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Defined Benefit Plans - Summary of Actuarial Assumptions Used to Determine Defined Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Aegon United Kingdom [member]
Demographic actuarial assumptions
Mortality	UK mortality table	UK mortality table
Financial actuarial assumptions
Discount rate	2.08%	2.94%
Price inflation	3.08%	3.32%
Aegon Nederland N.V. [member]
Financial actuarial assumptions
Discount rate	0.94%	1.74%
Salary increase rate	Curve 2019	Curve 2018
Indexation	59.2% of Curve 2019	57.75% of Curve 2018
United States [member]
Demographic actuarial assumptions
Mortality	US mortality table	US mortality table
Financial actuarial assumptions
Salary increase rate	4.00%	3.85%
Health care trend rate	6.60%	7.00%
United States [member] | Top of range [member]
Financial actuarial assumptions
Discount rate	3.23%	4.22%
United States [member] | Bottom of range [member]
Financial actuarial assumptions
Discount rate	3.02%	4.05%

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Description of actuarial assumption of expected rates of inflation.

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Description of actuarial assumption of expected rates of salary increases.

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- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 19
-IssueDate 2019-01-01
-Paragraph 144
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- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

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