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Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Derivatives, Fair Value [Line Items] |  |
Net Derivatives Gains (Losses) Deferred in AOCI | $ (16) | $ (15)
Currency Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Derivatives Gains (Losses) Deferred in AOCI | 0 | (1)
Foreign Currency Forwards |  |
Derivatives, Fair Value [Line Items] |  |
Net Derivatives Gains (Losses) Deferred in AOCI | $ (16) | $ (14)

X
- Definition The current period gain (loss) recognized in other comprehensive income related to the effective portion of derivatives designated in cash flow hedges. + References No definition available. + Details
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Namespace Prefix: | rga_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |