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Financial Risks - Summary of Credit Quality of USA's Available-For-Sale (AFS) CMBS Portfolio (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of financial assets [line items] |  |
Total fair value | € 9,080 | € 8,597
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 3,323 | 3,331
Total fair value | 3,427 | 3,314
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | CMBS [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 3,323 | 3,326
Total fair value | 3,427 | 3,310
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | CMBS and CRE CDOs [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost |  | 5
Total fair value |  | 4
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AAA [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 2,540 | 2,635
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AAA [member] | CMBS [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 2,540 | 2,635
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AA [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 639 | 567
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | AA [member] | CMBS [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 639 | 567
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 109 | 65
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | A [member] | CMBS [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 109 | 65
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | BBB [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 7 | 3
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | BBB [member] | CMBS [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 7 | 3
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | Less than BBB [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 29 | 62
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | Less than BBB [member] | CMBS [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | € 29 | 57
Aegon Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | Less than BBB [member] | CMBS and CRE CDOs [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost |  | € 5

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