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Commissions and Expenses - Summary of Commissions and Expenses (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of commissions and expenses [line items] |  |  |
Commissions | € 2,423 | € 2,445 | € 2,661
Employee expenses | 2,149 | 2,061 | 2,234
Administration expenses | 1,537 | 1,477 | 1,424
Deferred expenses | (832) | (831) | (980)
Amortization of deferred expenses | 755 | 928 | 543
Amortization of VOBA and future servicing rights | 120 | 144 | 43
Total | 6,153 | 6,224 | € 5,925
Aegon N.V [member] |  |  |
Disclosure of commissions and expenses [line items] |  |  |
Employee expenses | 88 | 83 |
Administration expenses | 77 | 79 |
Cost sharing to group companies | (91) | (80) |
Total | € 74 | € 82 |

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