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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Narrative) (Details) | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value Disclosures [Abstract] |  |
Percentage Of Fixed Maturity Securities Classified As Level 3 | 8.80%rga_PercentageOfFixedMaturitySecuritiesClassifiedAsLevel3 | 8.80%rga_PercentageOfFixedMaturitySecuritiesClassifiedAsLevel3

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- Definition Percentage of fixed maturity securities classified as Level 3 + References No definition available. + Details
Name: | rga_PercentageOfFixedMaturitySecuritiesClassifiedAsLevel3
Namespace Prefix: | rga_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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