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Reinsurance Reinsurance (Ceded Reinsurance Receivable Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 578,206us-gaap_ReinsuranceRecoverables	$ 594,515us-gaap_ReinsuranceRecoverables
Reinsurance Recoverables, Percentage of Total	100.00%us-gaap_ReinsuranceRecoverablesPercentageOfTotal	100.00%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
Other Reinsurers [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	160,285us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_OtherReinsurersMember	173,000us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_OtherReinsurersMember
Reinsurance Recoverables, Percentage of Total	27.60%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_OtherReinsurersMember	29.10%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_OtherReinsurersMember
AM Best, A+ Rating [Member] | Reinsurer A [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	210,996us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerAMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember	220,797us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerAMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember
Reinsurance Recoverables, Percentage of Total	36.50%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerAMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember	37.10%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerAMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember
AM Best, A+ Rating [Member] | Reinsurer B [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	74,412us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerBMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember	70,579us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerBMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember
Reinsurance Recoverables, Percentage of Total	12.90%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerBMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember	11.90%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerBMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember
AM Best, A+ Rating [Member] | Reinsurer C [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	45,541us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerCMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember	43,835us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerCMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember
Reinsurance Recoverables, Percentage of Total	7.90%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerCMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember	7.40%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerCMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusRatingMember
AM Best, A Rating [Member] | Reinsurer D [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	43,818us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerDMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember	46,420us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerDMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember
Reinsurance Recoverables, Percentage of Total	7.60%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerDMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember	7.80%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerDMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember
AM Best, A++ Rating [Member] | Reinsurer E [Member]
Ceded Credit Risk [Line Items]
Reinsurance ceded receivables	$ 43,154us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerEMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusPlusRatingMember	$ 39,884us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = rga_ReinsurerEMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusPlusRatingMember
Reinsurance Recoverables, Percentage of Total	7.50%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerEMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusPlusRatingMember	6.70%us-gaap_ReinsuranceRecoverablesPercentageOfTotal / us-gaap_CededCreditRiskAxis = rga_ReinsurerEMember / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestAPlusPlusRatingMember

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- Definition

Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387



Reference 3: 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.(a),6)

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

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- Definition

Percentage of total reinsurance recoverables.

+ References

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