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Reinsurance (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Ceded Credit Risk [Line Items] |  |
Reinsurance Claims Recoverables | $ 216 | $ 278
Claims Recoverable From Retrocessionaires Past Due | $ 11 | $ 10
AM Best, A- Rating [Member] |  |
Ceded Credit Risk [Line Items] |  |
Ceded Credit Risk, Disclosure | “A- (excellent)” |

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- Definition Represents the amount of claims paid by the company and recoverable from retrocessionaires which is contractually past due in excess of 90 days. + References No definition available. + Details
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Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance. + References No definition available. + Details
Name: | rga_ReinsuranceClaimsRecoverables
Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of ceding entity's credit risk concentration associated with reinsurance recoverable and prepaid reinsurance premium. Includes, but is not limited to, concentration of activity, region, or economic characteristic. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=123600520&loc=SL75241803-196195 + Details
Name: | us-gaap_ConcentrationRiskCreditRiskReinsurance
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Period Type: | duration

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- Details
Name: | srt_CreditRatingAMBestAxis=srt_AMBestAMinusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |