XML 100 R85.htm IDEA: XBRL DOCUMENT
v3.20.4

Investments (Other Invested Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Investments [Abstract] |  |
Other invested assets | $ 2,829 | $ 2,363
Limited Partner [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 1,367 | 1,134
Gain (Loss) on Derivatives [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 140 | 117
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 289 | 260
Other [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 98 | 77
Equity Release Mortgages [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | $ 935 | $ 775

X
- Definition Amount of investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OtherInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | rga_OtherInvestedAssetsAxis=us-gaap_LimitedPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_OtherInvestedAssetsAxis=us-gaap_DerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_OtherInvestedAssetsAxis=rga_FairValueOptionContractholderDirectedUnitLinkedInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_OtherInvestedAssetsAxis=us-gaap_OtherCreditDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rga_EquityReleaseMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |