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Financial Condition and Net Income on a Statutory Basis - Significant Subs (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance $ 35,000,000    
Number Of Preceeding Months To Accumulate Dividend Paid For Approval 12    
Future Dividend Payment Restricted To Such Percent Of Surplus To Policy Holders 10.00%    
RCM [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 1,692,200,000 1,478,864,000  
Statutory Accounting Practices, Statutory Net Income Amount 58,549,000 37,142,000 53,690,000
RGA Reinsurance [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 1,644,589,000 1,515,934,000  
Statutory Accounting Practices, Statutory Net Income Amount 3,497,000 129,717,000 68,010,000
RGA Canada [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 725,738,000 610,142,000  
Statutory Accounting Practices, Statutory Net Income Amount 95,861,000 102,229,000 68,561,000
RGA Barbados [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 593,048,000 492,948,000  
Statutory Accounting Practices, Statutory Net Income Amount 78,263,000 149,015,000 98,697,000
RGA Australia [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 429,042,000 385,171,000  
Statutory Accounting Practices, Statutory Net Income Amount 36,653,000 47,211,000 31,897,000
RGA Atlantic [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 426,326,000 328,491,000  
Statutory Accounting Practices, Statutory Net Income Amount 68,306,000 70,160,000 78,227,000
RGA Americas [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 307,631,000 255,259,000  
Statutory Accounting Practices, Statutory Net Income Amount 40,520,000 65,283,000 45,281,000
Other Reinsurance Subsidiaries [Member]
      
Statutory Accounting Practices [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 811,684,000 620,790,000  
Statutory Accounting Practices, Statutory Net Income Amount $ (442,414,000) $ (439,625,000) $ 80,287,000