XML 110 R93.htm IDEA: XBRL DOCUMENT v3.21.1

New Accounting Standards (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of New Accounting Standard Current Expected Credit Losses	$ 15

X

- Definition

Adoption of New Accounting Standard Current Expected Credit Losses

+ References

No definition available.

+ Details

Name:	rga_AdoptionofNewAccountingStandardCurrentExpectedCreditLosses
Namespace Prefix:	rga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: