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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

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- 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

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- 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

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- 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

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- 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