XML 103 R92.htm IDEA: XBRL DOCUMENT
v3.25.3

Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | [1] |  | $ (8) | $ (2)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] |  | $ 6,238 | 2,661
Derivative Average Remaining Maturity | [1],[3] | 6 years 9 months 18 days | 6 years 2 months 12 days |
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | [1] |  | $ (12) | (5)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] |  | $ 490 | 410
Derivative Average Remaining Maturity | [1],[3] | 17 years 6 months | 14 years 4 months 24 days |
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | [1] |  | $ 2 | 3
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] |  | $ 180 | 150
Derivative Average Remaining Maturity | [1],[3] | 2 years 3 months 18 days | 2 years 2 months 12 days |
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | [1] |  | $ 2 | 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] |  | $ 5,553 | 2,086
Derivative Average Remaining Maturity | [1],[3] | 5 years 1 month 6 days | 5 years 8 months 12 days |
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | [1] |  | $ 4 | 3
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] |  | $ 5,733 | 2,236
Derivative Average Remaining Maturity | [1],[3] | 4 years 10 months 24 days | 5 years 6 months |
Standard & Poor's, BB Rating [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Derivative Average Remaining Maturity | [1],[2] | 1 year 6 months | 8 months 12 days |
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | [1] |  | $ 0 | 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] |  | $ 5 | 5
Standard & Poor's, B Rating |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Derivative Average Remaining Maturity | [3] | 1 year 2 months 12 days | 6 months |
Standard & Poor's, B Rating | Single Name Credit Default Swaps [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | [1] |  | $ 0 | 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [2] |  | $ 10 | $ 10
[1] | ating agency designations are based on ratings from Standard and Poor’s (“S&P”) when available. Other credited rating agencies or internal ratings may be used when S&P ratings are not available.
[2] | Assumes the value of the referenced credit obligations is zero.
[3] | The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

X
- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K + Details
Name: | us-gaap_CreditDerivativeMaximumExposureUndiscounted
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4L -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4L Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K + Details
Name: | us-gaap_CreditDerivativesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K + Details
Name: | us-gaap_CreditRiskDerivativesAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageRemainingMaturity1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=rga_StandardPoorsAaaToAminusRatingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_CreditDefaultTypesAxis=rga_SingleNameCreditDefaultSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_CreditDefaultTypesAxis=rga_CreditDefaultSwapsReferencingIndicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_CreditDefaultTypesAxis=rga_CreditDefaultSubtotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |