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Commitments and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Credit Facility One Hundred Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Facility Capacity | $ 100.0 |  |  |
Maturity Date | June 2017 |  |  |
Amount Utilized | 90.3 | [1] | 0 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 270 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Facility Capacity | 270.0 |  |  |
Maturity Date | November 2017 |  |  |
Amount Utilized | 270.0 | [1] | 0 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 120 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Facility Capacity | 120.0 |  |  |
Maturity Date | May 2016 |  |  |
Amount Utilized | 80.0 | [1] | 100.0 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 200 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Facility Capacity | 200.0 |  |  |
Maturity Date | September 2019 |  |  |
Amount Utilized | 200.0 | [1] | 200.0 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 850 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Facility Capacity | 850.0 |  |  |
Maturity Date | December 2015 |  |  |
Amount Utilized | $ 94.2 | [1] | $ 402.9 | [1]
Basis Of Fees | Senior unsecured long-term debt rating |  |  |
[1] | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

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- Definition This element represents the amount of issued but undrawn letters of credit or cash borrowings made utilizing the credit facility. + References No definition available. + Details
Name: | rga_CreditFacilityAmountUtilized
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the scheduled maturity date of the credit facility. + References No definition available. + Details
Name: | rga_CreditFacilityMaturityDate
Namespace Prefix: | rga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of the fees for amounts available, but unused under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeeDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant