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Financial Risks - Summary of Composition by Industry Category of Available-for-Sale (AFS) Debt Securities, Money Market Investments and Other in an Unrealized Loss Position (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | € 5,803 | € 28,943
Unrealized losses | (345) | (1,550)
Residential mortgage- backed securities [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 413 | 446
Unrealized losses | (18) | (30)
Commercial mortgage- backed securities (CMBSs) [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 494 | 2,012
Unrealized losses | (6) | (45)
Asset backed securities [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 662 | 2,088
Unrealized losses | (5) | (42)
ABSs - other [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 242 | 829
Unrealized losses | (4) | (10)
Financial Industry - Banking [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 349 | 2,522
Unrealized losses | (20) | (106)
Financial Industry - Insurance [Member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 104 | 646
Unrealized losses | (5) | (36)
Financial Industry - Other [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 615 | 1,523
Unrealized losses | (15) | (69)
Industrial [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 1,293 | 10,073
Unrealized losses | (105) | (684)
Utility [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 249 | 1,258
Unrealized losses | (10) | (78)
Government Securities [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 453 | 2,935
Unrealized losses | (23) | (164)
Other securities [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 279 | 194
Unrealized losses | (117) | (88)
Held by Aegon Americas and NL [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 5,153 | 24,528
Unrealized losses | (327) | (1,352)
Held by other segments [member] |  |
Disclosure of unrealized losses - debt securities, money market investments and other [line items] |  |
Carrying value of instruments with unrealized losses | 650 | 4,415
Unrealized losses | € (18) | € (197)

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