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Financial Condition and Net Income on a Statutory Basis - Significant Subsidiaries (Statutory Accounting Practices Disclosure) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
RGA Reinsurance [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 3,206 | $ 2,516 |
Statutory Accounting Practices, Statutory Net Income Amount | 157 | 5 | $ (13)
RGA Canada [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,303 | 1,241 |
Statutory Accounting Practices, Statutory Net Income Amount | 38 | (7) | 25
RGA Barbados [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,621 | 1,466 |
Statutory Accounting Practices, Statutory Net Income Amount | 133 | (143) | 115
RGA Australia [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 475 | 729 |
Statutory Accounting Practices, Statutory Net Income Amount | 68 | 4 | (307)
RGA Atlantic [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 718 | 439 |
Statutory Accounting Practices, Statutory Net Income Amount | 21 | 44 | 15
RGA International Reinsurance Company dac [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 456 | 403 |
Statutory Accounting Practices, Statutory Net Income Amount | 52 | (67) | (22)
RGA Americas [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 2,437 | 2,262 |
Statutory Accounting Practices, Statutory Net Income Amount | 483 | (332) | (98)
Other Reinsurance Subsidiaries [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,559 | 1,261 |
Statutory Accounting Practices, Statutory Net Income Amount | 119 | 295 | (109)
RGA Worldwide Reinsurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 641 | 639 |
Statutory Accounting Practices, Statutory Net Income Amount | 64 | 8 | 10
RGA Global Reinsurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 561 | 409 |
Statutory Accounting Practices, Statutory Net Income Amount | (22) | 0 | 93
RGA Life and Annuity Insurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 4,304 | 1,607 |
Statutory Accounting Practices, Statutory Net Income Amount | $ 657 | $ (441) | $ (241)

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479989/944-505-50-1 + Details
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