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Investments (Impaired Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | $ 17,523 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance |  |  |  | $ 17,593 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Recorded Investment | 16,956 us-gaap_ImpairedFinancingReceivableRecordedInvestment |  |  |  | 17,027 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Related Allowance | 713 us-gaap_ImpairedFinancingReceivableRelatedAllowance |  |  |  | 816 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Carrying Value | 16,243 rga_ImpairedFinancingReceivableNetOfRelatedAllowance |  |  |  | 16,211 rga_ImpairedFinancingReceivableNetOfRelatedAllowance
Average Investment | 16,992 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | [1] | 35,093 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | [1] |
Interest Income | 261 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod |  | 511 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod |  |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 10,227 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember |  |  |  | 10,279 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember
Recorded Investment | 10,263 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember |  |  |  | 10,316 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember
Related Allowance | 713 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember |  |  |  | 816 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember
Carrying Value | 9,550 rga_ImpairedFinancingReceivableNetOfRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember |  |  |  | 9,500 rga_ImpairedFinancingReceivableNetOfRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember
Average Investment | 6,702 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember | [1] | 20,554 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember | [1] |
Interest Income | 155 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember |  | 193 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithRelatedAllowanceMember |  |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 7,296 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember |  |  |  | 7,314 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember
Recorded Investment | 6,693 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember |  |  |  | 6,711 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember
Related Allowance | 0 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember |  |  |  | 0 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember
Carrying Value | 6,693 rga_ImpairedFinancingReceivableNetOfRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember |  |  |  | 6,711 rga_ImpairedFinancingReceivableNetOfRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember
Average Investment | 10,290 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember | [1] | 14,539 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember | [1] |
Interest Income | $ 106 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember |  | $ 318 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rga_CommercialRealEstateOtherReceivableWithNoRelatedAllowanceMember |  |
[1] | Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

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