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Financial Risks - Summary of Breakdown of Quality of Available-for-Sale (AFS) ABS Portfolio (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total fair value | € 148,570 | € 139,834
Asset backed securities [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total fair value | 0 | 4,503
Aegon Americas and Netherlands [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total fair value | 3,332 | 4,503
Aegon Americas and Netherlands [member] | Asset backed securities [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 3,274 | 4,512
Total fair value | 3,332 | 4,503
Aegon Americas and Netherlands [member] | Asset backed securities [member] | Credit cards [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 67 | 193
Total fair value | 77 | 201
Aegon Americas and Netherlands [member] | Asset backed securities [member] | Autos [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 220 | 290
Total fair value | 222 | 289
Aegon Americas and Netherlands [member] | Asset backed securities [member] | Small business loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 21 | 60
Total fair value | 21 | 63
Aegon Americas and Netherlands [member] | Asset backed securities [member] | CDOs backed by ABS, Corp. bonds, Bank loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 1,567 | 2,423
Total fair value | 1,569 | 2,386
Aegon Americas and Netherlands [member] | Asset backed securities [member] | ABSs - other [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 1,400 | 1,547
Total fair value | 1,444 | 1,563
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AAA [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 1,843 | 2,464
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AAA [member] | Credit cards [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 66 | 174
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AAA [member] | Autos [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 147 | 230
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AAA [member] | CDOs backed by ABS, Corp. bonds, Bank loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 1,201 | 1,535
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AAA [member] | ABSs - other [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 429 | 525
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AA [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 329 | 649
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AA [member] | Credit cards [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 1 | 19
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AA [member] | CDOs backed by ABS, Corp. bonds, Bank loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 229 | 479
Aegon Americas and Netherlands [member] | Asset backed securities [member] | AA [member] | ABSs - other [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 98 | 151
Aegon Americas and Netherlands [member] | Asset backed securities [member] | A [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 878 | 1,051
Aegon Americas and Netherlands [member] | Asset backed securities [member] | A [member] | Autos [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 72 | 58
Aegon Americas and Netherlands [member] | Asset backed securities [member] | A [member] | Small business loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 2 | 2
Aegon Americas and Netherlands [member] | Asset backed securities [member] | A [member] | CDOs backed by ABS, Corp. bonds, Bank loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 45 | 216
Aegon Americas and Netherlands [member] | Asset backed securities [member] | A [member] | ABSs - other [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 760 | 774
Aegon Americas and Netherlands [member] | Asset backed securities [member] | BBB [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 154 | 248
Aegon Americas and Netherlands [member] | Asset backed securities [member] | BBB [member] | Autos [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 2 | 2
Aegon Americas and Netherlands [member] | Asset backed securities [member] | BBB [member] | Small business loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 6 | 12
Aegon Americas and Netherlands [member] | Asset backed securities [member] | BBB [member] | CDOs backed by ABS, Corp. bonds, Bank loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 42 | 146
Aegon Americas and Netherlands [member] | Asset backed securities [member] | BBB [member] | ABSs - other [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 104 | 88
Aegon Americas and Netherlands [member] | Asset backed securities [member] | Less than BBB [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 71 | 100
Aegon Americas and Netherlands [member] | Asset backed securities [member] | Less than BBB [member] | Small business loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 13 | 46
Aegon Americas and Netherlands [member] | Asset backed securities [member] | Less than BBB [member] | CDOs backed by ABS, Corp. bonds, Bank loans [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | 49 | 46
Aegon Americas and Netherlands [member] | Asset backed securities [member] | Less than BBB [member] | ABSs - other [member] |  |
Breakdown by quality of the available-for-sale (AFS) ABS portfolio [line items] |  |
Total amortized cost | € 9 | € 8

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