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Defined Benefit Plans - Summary of Actuarial Assumptions Used to Determine Defined Benefit Obligations (Detail) | 12 Months Ended
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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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- 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 -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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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 -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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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 -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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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]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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