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Equity (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2021 |
Treasury Stock, Value, Acquired, Cost Method | $ 1 | $ 6 | $ 2 | $ 162
Stock Repurchase Program, Authorized Amount | $ 400 |  | 400 |
Proceeds from issuance of common stock, net |  | $ 481 | $ 0 | $ 481
RGA Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 1,074,413 |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 153 |

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