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Commitments and Contingent Liabilities (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Credit Facility 850 Million [Member] |  |
Line Of Credit Facility [Line Items] |  |
Credit Facility Maturity Date | December 2015 |
Credit Facility Basis Of Fees | Senior unsecured long-term debt rating |
Credit Facility Amount Utilized | $ 140,000 | $ 402,900
Credit Facility 200 Million [Member] |  |
Line Of Credit Facility [Line Items] |  |
Credit Facility Maturity Date | September 2019 |
Credit Facility Basis Of Fees | Fixed |
Credit Facility Amount Utilized | 200,000 | 200,000
Credit Facility 120 Million [Member] |  |
Line Of Credit Facility [Line Items] |  |
Credit Facility Maturity Date | May 2016 |
Credit Facility Basis Of Fees | Fixed |
Credit Facility Amount Utilized | 100,000 | 100,000
Credit Facility 270 Million [Member] |  |
Line Of Credit Facility [Line Items] |  |
Credit Facility Maturity Date | November 2017 |
Credit Facility Basis Of Fees | Fixed |
Credit Facility Amount Utilized | $ 270,000 | $ 0

X
- Definition This element represents the amount of issued but undrawn letters of credit or cash borrowings made utilizing the credit facility. + References No definition available. + Details
Name: | rga_CreditFacilityAmountUtilized
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the basis upon which facility fees are charged for maintaining the credit facility. + References No definition available. + Details
Name: | rga_CreditFacilityBasisOfFees
Namespace Prefix: | rga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the scheduled maturity date of the credit facility. + References No definition available. + Details
Name: | rga_CreditFacilityMaturityDate
Namespace Prefix: | rga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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