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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Asset [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 238,804rga_DerivativeFairValueOfFreeStandingDerivativeAsset  
Derivative Asset, Fair Value, Gross Asset 260,898us-gaap_DerivativeFairValueOfDerivativeAsset 101,352us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Asset, Fair Value, Gross Liability (14,111)us-gaap_DerivativeAssetFairValueGrossLiability (26,125)us-gaap_DerivativeAssetFairValueGrossLiability
Derivative Asset 224,693us-gaap_DerivativeAssets 75,227us-gaap_DerivativeAssets
Derivative Asset, Fair Value of Collateral (20,260)us-gaap_DerivativeAssetFairValueOfCollateral [1] (11,095)us-gaap_DerivativeAssetFairValueOfCollateral [1]
Derivative, Collateral, Obligation to Return Cash (178,141)us-gaap_DerivativeCollateralObligationToReturnCash [2] (51,006)us-gaap_DerivativeCollateralObligationToReturnCash [2]
Derivative Asset, Fair Value, Amount Offset Against Collateral 26,292us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 13,126us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Derivative Liability [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 56,665rga_DerivativeFairValueOfFreeStandingDerivativeLiability 42,336rga_DerivativeFairValueOfFreeStandingDerivativeLiability
Derivative Liability, Fair Value, Gross Asset (14,111)us-gaap_DerivativeLiabilityFairValueGrossAsset (26,125)us-gaap_DerivativeLiabilityFairValueGrossAsset
Derivative Liability 42,554us-gaap_DerivativeLiabilities 16,211us-gaap_DerivativeLiabilities
Derivative Liability, Fair Value of Collateral (47,222)us-gaap_DerivativeLiabilityFairValueOfCollateral [3] (18,081)us-gaap_DerivativeLiabilityFairValueOfCollateral [3]
Derivative, Collateral, Right to Reclaim Cash 0us-gaap_DerivativeCollateralRightToReclaimCash [4] (8,033)us-gaap_DerivativeCollateralRightToReclaimCash [4]
Derivative Liability, Fair Value, Amount Offset Against Collateral $ (4,668)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral $ (9,903)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
[1] Consists of U.S. Treasury securities.
[2] Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[3] Included in other invested assets, primarily consists of U.S. Treasury securities.
[4] Consists of receivable from counterparty, included in other assets.