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Shareholders' Equity - Summary of Shareholders' Equity (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | € 22,542 | [1] | € 24,079 | [2] | € 24,341 |
Owners of Aegon N.V. |  | 1,239 |  | 710 |  | 2,469 |
Changes in revaluation reserve real estate held for own use |  | (4) |  | (32) | [2] | 8 | [2]
Total other comprehensive income / (loss) |  | 2,232 |  | (1,107) | [2] | (1,968) | [2]
Shares issued |  | 1 |  |  |  | 3 |
Issuance and purchase of treasury shares |  | (825) |  | 14 |  | (105) |
Issuance and redemption of other equity instruments |  |  |  | (468) |  |  |
Dividend withholding tax reduction |  |  |  | 1 |  | 2 |
Coupons on perpetual securities |  | (88) |  | (102) |  | (103) |
Incentive plans |  | (3) |  | (2) |  | (1) |
Ending balance |  | 24,441 |  | 22,542 | [1] | 24,079 | [2]
Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 22,498 |  |  |  | 24,249 | [2]
Ending balance |  |  |  | 22,498 |  |  |
Share capital [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 7,808 | [1] | 8,053 | [2] | 8,193 |
Shares issued |  | 1 |  |  |  | 3 |
Ending balance |  | 7,536 |  | 7,808 | [1] | 8,053 | [2]
Share capital [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 7,808 |  |  |  | 8,193 | [2]
Ending balance |  |  |  | 7,808 |  |  |
Revaluation account [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 3,436 | [1] | 4,898 | [2] | 5,381 |
Changes in revaluation reserve real estate held for own use |  | (36) |  | (32) |  | 8 |
Total other comprehensive income / (loss) |  | 2,433 |  | (1,462) |  | (391) |
Ending balance |  | 5,868 |  | 3,436 | [1] | 4,898 | [2]
Revaluation account [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 3,436 |  |  |  | 5,289 | [2]
Ending balance |  |  |  | 3,436 |  |  |
Retained earnings [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 9,657 | [1] | 9,374 | [2] | 7,419 |
Changes in revaluation reserve real estate held for own use |  | 32 |  |  |  |  |
Total other comprehensive income / (loss) |  | 40 |  | (3) |  | 13 |
Issuance and purchase of treasury shares |  | (81) |  | 14 |  | (105) |
Issuance and redemption of other equity instruments |  |  |  | 2 |  |  |
Dividend withholding tax reduction |  |  |  | 1 |  | 2 |
Coupons on perpetual securities |  | (88) |  | (102) |  | (103) |
Incentive plans |  | 2 |  |  |  | 4 |
Ending balance |  | 10,386 |  | 9,657 | [1] | 9,374 | [2]
Retained earnings [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 9,613 |  |  |  | 7,419 | [2]
Ending balance |  |  |  | 9,613 |  |  |
Remeasurement of defined benefit Plans of group companies [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | (1,850) | [1] | (1,669) | [2] | (1,820) |
Total other comprehensive income / (loss) |  | (547) |  | (182) |  | 151 |
Ending balance |  | (2,397) |  | (1,850) | [1] | (1,669) | [2]
Remeasurement of defined benefit Plans of group companies [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | (1,850) |  |  |  | (1,820) | [2]
Ending balance |  |  |  | (1,850) |  |  |
Aegon N.V [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance | [3] | 19,200 |  |  |  |  |
Owners of Aegon N.V. |  | 1,239 |  | 710 |  | 2,469 |
Ending balance |  | 21,850 |  | 19,200 | [3] |  |
Aegon N.V [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 19,200 |  | 20,287 |  |  |
Mandatory change in accounting policy |  | (44) |  |  |  |  |
Changes in accounting policies related to liability adequancy testing |  |  |  | (22) |  |  |
Net income |  | 1,239 |  | 710 |  |  |
Owners of Aegon N.V. |  | 1,239 |  | 710 |  |  |
Foreign currency translation differences and movement in foreign investment hedging reserves |  | 271 |  | 499 |  |  |
