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Financial Condition and Net Income on a Statutory Basis - Significant Subs (Details 1) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Statutory Basis [Abstract]
Prescribed Practice Surplus Note	$ 230,291,000	$ 138,193,000
Prescribed Practice Letters Of Credit	(488,000,000)	(360,000,000)
Surplus Deficit NAIC SAP	$ (257,709,000)	$ (221,807,000)

X

- Definition

Represents letters of credit issued on behalf of the reporting company that are allowed as admitted assets under prescribed practices but not under NAIC SAP.

+ References

No definition available.

+ Details

Name:	rga_PrescribedPracticeLettersOfCredit
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents surplus of the reporting company, including accrued surplus note interest that is reported as a reduction in surplus under prescribed practices but not under NAIC SAP.

+ References

No definition available.

+ Details

Name:	rga_PrescribedPracticeSurplusNote
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	rga_StatutoryBasisAbstract
Namespace Prefix:	rga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of surplus or surplus deficit under NAIC SAP of certain subsidiaries with a state of domicile that follows prescribed practices.

+ References

No definition available.

+ Details

Name:	rga_SurplusDeficitNaicSap
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant