Earnings Per Share - Summary of Basic Earnings Per Share (Detail) - EUR (€) € / shares in Units, € in Millions, shares in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings per share [line items]
Net result attributable to owners of Aegon N.V.	€ 1,980	€ (146)	€ 1,235
Coupons on perpetual securities	(39)	(38)	(88)
Net result attributable to owners for basic earnings per share calculation	1,941	(184)	1,148
Net result attributable to common shareholders	€ 1,928	€ (182)	€ 1,140
Weighted average number of common shares B outstanding (in million)	2,043	2,044	2,042
Basic earnings per common share (EUR per share)	€ 0.94	€ (0.09)	€ 0.56
Common share B [member]
Earnings per share [line items]
Net result attributable to common shareholders	€ 13	€ (1)	€ 8
Weighted average number of common shares B outstanding (in million)	559	561	572
Basic earnings per common share (EUR per share)	€ 0.02	€ 0	€ 0.01

Coupons on perpetual securities.

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- Definition

Profit (loss), attributable to owners of parent for basic earnings per share.

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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

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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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.

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