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Financial Condition and Net Income on a Statutory Basis - Significant Subsidiaries (Reconciliation of NAIC SAP and Prescribed Practice) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statutory Basis [Abstract]
Prescribed Practice Surplus Note	$ 624,266	$ 726,531
Prescribed Practice Letters Of Credit	(976,100)	(960,100)
Surplus Deficit NAIC SAP	$ (351,834)	$ (233,569)

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

- References

No definition available.

+ 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