Changes in revaluation subsidiaries |  | 2,460 |  | (1,462) |  |  |
Changes in revaluation reserve real estate held for own use |  | (3) |  |  |  |  |
Remeasurement of defined benefit plans of group companies |  | (522) |  | (150) |  |  |
Changes and transfer to legal reserve |  | 11 |  | 9 |  |  |
Other |  | 15 |  | (3) |  |  |
Total other comprehensive income / (loss) |  | 2,234 |  | (1,108) |  |  |
Shares issued |  | 1 |  |  |  |  |
Dividends paid on common shares |  | (583) |  | (573) |  |  |
Issuance and purchase of treasury shares |  | (30) |  |  |  |  |
Issuance and redemption of other equity instruments |  | (81) |  |  |  |  |
Dividend withholding tax reduction |  |  |  | 1 |  |  |
Treasury shares |  |  |  | (14) |  |  |
Coupons on perpetual securities |  | (88) |  |  |  |  |
Incentive plans |  | 2 |  |  |  |  |
Coupons and premium on convertible core capital securities and coupon on perpetual securities, net of tax |  |  |  | (113) |  |  |
Ending balance |  | 21,850 |  | 19,200 |  | 20,287 |
Aegon N.V [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 19,156 |  | 20,265 |  |  |
Ending balance |  |  |  | 19,156 |  | 20,265 |
Aegon N.V [member] | Share capital [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 322 |  | 322 |  |  |
Shares issued |  | 1 |  |  |  |  |
Ending balance |  | 323 |  | 322 |  | 322 |
Aegon N.V [member] | Share capital [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 322 |  | 322 |  |  |
Ending balance |  |  |  | 322 |  | 322 |
Aegon N.V [member] | Paid-in surplus [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 7,486 |  | 7,731 |  |  |
Dividends paid on common shares |  | (273) |  | (244) |  |  |
Ending balance |  | 7,213 |  | 7,486 |  | 7,731 |
Aegon N.V [member] | Paid-in surplus [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 7,486 |  | 7,731 |  |  |
Ending balance |  |  |  | 7,486 |  | 7,731 |
Aegon N.V [member] | Revaluation account [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Changes and transfer to legal reserve |  | 143 |  |  |  |  |
Aegon N.V [member] | Revaluation account [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 3,540 |  | 5,017 |  |  |
Changes in accounting policies related to liability adequancy testing |  |  |  | (22) |  |  |
Changes in revaluation subsidiaries |  | 2,460 |  | (1,462) |  |  |
Changes in revaluation reserve real estate held for own use |  | (28) |  |  |  |  |
Changes and transfer to legal reserve |  |  |  | 7 |  |  |
Total other comprehensive income / (loss) |  | 2,576 |  | (1,455) |  |  |
Ending balance |  | 6,116 |  | 3,540 |  | 5,017 |
Aegon N.V [member] | Revaluation account [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 3,540 |  | 4,995 |  |  |
Ending balance |  |  |  | 3,540 |  | 4,995 |
Aegon N.V [member] | Legal reserve FCTR [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 130 |  | (401) |  |  |
Foreign currency translation differences and movement in foreign investment hedging reserves |  | 296 |  | 531 |  |  |
Total other comprehensive income / (loss) |  | 296 |  | 531 |  |  |
Ending balance |  | 426 |  | 130 |  | (401) |
Aegon N.V [member] | Legal reserve FCTR [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 130 |  | (401) |  |  |
Ending balance |  |  |  | 130 |  | (401) |
Aegon N.V [member] | Legal reserve group companies [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 1,326 |  | 1,122 |  |  |
Changes and transfer to legal reserve |  | 377 |  | 204 |  |  |
Total other comprehensive income / (loss) |  | 377 |  | 204 |  |  |
Ending balance |  | 1,703 |  | 1,326 |  | 1,122 |
