total gross financial leverage | 26.00% |  |  | 26.00% |  |
Fixed Charge Coverage | 0.06 |  |  | 0.06 |  |
Capital requirements on a solo-level, Solvency II ratio | 100.00% |  |  | 100.00% |  |

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