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Investments (Mortgage Loans by Property Type) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 2,919,616us-gaap_LoansReceivableCommercialRealEstate	$ 2,718,709us-gaap_LoansReceivableCommercialRealEstate
Percentage of total	100.00%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal	100.00%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal
Apartment
Mortgage Loans on Real Estate [Line Items]
Recorded investment	404,174us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember	376,430us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember
Percentage of total	13.80%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember	13.80%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ApartmentBuildingMember
Retail
Mortgage Loans on Real Estate [Line Items]
Recorded investment	890,080us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember	802,466us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember
Percentage of total	30.50%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember	29.60%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember
Office building
Mortgage Loans on Real Estate [Line Items]
Recorded investment	937,939us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember	851,749us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Percentage of total	32.20%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember	31.30%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Industrial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	474,310us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember	466,583us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Percentage of total	16.20%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember	17.20%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_IndustrialPropertyMember
Other commercial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 213,113us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OtherPropertyMember	$ 221,481us-gaap_LoansReceivableCommercialRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OtherPropertyMember
Percentage of total	7.30%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OtherPropertyMember	8.10%rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OtherPropertyMember

X

- Definition

The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

No definition available.

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X

- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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