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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 6,172,840 |
Entity Listing, Par Value Per Share |  |  | $ 0.01 |
Shares Issued, Price Per Share | $ 81.00 |  | $ 81.00 |
Document Period End Date |  |  | Sep. 30, 2020 |
Treasury Stock, Value, Acquired, Cost Method | $ 0 | $ 30 | $ 162 | $ 98
Stock Repurchase Program, Authorized Amount | $ 400 |  | 400 |
Proceeds from Issuance of Common Stock |  |  | $ 481 | $ 0
Underwriter Option Additional Shares |  |  | 925,926 |
RGA Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 1,074,413 | 546,614
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 153 | $ 80

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition The Company entered into an Underwriting Agreement which allows the Underwriters an option to purchase from the Company, within 30 days dated June 2, 2020, an additional number of shares of common stock at the offering price of $81.00 per share. + References No definition available. + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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