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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities Sold under Agreements to Repurchase	$ 91,875us-gaap_SecuritiesSoldUnderAgreementsToRepurchase	$ 92,446us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	108,268us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	107,158us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral
Securities for Reverse Repurchase Agreements	298,625us-gaap_SecuritiesForReverseRepurchaseAgreements	298,466us-gaap_SecuritiesForReverseRepurchaseAgreements
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	346,560us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	338,929us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	193,840us-gaap_SecuritiesBorrowed / rga_AvailableForSaleSecuritiesAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	201,050us-gaap_SecuritiesBorrowed / rga_AvailableForSaleSecuritiesAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	207,476us-gaap_SecuritiesBorrowed / rga_AvailableForSaleSecuritiesAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	212,946us-gaap_SecuritiesBorrowed / rga_AvailableForSaleSecuritiesAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Securities for Reverse Repurchase Agreements	$ 317,368us-gaap_SecuritiesForReverseRepurchaseAgreements / rga_AvailableForSaleSecuritiesAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	$ 314,160us-gaap_SecuritiesForReverseRepurchaseAgreements / rga_AvailableForSaleSecuritiesAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of right to receive securities collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase.

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Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

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