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Investments, Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Net Investment Income [Abstract] |  |  |
Investment income |  | $ 184 | $ 676
Investment expenses |  | (21) | (19)
Net investment income |  | 163 | 657
Net unrealized gains (losses) on securities |  | (117) | 44
Fixed Maturity Securities [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Investment income |  | 438 | 455
Limited Partnership Investments [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Investment income |  | (102) | 81
Short Term Investments [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Investment income |  | 7 | 15
Equity Securities [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Investment income |  | (44) | 30
Income (Loss) from Trading Portfolio [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Investment income | [1] | (129) | 81
Other [Member] |  |  |
Net Investment Income [Abstract] |  |  |
Investment income |  | $ 14 | $ 14
[1] | Net unrealized gains (losses) related to changes in fair value on securities still held were $(117) and $44 for the three months ended March 31, 2020 and 2019.

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