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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
	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.

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- Definition

Coupons on perpetual securities.

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- Definition

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

+ References

No definition available.

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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 domain 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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- Definition

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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