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Earnings Per Share - Summary of Basic Earnings Per Share (Detail) - EUR (€) € / shares in Units, € in Millions, shares in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings per share [line items] |  |  |
Owners of Aegon N.V. | € 1,239 | € 710 | € 2,469
Coupons on perpetual securities | (88) | (102) | (103)
Coupons on non-cumulative subordinated notes |  | (11) | (28)
Net income / (loss) attributable to owners for basic earnings per share calculation | 1,151 | 597 | 2,338
Net income / (loss) attributable to common shareholders | € 1,143 | € 593 | € 2,321
Weighted average number of common shares B outstanding (in million) | 2,042 | 2,036 | 2,042
Basic earnings per common share (EUR per share) | € 0.56 | € 0.29 | € 1.14
Common share B [member] |  |  |
Earnings per share [line items] |  |  |
Net income / (loss) attributable to common shareholders | € 8 | € 4 | € 16
Weighted average number of common shares B outstanding (in million) | 572 | 571 | 575
Basic earnings per common share (EUR per share) | € 0.01 | € 0.01 | € 0.03

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- Definition Coupons on non-cumulative subordinated notes. + References No definition available. + Details
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- Definition Coupons on perpetual securities. + References No definition available. + Details
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- Definition Profit (loss), attributable to owners of parent for basic earnings per share. + References No definition available. + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_81B_a_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_b&doctype=Standard -URIDate 2019-03-27 + Details
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