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Significant accounting policies - Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1] | Dec. 31, 2017
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Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items] |  |  |  |  |
Shareholders' Equity | € 21,850 | € 19,200 | [1] | € 20,266 |
Insurance contracts | 123,454 | 115,328 | [1] | 110,848 |
Deferred tax liability | € 1,227 | 529 | [1] | € 1,021 |
Previously stated [member] |  |  |  |  |
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items] |  |  |  |  |
Shareholders' Equity |  | 19,225 |  |  | € 20,288
Insurance contracts |  | 115,294 |  |  | 110,818
Deferred tax liability |  | 538 |  |  | 1,029
Changes in accounting policy due to liability adequacy testing |  |  |  |  |
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items] |  |  |  |  |
Shareholders' Equity |  | (26) |  |  | (23)
Insurance contracts |  | 34 |  |  | 30
Deferred tax liability |  | (9) |  |  | (8)
As Restated [Member] |  |  |  |  |
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Consolidated Balance Sheet [Line Items] |  |  |  |  |
Shareholders' Equity |  | 19,200 |  |  | 20,266
Insurance contracts |  | 115,328 |  |  | 110,848
Deferred tax liability |  | € 529 |  |  | € 1,021
[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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