XML 92 R79.htm IDEA: XBRL DOCUMENT
v3.23.1

Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 61,494 |  | $ 59,663 |
Fixed maturity securities, available-for-sale | 56,085 | [1] | 52,901 | [2]
Corporate Debt Securities [Member] |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | 39,621 |  | 38,963 |
Fixed maturity securities, available-for-sale | $ 35,477 | [1] | $ 33,969 | [2]
% of Total | 100.00% |  | 100.00% |
Corporate Debt Securities [Member] | Finance |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 14,732 |  | $ 14,551 |
Fixed maturity securities, available-for-sale | $ 13,043 |  | $ 12,680 |
% of Total | 36.80% |  | 37.30% |
Corporate Debt Securities [Member] | Industrial |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 19,945 |  | $ 19,624 |
Fixed maturity securities, available-for-sale | $ 18,108 |  | $ 17,257 |
% of Total | 51.00% |  | 50.80% |
Corporate Debt Securities [Member] | Utility |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 4,944 |  | $ 4,788 |
Fixed maturity securities, available-for-sale | $ 4,326 |  | $ 4,032 |
% of Total | 12.20% |  | 11.90% |
[1] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of March 31, 2023, the fair value of such investments was $726 million.
[2] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | rga_CorporateSecuritiesByInvestmentSectorAndCreditRatingLineItems
Namespace Prefix: | rga_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of available for sale securities + References No definition available. + Details
Name: | rga_PercentageOfTotalAvailableForSaleSecurities
Namespace Prefix: | rga_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=rga_FinanceIndustryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=rga_IndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=rga_UtilityIndustryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |