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Insurance Contracts - Summary of Movements in Insurance (Detail) - EUR (€) € in Millions | 12 Months Ended
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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.

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- Definition The increase (decrease) in deferred acquisition costs arising from insurance contracts that result from shadow accounting. Shadow accounting is a practice with the following two features: (a) a recognised but unrealised gain or loss on an asset affects the measurement of the insurance liability in the same way that a realised gain or loss does; and (b) if unrealised gains or losses on an asset are recognised directly in equity, the resulting change in the carrying amount of the insurance liability is also recognised in equity. [Refer: Deferred acquisition costs arising from insurance contracts] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_e&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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