XML 47 R58.htm IDEA: XBRL DOCUMENT
v3.19.3

Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Document Period End Date | Sep. 30, 2019 |
Financing Receivable, before Allowance for Credit Loss | $ 5,667,354 | $ 4,983,354
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Due within five years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,750,771 | $ 1,425,598
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 30.90% | 28.60%
Due after five years through ten years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,001,527 | $ 2,686,264
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 53.00% | 53.90%
Due after ten years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 915,056 | $ 871,492
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 16.10% | 17.50%

X
- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
Name: | dei_DocumentPeriodEndDate
Namespace Prefix: | dei_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
Name: | rga_MortgageLoansOnRealEstateCommercialAndConsumerNetPercentageOfTotal
Namespace Prefix: | rga_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | rga_MortgageLoanMaturityAxis=rga_MortgageLoansOnRealEstateDueOneYearThroughFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_MortgageLoanMaturityAxis=rga_MortgageLoansOnRealEstateDueAfterFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rga_MortgageLoanMaturityAxis=rga_MortgageLoansOnRealEstateDueAfterTenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |