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Insurance Contracts - Summary of Movements in Insurance (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of types of insurance contracts [Line Items]    
Beginning balance [1] € 115,328  
Beginning balance [1] 20,507  
Ending balance 20,835 € 20,507 [1]
Ending balance 123,454 115,328 [1]
Life insurance general account [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 102,452 98,452
Beginning balance 18,712 17,419
Disposals (44)  
Portfolio transfers and acquisitions (8) 95
Unwind of discount / interest credited 887 860
Gross premium and deposits - existing and new business 6,913 6,293
Unwind of discount / interest credited 3,795 3,711
Changes in valuation of expected future benefits (16) 109
Insurance liabilities released (9,921) (9,582)
Changes in valuation of expected future benefits 800 617
Loss recognized as a result of liability adequacy testing 1,587 49
Shadow accounting adjustments 1,948 (299)
Net exchange differences 1,271 3,087
Net exchange differences 369 858
Transfer (to) / from insurance contracts 18  
Transfer (to) / from insurance contracts for account of policyholders 1,050 27
Ending balance 19,046 18,712
Other 17 1
Ending balance 109,879 102,452
Insurance contracts for general account [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 4,377 3,913
Gross premium and deposits - existing and new business 1,397 1,441
Unwind of discount / interest credited 211 199
Insurance liabilities released (1,668) (1,557)
Changes in valuation of expected future benefits (30) 190
Shadow accounting adjustments 12 (11)
Loss recognized as a result of liability adequacy 3 (4)
Net exchange differences 81 205
Other 2 2
Ending balance 4,385 4,377
Non-life insurance [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 8,499 8,484
Beginning balance 1,356 1,327
Unwind of discount / interest credited 88 84
Gross premium and deposits - existing and new business 1,594 1,563
Unwind of discount / interest credited 481 450
Insurance liabilities released (1,087) (1,052)
Changes in valuation of expected future benefits (7) (8)
Change in unearned premiums (720) (742)
Change in unexpired risks 2 2
Incurred related to current year 718 747
Incurred related to prior years 316 195
Release for claims settled current year (292) (278)
Release for claims settled prior years (788) (704)
Shadow accounting adjustments 422 (459)
Change in IBNR (73) (51)
Net exchange differences 131 354
Net exchange differences 25 65
Ending balance 1,376 1,356
Other (5) (2)
Ending balance 9,190 8,499
Insurance Contracts for Account of Policyholders [member]    
Disclosure of types of insurance contracts [Line Items]    
Beginning balance 117,113 122,168
Disposals (196)  
Portfolio transfers and acquisitions (10) (140)
Gross premium and deposits - existing and new business 9,122 9,716
Unwind of discount / interest credited 19,780 (5,311)
Insurance liabilities released (11,103) (10,471)
Fund charges released (1,677) (1,671)
Changes in valuation of expected future benefits 861 (245)
Net exchange differences 2,868 3,092
Transfer (to) / from insurance contracts (1,050) (27)
Other 2 2
Ending balance € 135,710 € 117,113
[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.