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Defined Benefit Plans - Estimated Approximate Effects on the Defined Benefit Obligation (Detail) - Aegon United Kingdom [member] - EUR (€)	Dec. 31, 2019	Dec. 31, 2018
Demographic actuarial assumption on mortality rates by 10% Variation [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Increase in actuarial assumptions	€ (48)	€ (34)
Decrease in actuarial assumptions	54	38
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	(306)	(235)
Decrease in actuarial assumptions	414	313
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	130	119
Decrease in actuarial assumptions	€ (281)	€ (192)

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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]]

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- Definition

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]]

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