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Shareholders' Equity - Additional Information (Detail) € / shares in Units, € in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 23, 2019 | May 18, 2018 | Dec. 31, 2019 EUR (€) € / shares shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 EUR (€) € / shares shares | Dec. 31, 2017 shares
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  | 91,893,000 |  | 76,419,000 |  | 80,996,000
Revaluation | € |  |  | € 5,868 |  | € 3,436 |  |
Aegon N.V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Revaluation | € |  |  | 6,116 |  | 3,540 | [1] |
Revaluation account [member] | Aegon N.V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Revaluation | € |  |  | 6,438 |  | 4,434 |  |
Revaluation deficit [member] | Aegon N.V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Revaluation | € |  |  | € 323 |  | € 895 |  |
Vereniging Aegon [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Percentage of shareholding stake in acquired company |  |  | 32.60% |  |  |  |
Vereniging Aegon [member] | Aegon N.V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Percentage of shareholding stake in acquired company | 32.60% |  | 32.60% |  |  |  |
Common shares [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Common shares issuance, par value | € / shares |  |  | € 0.12 |  |  |  |
Common shares [member] | Aegon N. V. and subsidiaries [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Common shares issuance, par value | € / shares |  |  |  |  | € 0.12 |  |
Number of common shares |  |  | 66,583,671 |  |  |  |
Common shares [member] | Aegon N.V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Common shares issuance, par value | € / shares |  |  | € 0.12 |  |  |  |
Number of common shares |  |  | 2,105,139,000 |  | 2,095,648,000 |  | 2,095,648,000
Common shares [member] | Aegon N V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  | 65,540,000 |  | 61,418,000 |  | 64,488,000
Common share B [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Common shares issuance, par value | $ / shares |  |  |  | $ 0.12 |  |  |
Common share B [member] | Aegon N. V. and subsidiaries [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Common shares issuance, par value | € / shares |  |  |  |  | € 0.12 |  |
Number of common shares |  |  |  |  | 13,856,480 |  |
Common share B [member] | Aegon N.V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  | 585,022,000 |  | 585,022,000 |  | 585,022,000
Common share B [member] | Aegon N V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  | 25,309,920 |  |  |  |
Ordinary share [member] | Aegon N. V. and subsidiaries [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  |  |  | 62,562,070 |  |
Common shares [member] | Aegon N. V. and subsidiaries [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  | 66,583,671 |  | 62,562,070 |  |
Common shares B [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  | 25,310,000 |  | 13,856,000 |  | 15,346,000
Common shares B [member] | Aegon N V [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Number of common shares |  |  | 25,309,920 |  | 13,856,480 |  |
Common shares B [member] | Vereniging Aegon [member] |  |  |  |  |  |  |
Summary of issued share capital and reserves attributable to shareholders [line items] |  |  |  |  |  |  |
Proportion of market value of common shares in capital |  | 2.50% |  |  |  |  |
[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 in the consolidated notes for details about this change.

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