XML 80 R65.htm IDEA: XBRL DOCUMENT
v3.20.4

Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 31,963 | $ 29,205
Available-for-sale Securities | 36,208 | 31,393
Financing Receivable, Allowance for Credit Loss | 20 |
Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 49,548 | 46,753
Available-for-sale Securities, Gross Unrealized Gains | 7,404 | 4,478
Available-for-sale Securities, Gross Unrealized Losses | 197 | 110
Available-for-sale Securities | $ 56,735 | $ 51,121
Percentage Of Total Available For Sale Securities | 100.00% | 100.00%
Financing Receivable, Allowance for Credit Loss | $ 20 |
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 31,963 | $ 29,205
Available-for-sale Securities, Gross Unrealized Gains | 4,356 | 2,269
Available-for-sale Securities, Gross Unrealized Losses | 94 | 81
Available-for-sale Securities | $ 36,208 | $ 31,393
Percentage Of Total Available For Sale Securities | 63.90% | 61.40%
Financing Receivable, Allowance for Credit Loss | $ 17 |
Canadian Provincial Governments [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 3,145 | $ 3,016
Available-for-sale Securities, Gross Unrealized Gains | 1,995 | 1,596
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 5,140 | $ 4,612
Percentage Of Total Available For Sale Securities | 9.10% | 9.00%
Financing Receivable, Allowance for Credit Loss | $ 0 |
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,735 | $ 2,339
Available-for-sale Securities, Gross Unrealized Gains | 84 | 62
Available-for-sale Securities, Gross Unrealized Losses | 2 | 3
Available-for-sale Securities | $ 1,817 | $ 2,398
Percentage Of Total Available For Sale Securities | 3.20% | 4.70%
Financing Receivable, Allowance for Credit Loss | $ 0 |
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 3,099 | $ 2,973
Available-for-sale Securities, Gross Unrealized Gains | 35 | 19
Available-for-sale Securities, Gross Unrealized Losses | 42 | 14
Available-for-sale Securities | $ 3,092 | $ 2,978
Percentage Of Total Available For Sale Securities | 5.40% | 5.80%
Financing Receivable, Allowance for Credit Loss | $ 0 |
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,790 | $ 1,841
Available-for-sale Securities, Gross Unrealized Gains | 102 | 61
Available-for-sale Securities, Gross Unrealized Losses | 21 | 3
Available-for-sale Securities | $ 1,868 | $ 1,899
Percentage Of Total Available For Sale Securities | 3.30% | 3.70%
Financing Receivable, Allowance for Credit Loss | $ 3 |
US Treasury and Government [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,242 | $ 2,096
Available-for-sale Securities, Gross Unrealized Gains | 196 | 57
Available-for-sale Securities, Gross Unrealized Losses | 1 | 1
Available-for-sale Securities | $ 1,437 | $ 2,152
Percentage Of Total Available For Sale Securities | 2.50% | 4.20%
Financing Receivable, Allowance for Credit Loss | $ 0 |
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,237 | $ 1,074
Available-for-sale Securities, Gross Unrealized Gains | 157 | 93
Available-for-sale Securities, Gross Unrealized Losses | 4 | 3
Available-for-sale Securities | $ 1,390 | $ 1,164
Percentage Of Total Available For Sale Securities | 2.40% | 2.30%
Financing Receivable, Allowance for Credit Loss | $ 0 |
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 5,337 | $ 4,209
Available-for-sale Securities, Gross Unrealized Gains | 479 | 321
Available-for-sale Securities, Gross Unrealized Losses | 33 | 5
Available-for-sale Securities | $ 5,783 | $ 4,525
Percentage Of Total Available For Sale Securities | 10.20% | 8.90%
Financing Receivable, Allowance for Credit Loss | $ 0 |

X
- Definition Percentage of available for sale securities + References No definition available. + Details
Name: | rga_PercentageOfTotalAvailableForSaleSecurities
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 Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
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
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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

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

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

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

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