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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
RGA Reinsurance [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 2,368 | $ 2,131 |
Statutory Accounting Practices, Statutory Net Income Amount | (98) | (133) | $ 280
RGA Canada [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 903 | 886 |
Statutory Accounting Practices, Statutory Net Income Amount | 25 | 152 | (225)
RGA Barbados [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,781 | 1,835 |
Statutory Accounting Practices, Statutory Net Income Amount | 52 | 268 | 234
RGA Australia [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 485 | 535 |
Statutory Accounting Practices, Statutory Net Income Amount | (22) | 42 | 15
RGA Atlantic [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,137 | 1,441 |
Statutory Accounting Practices, Statutory Net Income Amount | (226) | 175 | 243
RGA International Reinsurance Company dac [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,121 | 1,460 |
Statutory Accounting Practices, Statutory Net Income Amount | 43 | 52 | 37
RGA Americas [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 6,812 | 8,249 |
Statutory Accounting Practices, Statutory Net Income Amount | (241) | 879 | 1,049
Other Reinsurance Subsidiaries [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,015 | 1,298 |
Statutory Accounting Practices, Statutory Net Income Amount | (152) | 194 | 114
RGA Reinsurance Company Of Missouri |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 2,362 | 2,136 |
Statutory Accounting Practices, Statutory Net Income Amount | (13) | 4 | 75
RGA Worldwide Reinsurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 702 | 703 |
Statutory Accounting Practices, Statutory Net Income Amount | 10 | 104 | 106
RGA Global Reinsurance Company |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 565 | 495 |
Statutory Accounting Practices, Statutory Net Income Amount | $ 93 | $ 59 | $ 71

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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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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