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Commitments, Contingencies and Guarantees Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Liability For Expected Credit Losses Included in Other Liabilities	$ 1	$ 2

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- Definition

Liability For Expected Credit Losses Included in Other Liabilities, associated with unfunded commitments.

+ References

No definition available.

+ Details

Name:	rga_LiabilityForExpectedCreditLossesIncludedinOtherLiabilities
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration