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Investments, Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Investment Gains (Losses) [Abstract] |  |  |  |  |
Investment gains (losses) | [1] | $ 22 | $ 46 | $ 657 | $ (1,312)
Fixed Maturity Securities [Member] |  |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |  |
Gross gains |  | 50 | 44 | 159 | 175
Gross losses |  | (28) | (18) | (68) | (207)
Investment gains (losses) |  | 22 | 26 | 91 | (32)
Equity Securities [Member] |  |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |  |
Investment gains (losses) |  | (2) | 25 | 17 | (45)
Derivative Instruments [Member] |  |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |  |
Investment gains (losses) |  | 2 | (2) | 7 | (7)
Short Term Investments and Other [Member] |  |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |  |
Investment gains (losses) |  |  | (3) | 2 | (17)
Altium Packaging [Member] | Sale of Interest [Member] |  |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |  |
Investment gains (losses) |  |  |  | 555 |
Diamond Offshore [Member] |  |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |  |
Investment gains (losses) |  |  |  | (15) | (1,211)
Nonredeemable Preferred Stock [Member] |  |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |  |
Recognized gains (losses) on securities |  | $ (2) | $ 25 | $ 15 | $ (44)
[1] | During the three and nine months ended September 30, 2021, $2 of investment losses and $15 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of September 30, 2021. During the three and nine months ended September 30, 2020, $25 of investment gains and $44 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of September 30, 2020.

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