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Financial Condition and Net Income on a Statutory Basis - Significant Subsidiaries (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Statutory Basis [Abstract]  
Number Of Preceeding Months To Accumulate Dividend Paid For Approval 12 months
Future Dividend Payment Restricted To Such Percent Of Surplus To Policy Holders 10.00%rga_FutureDividendPaymentRestrictedToSuchPercentOfSurplusToPolicyHolders
Day As Of Max Dividends Payable For RCM And RGA Reinsurance January 1, 2015
RGA Reinsurance Max Dividend Payments Without Approval $ 152.8rga_RgaReinsuranceMaxDividendPaymentsWithoutApproval