Defined Benefit Plans - Summary of Target Allocation of Plan Assets for Retirement Benefit Plans for the Next Annual Period (Detail)	Dec. 31, 2023	Dec. 31, 2022
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Debt instruments	20.00%	16.00%
Other	8.00%	11.00%
Aegon United Kingdom [member] \| Actuarial assumption of expected rates of pension increases [member] \| Defined benefit plans [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Equity instruments	16.10%
Debt instruments	83.90%
Aegon USA [member] \| Actuarial assumption of expected rates of pension increases [member] \| Defined benefit plans [member] \| Bottom of range [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Equity instruments	2.00%
Debt instruments	80.00%
Other	8.00%
Aegon USA [member] \| Actuarial assumption of expected rates of pension increases [member] \| Defined benefit plans [member] \| Top of range [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Equity instruments	4.00%
Debt instruments	90.00%
Other	16.00%

The percentage instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Debt instruments, amount contributed to fair value of plan assets]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 142
-Subparagraph c
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+ References

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- Definition

The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Equity instruments, amount contributed to fair value of plan assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 142
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_142_b&doctype=Standard
-URIDate 2023-03-23

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- Definition

The percentage other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Other assets, amount contributed to fair value of plan assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 19
-IssueDate 2023-01-01
-Paragraph 142
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_142&doctype=Standard
-URIDate 2023-03-23

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