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Fair Value - Analysis of Assets and Liabilities Recorded at Fair Value on Recurring Basis by Level of Fair Value Hierarchy (Detail) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018		Jan. 01, 2018	[1]	Dec. 31, 2017
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	€ 440,348	€ 392,633	[1]	€ 395,923
Liabilities carried at fair value	415,907	370,091	[1]	€ 371,844
Real estate held for own use [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	208	263
Level III [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	3,278	2,695				€ 2,064
Level III [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	10,722	10,077				9,130
Level III [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,712	1,976				2,318
Level III [member] | Debt securities [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,074	1,242				1,447
Level III [member] | Other investments [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	482	493				583
Level III [member] | Real estate held for own use [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	208	263				307
Level III [member] | Investment contracts for account of policyholders [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	197	206				219
Level III [member] | Derivative [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	3,081	2,489				€ 1,845
Investment funds [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	339,124	298,204
Liabilities carried at fair value	72,033	57,613
Investment funds [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	89,404	84,675
Investment funds [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	249,512	213,266
Investment funds [member] | Financial assets revalued amount [Member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	208	263
Investment funds [member] | Shares [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	409	478
Investment funds [member] | Shares [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,813	1,682
Investment funds [member] | Debt securities [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	82,918	77,340
Investment funds [member] | Debt securities [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	3,934	3,913
Investment funds [member] | Money market and other short-term instruments [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	5,169	5,955
Investment funds [member] | Money market and other short-term instruments [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	158	352
Investment funds [member] | Other investments [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	908	902
Investment funds [member] | Other investments [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	3,175	2,649
Investment funds [member] | Investment contracts for account of policyholders [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	225,788	193,741
Investment funds [member] | Derivatives [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	11,157	7,615
Investment funds [member] | Real estate [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	2,901	2,700
Investment funds [member] | Investments in real estate for policyholders [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	586	612
Investment funds [member] | Real estate held for own use [member] | Financial assets revalued amount [Member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	208	263
Investment funds [member] | Investment contracts for account of policyholders [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	59,956	49,847
Investment funds [member] | Borrowings [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	461	536
Investment funds [member] | Derivative [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	11,616	7,230
Investment funds [member] | Level I [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	147,571	132,294
Liabilities carried at fair value	59	93
Investment funds [member] | Level I [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	26,875	26,160
Investment funds [member] | Level I [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	120,696	106,134
Investment funds [member] | Level I [member] | Shares [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	92	82
Investment funds [member] | Level I [member] | Shares [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	106	217
Investment funds [member] | Level I [member] | Debt securities [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	25,528	24,652
Investment funds [member] | Level I [member] | Debt securities [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	204	1,868
Investment funds [member] | Level I [member] | Money market and other short-term instruments [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,255	1,427
Investment funds [member] | Level I [member] | Money market and other short-term instruments [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	19	17
Investment funds [member] | Level I [member] | Other investments [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1	1
Investment funds [member] | Level I [member] | Investment contracts for account of policyholders [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	120,271	103,977
Investment funds [member] | Level I [member] | Derivatives [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	96	53
Investment funds [member] | Level I [member] | Derivative [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	59	93
Investment funds [member] | Level II [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	180,831	155,833
Liabilities carried at fair value	68,696	54,824
Investment funds [member] | Level II [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	60,817	56,538
Investment funds [member] | Level II [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	120,014	99,295
Investment funds [member] | Level II [member] | Shares [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	160	155
Investment funds [member] | Level II [member] | Shares [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	306	239
Investment funds [member] | Level II [member] | Debt securities [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	56,317	51,446
Investment funds [member] | Level II [member] | Debt securities [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	3,727	2,028
Investment funds [member] | Level II [member] | Money market and other short-term instruments [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	3,914	4,528
Investment funds [member] | Level II [member] | Money market and other short-term instruments [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	139	335
Investment funds [member] | Level II [member] | Other investments [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	426	409
Investment funds [member] | Level II [member] | Other investments [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,125	1,272
Investment funds [member] | Level II [member] | Investment contracts for account of policyholders [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	103,712	87,893
Investment funds [member] | Level II [member] | Derivatives [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	11,006	7,527
Investment funds [member] | Level II [member] | Investment contracts for account of policyholders [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	59,759	49,641
Investment funds [member] | Level II [member] | Borrowings [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	461	536
Investment funds [member] | Level II [member] | Derivative [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	8,476	4,648
Investment funds [member] | Level III [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	10,722	10,077
Liabilities carried at fair value	3,278	2,695
Investment funds [member] | Level III [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,712	1,976
Investment funds [member] | Level III [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	8,802	7,837
Investment funds [member] | Level III [member] | Financial assets revalued amount [Member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	208	263
Investment funds [member] | Level III [member] | Shares [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	157	241
Investment funds [member] | Level III [member] | Shares [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,401	1,226
Investment funds [member] | Level III [member] | Debt securities [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,074	1,242
Investment funds [member] | Level III [member] | Debt securities [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	4	17
Investment funds [member] | Level III [member] | Other investments [member] | Available-for-sale financial assets [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	482	493
Investment funds [member] | Level III [member] | Other investments [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	2,049	1,376
Investment funds [member] | Level III [member] | Investment contracts for account of policyholders [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	1,805	1,871
Investment funds [member] | Level III [member] | Derivatives [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	56	35
Investment funds [member] | Level III [member] | Real estate [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	2,901	2,700
Investment funds [member] | Level III [member] | Investments in real estate for policyholders [member] | Financial assets at fair value through profit or loss [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	586	612
Investment funds [member] | Level III [member] | Real estate held for own use [member] | Financial assets revalued amount [Member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Assets carried at fair value	208	263
Investment funds [member] | Level III [member] | Investment contracts for account of policyholders [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	197	206
Investment funds [member] | Level III [member] | Derivative [member] | Recurring fair value measurement [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities carried at fair value	€ 3,081	€ 2,489
[1] Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.

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Expiry date 2020-01-01: The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. Effective 2020-01-01: The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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