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Investments, Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Investment Gains (Losses) [Abstract] |  |  |
Investment gains (losses) | [1] | $ 57 | $ (216)
Gross investment gains on available-for-sale securities |  | 58 | 29
Gross investment losses on available-for-sale securities |  | 20 | 104
Fixed Maturity Securities [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains (losses) |  | 38 | (75)
Equity Securities [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains (losses) |  | 2 | (133)
Derivative Instruments [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains (losses) |  | 17 | 5
Short Term Investments and Other [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains (losses) |  |  | (13)
Nonredeemable Preferred Stock [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Recognized gains (losses) on securities |  | $ 2 | $ (133)
[1] | Gross investment gains on available-for-sale securities were $58 and $29 for the three months ended March 31, 2021 and 2020. Gross investment losses on available-for-sale securities were $20 and $104 for the three months ended March 31, 2021 and 2020. During the three months ended March 31, 2021 and 2020, $2 of investment gains and $133 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of March 31, 2021 and 2020.

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