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

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- 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. + Details
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- 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 + Details
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