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Reinsurance Assets - Summary of Reinsurance Assets Relating to Life 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] | € 20,507 |  |
Ending balance |  | 20,835 | € 20,507 | [1]
Life insurance general account [member] |  |  |  |
Disclosure of types of insurance contracts [Line Items] |  |  |  |
Beginning balance |  | 18,712 | 17,419 |
Gross premium and deposits - existing and new business |  | 2,170 | 2,038 |
Unwind of discount / interest credited |  | 887 | 860 |
Insurance liabilities released |  | (3,028) | (2,518) |
Fund charges released |  | (85) | (82) |
Changes to valuation of expected future benefits |  | (16) | 109 |
Policy transfers |  |  | 25 |
Net exchange differences |  | 369 | 858 |
Transfer to/from insurance contracts |  | 22 |  |
Other movements |  | 16 | 2 |
Ending balance |  | 19,046 | 18,712 |
Life insurance for account of policyholders [member] |  |  |  |
Disclosure of types of insurance contracts [Line Items] |  |  |  |
Beginning balance |  | 2 | 2 |
Gross premium and deposits - existing and new business |  |  | 3 |
Insurance liabilities released |  |  | (3) |
Disposal of a business |  | (2) |  |
Ending balance |  |  | 2 |
Insurance [member] |  |  |  |
Disclosure of types of insurance contracts [Line Items] |  |  |  |
Beginning balance |  | 18,714 | 17,421 |
Gross premium and deposits - existing and new business |  | 2,170 | 2,041 |
Unwind of discount / interest credited |  | 887 | 860 |
Insurance liabilities released |  | (3,028) | (2,521) |
Fund charges released |  | (85) | (82) |
Changes to valuation of expected future benefits |  | (16) | 109 |
Policy transfers |  |  | 25 |
Net exchange differences |  | 369 | 858 |
Disposal of a business |  | (2) |  |
Transfer to/from insurance contracts |  | 22 |  |
Other movements |  | 16 | 2 |
Ending balance |  | € 19,046 | € 18,714 |
[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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