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Commitments and Contingent Liabilities (Credit Facility) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Credit Facility One Hundred Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 100,000 |  |
Maturity Date |  | June 2016 |  |
Amount Utilized | [1] | $ 71,364 |  | $ 81,747
Basis Of Fees |  | Fixed |  |
Credit Facility Fifty Three Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [2] | $ 76,310 |  |
Maturity Date |  | November 2015 |  |
Amount Utilized | [1] | $ 73,200 |  | 74,623
Basis Of Fees |  | Fixed |  |
Credit Facility 270 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 270,000 |  |
Maturity Date |  | November 2017 |  |
Amount Utilized | [1] | $ 270,000 |  | 270,000
Basis Of Fees |  | Fixed |  |
Credit Facility 120 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 120,000 |  |
Maturity Date |  | June 2019 |  |
Amount Utilized | [1] | $ 80,040 |  | 80,040
Basis Of Fees |  | Fixed |  |
Credit Facility 850 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 850,000 |  |
Maturity Date |  | September 2019 |  |
Amount Utilized |  | $ 297,890 | [1] | 204,774
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 | [2] | $ 38,535 |  |
Maturity Date |  | March 2019 |  |
Amount Utilized | [1] | $ 53,030 |  | 80,961
Basis Of Fees |  | Fixed |  |
Credit Facility Forty Seven Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [2] | $ 51,892 |  |
Maturity Date |  | May 2018 |  |
Amount Utilized | [1] | $ 35,090 |  | $ 28,612
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, amounts presented are in U.S. dollars.

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

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=rga_CreditFacilityOneHundredMillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=rga_CreditFacilityDueNovemberTwoThousandFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=rga_CreditFacility270MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=rga_CreditFacility120MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=rga_CreditFacility850MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=rga_CreditFacilityVariableDueMarchTwoThousandNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=rga_CreditFacilityVariableDueMayTwoThousandSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |