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Significant accounting policies - Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Equity Statement Changes (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1] | Dec. 31, 2017 | Dec. 31, 2016
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Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Equity Statement Changes [Line Items] |  |  |  |  |  |
Share capital | € 323 | € 322 |  |  | € 322 |
Revaluation reserves | 5,868 | 3,436 |  |  |  |
Other reserves | 456 | 149 |  |  | (390) | € 1,347
Shareholders' Equity | € 21,850 | 19,200 | [1] | € 20,266 |  |
Previously stated [member] |  |  |  |  |  |
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Equity Statement Changes [Line Items] |  |  |  |  |  |
Share capital |  | 7,808 |  |  | 8,053 |
Retained earnings |  | 9,657 |  |  | 9,374 |
Revaluation reserves |  | 3,461 |  |  | 4,920 |
Remeasurement of defined benefit plans |  | (1,850) |  |  | (1,669) |
Other reserves |  | 149 |  |  | (390) |
Shareholders' Equity |  | 19,225 |  |  | 20,288 |
Changes in accounting policy due to liability adequacy testing |  |  |  |  |  |
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Equity Statement Changes [Line Items] |  |  |  |  |  |
Revaluation reserves |  | (26) |  |  | (23) |
Shareholders' Equity |  | (26) |  |  | (23) |
As Restated [Member] |  |  |  |  |  |
Impact On Changes In Accounting Policy Due To Changes In Liability Adequacy Testing Equity Statement Changes [Line Items] |  |  |  |  |  |
Share capital |  | 7,808 |  |  | 8,053 |
Retained earnings |  | 9,657 |  |  | 9,374 |
Revaluation reserves |  | 3,436 |  |  | 4,898 |
Remeasurement of defined benefit plans |  | (1,850) |  |  | (1,669) |
Other reserves |  | 149 |  |  | (390) |
Shareholders' Equity |  | € 19,200 |  |  | € 20,266 |
[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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