Aegon N.V [member] | Legal reserve group companies [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 1,326 |  | 1,122 |  |  |
Ending balance |  |  |  | 1,326 |  | 1,122 |
Aegon N.V [member] | Retained earnings [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Changes and transfer to legal reserve |  | 509 |  |  |  |  |
Aegon N.V [member] | Retained earnings [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 7,872 |  | 6,022 |  |  |
Mandatory change in accounting policy |  | (44) |  |  |  |  |
Net income 2017 retained |  |  |  | 2,469 |  |  |
Net income 2018 retained |  | 710 |  |  |  |  |
Owners of Aegon N.V. |  | 710 |  | 2,469 |  |  |
Changes in revaluation reserve real estate held for own use |  | 25 |  |  |  |  |
Changes and transfer to legal reserve |  |  |  | (202) |  |  |
Other |  | 15 |  | (3) |  |  |
Total other comprehensive income / (loss) |  | (469) |  | (205) |  |  |
Dividends paid on common shares |  | (309) |  | (329) |  |  |
Issuance and purchase of treasury shares |  | (86) |  |  |  |  |
Issuance and redemption of other equity instruments |  | (81) |  |  |  |  |
Dividend withholding tax reduction |  |  |  | 1 |  |  |
Treasury shares |  |  |  | 26 |  |  |
Coupons on perpetual securities |  | (88) |  |  |  |  |
Incentive plans |  | 2 |  |  |  |  |
Coupons and premium on convertible core capital securities and coupon on perpetual securities, net of tax |  |  |  | (113) |  |  |
Ending balance |  | 7,508 |  | 7,872 |  | 6,022 |
Aegon N.V [member] | Retained earnings [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 7,828 |  | 6,022 |  |  |
Ending balance |  |  |  | 7,828 |  | 6,022 |
Aegon N.V [member] | Remeasurement of defined benefit Plans of group companies [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | (1,850) |  | (1,669) |  |  |
Foreign currency translation differences and movement in foreign investment hedging reserves |  | (25) |  | (32) |  |  |
Remeasurement of defined benefit plans of group companies |  | (522) |  | (150) |  |  |
Total other comprehensive income / (loss) |  | (547) |  | (182) |  |  |
Ending balance |  | (2,397) |  | (1,850) |  | (1,669) |
Aegon N.V [member] | Remeasurement of defined benefit Plans of group companies [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | (1,850) |  | (1,669) |  |  |
Ending balance |  |  |  | (1,850) |  | (1,669) |
Aegon N.V [member] | Treasury shares [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | (337) |  | (325) |  |  |
Issuance and purchase of treasury shares |  | 56 |  |  |  |  |
Treasury shares |  |  |  | (12) |  |  |
Ending balance |  | (281) |  | (337) |  | (325) |
Aegon N.V [member] | Treasury shares [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | (337) |  | (325) |  |  |
Ending balance |  |  |  | (337) |  | (325) |
Aegon N.V [member] | Net income /(loss) [member] | Common Share B [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | 710 |  | 2,469 |  |  |
Net income 2017 retained |  |  |  | (2,469) |  |  |
Net income 2018 retained |  | (710) |  |  |  |  |
Net income |  | 1,239 |  | 710 |  |  |
Owners of Aegon N.V. |  | 529 |  | (1,759) |  |  |
Ending balance |  | 1,239 |  | 710 |  | 2,469 |
Aegon N.V [member] | Net income /(loss) [member] | Common Share B [member] | Restated [member] |  |  |  |  |  |  |
Disclosure of shareholders equity [line items] |  |  |  |  |  |  |
Beginning balance |  | € 710 |  | 2,469 |  |  |
Ending balance |  |  |  | € 710 |  | € 2,469 |
[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.
[3] | 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 in the consolidated notes for details about this change.

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