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Commitments and Contingent Liabilities (Credit Facility) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Credit Facility One Hundred Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 100.0 |  |  |
Maturity Date | June 2017 |  |  |
Amount Utilized | 85 | [1] | 89 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility Fifty Three Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 79.0 | [2] |  |
Maturity Date | November 2014 |  |  |
Amount Utilized | 79 | [1] | 58 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 270 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 270.0 |  |  |
Maturity Date | November 2017 |  |  |
Amount Utilized | 270 | [1] | 270 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 120 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 120.0 |  |  |
Maturity Date | May 2016 |  |  |
Amount Utilized | 80 | [1] | 85 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 200 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 200.0 |  |  |
Maturity Date | September 2019 |  |  |
Amount Utilized | 200 | [1] | 200 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 850 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 850.0 |  |  |
Maturity Date | September 2019 |  |  |
Amount Utilized | 178 | [1] | 68 | [3]
Basis Of Fees | Senior unsecured long-term debt rating |  |  |
Credit Facility One Hundred Fifty Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 97.0 | [2] |  |
Maturity Date | March 2019 |  |  |
Amount Utilized | 97 | [1] | 133 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility One Hundred Fifty Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 150.0 |  |  |
Maturity Date | June 2016 |  |  |
Amount Utilized | 150 | [1] | 0 | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility Forty Seven Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 44.0 | [2] |  |
Maturity Date | May 2016 |  |  |
Amount Utilized | $ 0 | [1] | $ 0 | [1]
Basis Of Fees | Fixed |  |  |
[1] | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
[2] | Foreign currency facility, U.S. dollar amount may vary.
[3] | Represents amount under expired syndicated credit facility.

X
- 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

X
- 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

X
- 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

X
- 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