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Reinsurance (Ceded Reinsurance Receivable Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Ceded Credit Risk [Line Items]
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 2,818	$ 2,671
Reinsurance Ceded Receivables Percentage Total	68.00%
Reinsurer A [Member]
Ceded Credit Risk [Line Items]
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 1,600	$ 1,600

X

- Definition

Percentage of the Reinsurance Ceded Receivables and other total that is accounted for by 2 companies.

+ References

No definition available.

+ Details

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Namespace Prefix:	rga_
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479383/944-825-50-1B

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479616/944-310-45-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

+ Details

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Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: