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Proposal for Profit Appropriation - Summary of Proposal for Profit Appropriation (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of proposal profit appropriation [Line Items] |  |  |
Owners of Aegon N.V. | € 1,239 | € 710 | € 2,469
Aegon N.V [member] |  |  |
Disclosure of proposal profit appropriation [Line Items] |  |  |
Final dividend on common shares | 329 | 307 |
Earnings to be retained | 910 | 403 |
Owners of Aegon N.V. | € 1,239 | € 710 | € 2,469

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