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Commitments Contingencies and Guarantees (Schedule of Line of Credit Facilities) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 836,500,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Syndicated Credit Facility $850 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 850,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_SyndicatedCreditFacility850MillionMember		  
Line of Credit Facility, Expiration Date Dec. 31, 2019  
Long-term Line of Credit 204,774,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_SyndicatedCreditFacility850MillionMember		 [1] 67,561,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_SyndicatedCreditFacility850MillionMember		 [1]
Credit Facility Basis Of Fees Senior unsecured long-term debt rating  
Credit Facility 120 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 120,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility120MillionMember		  
Line of Credit Facility, Expiration Date May 31, 2016  
Long-term Line of Credit 80,040,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility120MillionMember		 [1] 85,050,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility120MillionMember		 [1]
Credit Facility Basis Of Fees Fixed  
Credit Facility 270 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 270,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility270MillionMember		  
Line of Credit Facility, Expiration Date Nov. 30, 2017  
Long-term Line of Credit 270,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility270MillionMember		 [1] 270,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility270MillionMember		 [1]
Credit Facility Basis Of Fees Fixed  
Credit Facility 100 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility100MillionMember		  
Line of Credit Facility, Expiration Date Jun. 30, 2017  
Long-term Line of Credit 81,747,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility100MillionMember		 [1] 89,433,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility100MillionMember		 [1]
Credit Facility Basis Of Fees Fixed  
Credit Facility 58 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 74,623,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility58MillionMember		  
Line of Credit Facility, Expiration Date Nov. 30, 2014  
Long-term Line of Credit 74,623,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility58MillionMember		 [1] 58,351,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility58MillionMember		 [1]
Credit Facility Basis Of Fees Fixed  
Credit Facility 132 Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 80,961,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility132MillionMember		  
Line of Credit Facility, Expiration Date Mar. 31, 2019  
Long-term Line of Credit 80,961,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility132MillionMember		 [1] 132,534,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacility132MillionMember		 [1]
Credit Facility Basis Of Fees Fixed  
Credit Facility One Hundred Fifty Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_CreditFacilityOneHundredFiftyMillionMember		  
Line of Credit Facility, Expiration Date Jun. 30, 2016  
Long-term Line of Credit 130,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacilityOneHundredFiftyMillionMember		 [1] 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacilityOneHundredFiftyMillionMember		 [1]
Credit Facility Basis Of Fees Fixed  
Credit Facility Forty Seven Million [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 40,875,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rga_CreditFacilityFortySevenMillionMember		  
Line of Credit Facility, Expiration Date May 31, 2016  
Long-term Line of Credit $ 28,612,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacilityFortySevenMillionMember		 $ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= rga_CreditFacilityFortySevenMillionMember
Line of Credit Facility, Commitment Fee Description Fixed  
[1] Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.