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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Net Investment In Foreign Operations Hedges | $ 137 | $ 139
Counterparty Credit Derivative Exposure | 18 |
Derivative Credit Risk Valuation Adjustment, Derivative Assets | (36) | $ (70)
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax Future Reclass | $ 5 |

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- Definition Counterparty Credit Derivative Exposure + References No definition available. + Details
Name: | rga_CounterpartyCreditDerivativeExposure
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) related to hedges of net investments in foreign operations. + References No definition available. + Details
Name: | rga_CumulativeForeignCurrencyTranslationGainLossRecordedInAccumulatedOtherComprehensiveIncomeLossForNetInvestmentInForeignOperationsHedges
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax Future Reclass + References No definition available. + Details
Name: | rga_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTaxFutureReclass
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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 No definition available. + Details
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Namespace Prefix: | us-gaap_
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