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Investments, Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Investment Gains (Losses) [Abstract] |  |  |
Investment gains | [1] | $ (216) | $ 31
Gross investment gains on available-for-sale securities |  | 29 | 36
Gross investment losses on available-for-sale securities |  | 104 | 42
Fixed Maturity Securities [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains |  | (75) | (6)
Equity Securities [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains |  | (133) | 42
Derivative Instruments [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains |  | 5 | (5)
Short-term Investments and Other [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Investment gains |  | (13) |
Nonredeemable Preferred Stock [Member] |  |  |
Investment Gains (Losses) [Abstract] |  |  |
Net recognized gains (losses) on securities |  | $ (133) | $ 42
[1] | Gross investment gains on available-for-sale securities were $29 and $36 for the three months ended March 31, 2020 and 2019. Gross investment losses on available-for-sale securities were $104 and $42 for the three months ended March 31, 2020 and 2019. During the three months ended March 31, 2020 and 2019, $133 of net investment losses and $42 of net investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of March 31, 2020 and 2019.

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