XML 84 R69.htm IDEA: XBRL DOCUMENT
v3.20.4

Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 31,963 | $ 29,205
Available-for-sale Securities | $ 36,208 | $ 31,393
Percentage Of Total Available For Sales Securities | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 11,785 | $ 10,896
Available-for-sale Securities | $ 13,236 | $ 11,653
Percentage Of Total Available For Sales Securities | 36.60% | 37.20%
Commercial and Industrial Sector [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 16,274 | $ 14,692
Available-for-sale Securities | $ 18,435 | $ 15,803
Percentage Of Total Available For Sales Securities | 50.90% | 50.30%
Utility Industry [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 3,904 | $ 3,617
Available-for-sale Securities | $ 4,537 | $ 3,937
Percentage Of Total Available For Sales Securities | 12.50% | 12.50%

X
- References No definition available. + Details
Name: | rga_CorporateSecturitiesByInvestmentSectorAndCreditRatingLineItems
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_PercentageOfTotalAvailableForSalesSecurities
Namespace Prefix: | rga_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_CommercialAndIndustrialSectorMember
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: |