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Income Tax Income Tax (Provision for Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 64,444us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 69,804us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount (5,517)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (3,221)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Income Tax Reconciliation Foreign Income Tax Basis Differential (6,670)rga_IncomeTaxReconciliationForeignIncomeTaxBasisDifferential 250rga_IncomeTaxReconciliationForeignIncomeTaxBasisDifferential
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 6,791us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (3,157)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount 952us-gaap_IncomeTaxReconciliationTaxContingenciesDomestic 778us-gaap_IncomeTaxReconciliationTaxContingenciesDomestic
Income Tax Reconciliation Change In Foreign Enacted Tax Rate 272rga_IncomeTaxReconciliationChangeInForeignEnactedTaxRate (17)rga_IncomeTaxReconciliationChangeInForeignEnactedTaxRate
Income Tax Reconciliation SubpartF 6,434rga_IncomeTaxReconciliationSubpartF 2,439rga_IncomeTaxReconciliationSubpartF
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount (2,343)us-gaap_IncomeTaxReconciliationTaxCreditsForeign (855)us-gaap_IncomeTaxReconciliationTaxCreditsForeign
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount (4,765)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes (3,353)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount (587)us-gaap_IncomeTaxReconciliationOtherAdjustments 108us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Expense (Benefit) $ 59,011us-gaap_IncomeTaxExpenseBenefit $ 62,776us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent 32.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 31.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations