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Shareholders' Equity - Summary of Issued Share Capital and Reserves Attributable to Shareholders (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [2] | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Share capital - par value | € 323 | € 322 |  |  |  |  |
Share premium | 7,213 | 7,487 |  |  | € 7,731 |  | € 7,873
Total share capital | 323 | 322 |  |  | 322 |  |
Treasury shares | (281) | (337) |  |  | (325) |  |
Revaluation reserves | 5,868 | 3,436 |  |  |  |  |
Other reserves | 456 | 149 |  |  | (390) |  | 1,347
Group equity | 24,441 | 22,542 | [1] | € 24,079 | 24,079 | [2] | € 24,341
Shareholders of Aegon NV [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Share capital - par value | 323 | 322 |  |  | 322 |  |
Share premium | 7,213 | 7,487 |  |  | 7,731 |  |
Total share capital | 7,536 | 7,808 |  |  | 8,053 |  |
Retained earnings | 10,667 | 9,995 |  |  | 9,699 |  |
Treasury shares | (281) | (337) |  |  | (325) |  |
Total retained earnings | 10,386 | 9,657 |  |  | 9,374 |  |
Revaluation reserves | 5,868 | 3,436 |  |  | 4,898 |  |
Remeasurement of defined benefit plans | (2,397) | (1,850) |  |  | (1,669) |  |
Other reserves | 456 | 149 |  |  | (390) |  |
Group equity | € 21,850 | € 19,200 |  |  | € 20,266 |  |
[1] | See note 2.1.1 for details about the impact of adopting IFRS 16 on Leases and note 2.1.2 for details about the impact of voluntary change in accounting policy on Liability Adequacy Testing
[2] | 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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