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Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Allowance For Loan And Lease Losses Roll Forward
Balance, Beginning of Period	$ 107	$ 75	$ 93	$ 67
Provision (release)	0	0	0	(8)
Balance, End of Period	113	87	113	87
Allowance For Loan and Lease Losses Provision Of Credit Losses	$ 6	$ 12	$ 20	$ 28

X

- Definition

Allowance For Loan and Lease Losses Provision Of Credit Losses

+ References

No definition available.

+ Details

Name:	rga_AllowanceForLoanAndLeaseLossesProvisionOfCreditLosses
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Allowance For Loan And Lease Losses Writeoff Net Of Recoveries

+ References

No definition available.

+ Details

Name:	rga_AllowanceForLoanAndLeaseLossesWriteoffNetOfRecoveries
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

No definition available.

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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