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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI) (Details) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Investment related gains (losses), net

$ 10,110us-gaap_GainLossOnSaleOfOtherInvestments

$ 84,874us-gaap_GainLossOnSaleOfOtherInvestments

Investment income

426,891us-gaap_NetInvestmentIncome

404,375us-gaap_NetInvestmentIncome

Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest

184,125us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

199,440us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

Income Tax Expense (Benefit)

(59,011)us-gaap_IncomeTaxExpenseBenefit

(62,776)us-gaap_IncomeTaxExpenseBenefit

Net income

125,114us-gaap_NetIncomeLoss

136,664us-gaap_NetIncomeLoss

Unrealized Appreciation Depreciation Of Investments [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest

8,252us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember

5,828us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember

Income Tax Expense (Benefit)

(860)us-gaap_IncomeTaxExpenseBenefit
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember

(1,904)us-gaap_IncomeTaxExpenseBenefit
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember

Net income

7,392us-gaap_NetIncomeLoss
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember

3,924us-gaap_NetIncomeLoss
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember

Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Investment related gains (losses), net

3,079us-gaap_GainLossOnSaleOfOtherInvestments
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember
/ rga_UnrealizedGainLossReclassAxis
= rga_UnrealizedGainsLossesOnAvailableForSaleSecuritiesMember

1,189us-gaap_GainLossOnSaleOfOtherInvestments
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember
/ rga_UnrealizedGainLossReclassAxis
= rga_UnrealizedGainsLossesOnAvailableForSaleSecuritiesMember

Unrealized Appreciation Depreciation Of Investments [Member] | Gains Losses On Qualifying Cash Flow Hedging Instruments [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Investment income

840us-gaap_NetInvestmentIncome
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember
/ rga_UnrealizedGainLossReclassAxis
= rga_GainsLossesOnQualifyingCashFlowHedgingInstrumentsMember

218us-gaap_NetInvestmentIncome
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember
/ rga_UnrealizedGainLossReclassAxis
= rga_GainsLossesOnQualifyingCashFlowHedgingInstrumentsMember

Unrealized Appreciation Depreciation Of Investments [Member] | DAC Attributed To Unrealized Gains Losses [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Deferred policy acquisition costs attributed to unrealized gains and losses

4,333us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember
/ rga_UnrealizedGainLossReclassAxis
= rga_DacAttributedToUnrealizedGainsLossesMember

^[1]

4,421us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses
/ rga_AociComponentsAxis
= rga_UnrealizedAppreciationDepreciationOfInvestmentsMember
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= rga_DacAttributedToUnrealizedGainsLossesMember

^[1]

Amortization Of Unrealized Pension And Postretirement Benefits [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest

(787)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember

(892)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember

Income Tax Expense (Benefit)

275us-gaap_IncomeTaxExpenseBenefit
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember

312us-gaap_IncomeTaxExpenseBenefit
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember

Net income

(512)us-gaap_NetIncomeLoss
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember

(580)us-gaap_NetIncomeLoss
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember

Amounts Reclassified From AOCI [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Net income

6,880us-gaap_NetIncomeLoss
/ rga_AociComponentsAxis
= rga_AmountsReclassifiedFromAociMember

3,344us-gaap_NetIncomeLoss
/ rga_AociComponentsAxis
= rga_AmountsReclassifiedFromAociMember

Prior Service Cost [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Prior service cost

(83)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember
/ rga_PensionAndPostretirementBenefitsAxis
= rga_PriorServiceCostMember

^[2]

(2)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember
/ rga_PensionAndPostretirementBenefitsAxis
= rga_PriorServiceCostMember

^[2]

Actuarial Gains Losses [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]

Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]

Actuarial gains/(losses)

$ (704)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember
/ rga_PensionAndPostretirementBenefitsAxis
= rga_ActuarialGainsLossesMember

^[2]

$ (890)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ rga_AociComponentsAxis
= rga_AmortizationOfUnrealizedPensionAndPostretirementBenefitsMember
/ rga_PensionAndPostretirementBenefitsAxis
= rga_ActuarialGainsLossesMember

^[2]

[1]	This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2014 Annual Report for additional details.
[2]	These AOCI components are included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional details.

X

- Definition

Amount of increase (decrease) in deferred policy acquisition cost (DAC) due to unrealized investment gain (loss).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 30

-Section 50

-Paragraph 1

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X

- Definition

The difference between the book value and the sale price of other nonspecific investments. This element is used when other, more specific, elements are not appropriate. This element refers to the gain (loss) included in earnings.

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X

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Glossary Income Tax Expense (or Benefit)

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-Paragraph 9

-Subparagraph (a),(b)

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X

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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