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Fair Value - Disclosures of Changes in Level 3 Assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance [1] € 392,633  
Beginning balance [1] 370,091  
Ending balance 440,348 € 392,633 [1]
Ending balance 415,907 370,091 [1]
Real estate held for own use [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 263  
Total gains /losses in income statement 7  
Total gains /losses in OCI 3  
Purchases (5)  
Sales (62)  
Net exchange difference 3  
Transfers to disposal groups 0  
Ending balance 208 263
Level III [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 2,695 2,064
Total gains /losses in income statement 605 604
Total gains /losses in OCI 4  
Purchases 4 7
Sales (46) (14)
Net exchange difference 15 35
Transfers to disposal groups 0 0
Ending balance 3,278 2,695
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 75 614
Level III [member] | Investment contracts for account of policyholders [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 206 219
Total gains /losses in income statement 9 (10)
Purchases 4 7
Sales (23) (14)
Net exchange difference 1 4
Transfers to disposal groups 0 0
Ending balance 197 206
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held (10)  
Level III [member] | Derivative [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 2,489 1,845
Total gains /losses in income statement 597 613
Total gains /losses in OCI 4  
Sales (22)  
Net exchange difference 13 31
Transfers to disposal groups 0 0
Ending balance 3,081 2,489
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 84 613
Level III [member] | Recurring fair value measurement [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 10,077 9,130
Acquisition through business combinations   130
Disposal of a business   (1)
Total gains /losses in income statement 379 435
Total gains /losses in OCI (37) (87)
Purchases 3,509 2,570
Sales (2,880) (1,624)
Settlements (194) (472)
Net exchange difference 122 185
Reclassification   42
Transfers from levels I and II 263 151
Transfers to levels I and II (517) (382)
Transfers to disposal groups 0 0
Ending balance 10,722 10,077
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 179 388
Level III [member] | Recurring fair value measurement [member] | Real estate held for own use [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 263 307
Disposal of a business   (1)
Total gains /losses in income statement 7 (19)
Total gains /losses in OCI 3 (39)
Purchases (5) 17
Sales (62) (10)
Settlements 0  
Net exchange difference 3 7
Transfers to disposal groups 0 0
Ending balance 208 263
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held   5
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 1,976 2,318
Total gains /losses in income statement (97) (36)
Total gains /losses in OCI (40) (48)
Purchases 1,584 629
Sales (1,297) (255)
Settlements (194) (473)
Net exchange difference 32 87
Reclassification 1 6
Transfers from levels I and II 178 58
Transfers to levels I and II (431) (310)
Transfers to disposal groups 0 0
Ending balance 1,712 1,976
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Money markets and other short term instruments [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Purchases 1,061  
Sales (855)  
Settlements (103)  
Transfers from levels I and II 126  
Transfers to levels I and II (229)  
Transfers to disposal groups 0  
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Shares [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 241 288
Total gains /losses in income statement   21
Total gains /losses in OCI (5) (12)
Purchases 22 9
Sales (100) (77)
Net exchange difference 4 10
Reclassification 2 2
Transfers to levels I and II (7)  
Transfers to disposal groups 0 0
Ending balance 157 241
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Debt securities [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 1,242 1,447
Total gains /losses in income statement 3 26
Total gains /losses in OCI 21 2
Purchases 319 494
Sales (317) (76)
Settlements (68) (452)
Net exchange difference 19 51
Reclassification (2) 1
Transfers from levels I and II 52 58
Transfers to levels I and II (195) (310)
Transfers to disposal groups 0 0
Ending balance 1,074 1,242
Level III [member] | Recurring fair value measurement [member] | Available-for-sale financial assets [member] | Other investments [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 493 583
Total gains /losses in income statement (100) (83)
Total gains /losses in OCI (56) (38)
Purchases 183 125
Sales (25) (102)
Settlements (23) (21)
Net exchange difference 9 25
Reclassification   3
Transfers to disposal groups 0 0
Ending balance 482 493
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 7,837 6,506
Acquisition through business combinations   130
Total gains /losses in income statement 468 490
Purchases 1,931 1,924
Sales (1,521) (1,360)
Settlements (1)  
Net exchange difference 88 90
Reclassification (1) 36
Transfers from levels I and II 85 94
Transfers to levels I and II (86) (72)
Transfers to disposal groups 0 0
Ending balance 8,802 7,837
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 179 383
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 1,226 604
Total gains /losses in income statement 72 104
Purchases 368 541
Sales (266) (61)
Settlements   1
Net exchange difference 1 1
Reclassification   36
Transfers to disposal groups 0 0
Ending balance 1,401 1,226
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 62 105
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 17 4
Total gains /losses in income statement (1) (25)
Purchases 1 37
Sales (12)  
Settlements (1)  
Reclassification (1)  
Transfers to disposal groups 0 0
Ending balance 4 17
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held   (24)
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 1,376 1,255
Total gains /losses in income statement 34 11
Purchases 884 332
Sales (268) (307)
Net exchange difference 23 64
Transfers from levels I and II 85 94
Transfers to levels I and II (86) (72)
Transfers to disposal groups 0 0
Ending balance 2,049 1,376
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 36 3
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investment contracts for account of policyholders [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 1,871 1,784
Acquisition through business combinations   130
Total gains /losses in income statement 45 76
Purchases 435 537
Sales (567) (660)
Net exchange difference 20 3
Transfers to disposal groups 0 0
Ending balance 1,805 1,871
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 86 35
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Derivatives [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 35 57
Total gains /losses in income statement 19 57
Purchases 35  
Sales (33) (80)
Transfers to disposal groups 0 0
Ending balance 56 35
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 20 59
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 2,700 2,147
Total gains /losses in income statement 317 261
Purchases 206 474
Sales (331) (209)
Net exchange difference 9 27
Transfers to disposal groups 0 0
Ending balance 2,901 2,700
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held 2 202
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investments in real estate for policyholders [member]    
Changes in fair value measurement assets and liabilities [Line Items]    
Beginning balance 612 655
Total gains /losses in income statement (18) 5
Purchases 2 2
Sales (43) (43)
Net exchange difference 34 (7)
Transfers to disposal groups 0 0
Ending balance 586 612
Total unrealized gains and (losses) for the period recorded in the P&L for instruments held € (27) € 4
[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.