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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Narrative) (Details)	Mar. 31, 2015	Dec. 31, 2014
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

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Namespace Prefix:	rga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration