Defined Benefit Plans - Estimated Approximate Effects on the Defined Benefit Obligation (Detail) - Aegon United Kingdom [member] - EUR (€)	Dec. 31, 2021	Dec. 31, 2020
Demographic actuarial assumption on mortality rates by 10% Variation [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase in actuarial assumptions	€ (55)	€ (55)
Decrease in actuarial assumptions	62	63
Financial actuarial assumptions of discount rates by 100 basis points variation [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase in actuarial assumptions	(322)	(330)
Decrease in actuarial assumptions	433	448
Finance actuarial assumption on price inflation by 100 basis points variation [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase in actuarial assumptions	202	172
Decrease in actuarial assumptions	€ (237)	€ (316)

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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