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Derivative Instruments (Details 7) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
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Credit Exposure of Derivative Contracts |  |
Estimated fair value of derivatives in net asset (liability) position | $ 179,206,000 | $ 227,399,000
Cash provided as collateral | 0 | 0
Securities provided as collateral | (35,093,000) | (27,052,000)
Cash received as collateral | (178,584,000) | (241,480,000)
Securities received as collateral | (25,049,000) | (997,000)
Net credit exposure | 10,666,000 | 11,974,000
Margin account related to exchange-traded futures | $ 5,376,000 | $ 18,153,000

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition The aggregate estimated fair value asset (liability) of derivative instruments that are subject to or not subject to credit-contingent provisions at the end of the reporting period. + References No definition available. + Details
Name: | rga_DerivativesInNetAssetLiabilityPositionEstimatedFairValue
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The aggregate cash amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net liability position at the end of the reporting period. The estimated fair value amounts are included in cash. + References No definition available. + Details
Name: | rga_EstimatedFairValueOfCollateralProvidedIncludedInCash
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate estimated fair value amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net liability position at the end of the reporting period. The estimated fair value amounts are included in other invested assets. + References No definition available. + Details
Name: | rga_EstimatedFairValueOfCollateralProvidedIncludedInOtherInvestedAssets
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate cash amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net asset position at the end of the reporting period. The estimated fair value amounts are included in cash. + References No definition available. + Details
Name: | rga_EstimatedFairValueOfCollateralReceivedIncludedInCash
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The aggregate estimated fair value amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net asset position at the end of the reporting period. The estimated fair value amounts are included in fixed maturity securities. + References No definition available. + Details
Name: | rga_EstimatedFairValueOfCollateralReceivedIncludedInDebtSecurities
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the entity's margin account related to exchange-traded futures. + References No definition available. + Details
Name: | rga_MarginAccountForExchangeTradedFutures
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the entity's net credit exposure related to derivative contracts. + References No definition available. + Details
Name: | rga_NetCreditExposureOnDerivativeContracts
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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