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Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) (Currency Swap [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Currency Swap [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives | $ 40,347 | [1],[2] | $ (20,470) | [1],[2] | $ 4,858 | [1],[2]
[1] | There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.
[2] | There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.

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- Definition The current period gain (loss) recognized in other comprehensive income related to the derivatives designated in cash flow hedges. + References No definition available. + Details
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Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration