XML 113 R102.htm IDEA: XBRL DOCUMENT
v3.25.3

Commitments, Contingencies and Guarantees (Maximum Potential Obligation) (Details) $ in Millions | Sep. 30, 2025 USD ($)
--- | ---
Commitment Period Two Thousand Thirty Four [Member] |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1,243
Commitment Period Two Thousand Thirty Five [Member] |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 1,892
Commitment Period Two Thousand Thirty Six [Member] |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 2,349
Commitment Period Two Thousand Thirty Seven |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 5,100
Commitment Period Two Thousand Thirty Eight |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 1,750
Commitment Period Two Thousand Thirty Nine |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 8,751
Commitment Period Two Thousand Forty Six |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 3,000
Commitment Period Two Thousand Forty One |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 720
Commitment Period Two Thousand Forty Nine |
Other Commitments [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 4,750

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-4 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandThirtyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandThirtyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandThirtySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandThirtySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandThirtyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandThirtyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandFortySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandFortyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rga_CommitmentPeriodTwoThousandFortyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |