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Income Tax (Tax Effects of Temporary Differences that Give Rise to Significant Portions of the Deferred Income Tax Asset and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets, Net [Abstract]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals $ 118,389us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals $ 106,587us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Deferred Tax Assets Reinsurance Transactions 64,445rga_DeferredTaxAssetsReinsuranceTransactions 59,942rga_DeferredTaxAssetsReinsuranceTransactions
Deferred Tax Assets Cash And Invested Assets 0rga_DeferredTaxAssetsCashAndInvestedAssets 2,106rga_DeferredTaxAssetsCashAndInvestedAssets
Deferred Tax Assets Investment Income 56,176rga_DeferredTaxAssetsInvestmentIncome 108,462rga_DeferredTaxAssetsInvestmentIncome
Deferred Tax Assets Deferred Acquisition Costs Capitalized For Tax 92,832rga_DeferredTaxAssetsDeferredAcquisitionCostsCapitalizedForTax 90,187rga_DeferredTaxAssetsDeferredAcquisitionCostsCapitalizedForTax
Deferred Tax Assets, Operating Loss Carryforwards 170,965us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 252,192us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets Deferred Acquisition Costs Capitalized For Financial Reporting 26,365rga_DeferredTaxAssetsDeferredAcquisitionCostsCapitalizedForFinancialReporting 2,356rga_DeferredTaxAssetsDeferredAcquisitionCostsCapitalizedForFinancialReporting
Deferred Tax Assets, Gross 529,172us-gaap_DeferredTaxAssetsGross 621,832us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (112,005)us-gaap_DeferredTaxAssetsValuationAllowance (102,228)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net 417,167us-gaap_DeferredTaxAssetsNet 519,604us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities [Abstract]    
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost 961,170us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost 1,066,351us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost
Deferred Tax Liabilities Reinsurance Transactions 1,044,097rga_DeferredTaxLiabilitiesReinsuranceTransactions 906,197rga_DeferredTaxLiabilitiesReinsuranceTransactions
Deferred Tax Liabilities Cash And Invested Assets 667,601rga_DeferredTaxLiabilitiesCashAndInvestedAssets 310,332rga_DeferredTaxLiabilitiesCashAndInvestedAssets
Deferred Tax Liabilities Investment Income 8,187rga_DeferredTaxLiabilitiesInvestmentIncome 12,959rga_DeferredTaxLiabilitiesInvestmentIncome
Deferred Tax Liabilities, Unrealized Currency Transaction Gains 64,115us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains 19,704us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Deferred Tax Liabilities 2,745,170us-gaap_DeferredTaxLiabilities 2,315,543us-gaap_DeferredTaxLiabilities
Net deferred income tax liabilities 2,328,003us-gaap_DeferredTaxAssetsLiabilitiesNet 1,795,939us-gaap_DeferredTaxAssetsLiabilitiesNet
Balance Sheet Presentation Of Deferred Tax Liabilities [Abstract]    
Deferred Tax Assets, Other 37,814us-gaap_DeferredTaxAssetsOther 41,638us-gaap_DeferredTaxAssetsOther
Deferred income taxes $ 2,365,817us-gaap_DeferredIncomeTaxLiabilities $ 1,837,577us-gaap_DeferredIncomeTaxLiabilities