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Derivative Instruments (Details 7) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Credit Exposure of Derivative Contracts |  |
Estimated fair value of derivatives in net asset (liability) position | $ 133,157,000 | $ 136,558,000
Cash provided as collateral | (6,250,000) | (27,867,000)
Securities provided as collateral | (14,118,000) | (1,565,000)
Cash received as collateral | (126,329,000) | (136,414,000)
Securities received as collateral | (17,664,000) | (22,458,000)
Net credit exposure | 9,532,000 | 7,118,000
Margin account related to exchange-traded futures | $ 3,529,000 | $ 5,605,000

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- Details
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Namespace Prefix: | rga_
Data Type: | xbrli:stringItemType
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
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 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

X
- 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
Period Type: | instant