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Commitments and Contingent Liabilities (Credit Facility) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 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 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacilityOneHundredMillionMember |  |  |
Maturity Date | June 2017 |  |  |
Amount Utilized | 74,898 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityOneHundredMillionMember | [1] | 81,747 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityOneHundredMillionMember | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility Fifty Three Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 77,259 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacilityDueNovemberTwoThousandFifteenMember | [2] |  |
Maturity Date | November 2015 |  |  |
Amount Utilized | 77,259 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityDueNovemberTwoThousandFifteenMember | [1] | 74,623 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityDueNovemberTwoThousandFifteenMember | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 270 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 270,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacility270MillionMember |  |  |
Maturity Date | November 2017 |  |  |
Amount Utilized | 270,000 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacility270MillionMember | [1] | 270,000 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacility270MillionMember | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 120 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 120,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacility120MillionMember |  |  |
Maturity Date | May 2016 |  |  |
Amount Utilized | 80,040 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacility120MillionMember | [1] | 80,040 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacility120MillionMember | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility 850 Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 850,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacility850MillionMember |  |  |
Maturity Date | September 2019 |  |  |
Amount Utilized | 577,157 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacility850MillionMember | [1] | 204,774 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacility850MillionMember |
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 | 38,035 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacilityVariableDueMarchTwoThousandNineteenMember | [2] |  |
Maturity Date | March 2019 |  |  |
Amount Utilized | 63,174 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityVariableDueMarchTwoThousandNineteenMember | [1] | 80,961 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityVariableDueMarchTwoThousandNineteenMember | [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 | 150,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacilityOneHundredFiftyMillionMember |  |  |
Maturity Date | June 2016 |  |  |
Amount Utilized | 130,000 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityOneHundredFiftyMillionMember | [1] | 130,000 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityOneHundredFiftyMillionMember | [1]
Basis Of Fees | Fixed |  |  |
Credit Facility Forty Seven Million [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 63,174 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = rga_CreditFacilityVariableDueMayTwoThousandSixteenMember | [2] |  |
Maturity Date | May 2016 |  |  |
Amount Utilized | $ 26,625 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityVariableDueMayTwoThousandSixteenMember | [1] | $ 28,612 rga_CreditFacilityAmountUtilized / us-gaap_CreditFacilityAxis = rga_CreditFacilityVariableDueMayTwoThousandSixteenMember | [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, 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

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

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

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

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

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

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

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

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

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