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Investments, Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | $ 501 | $ 559 | $ 1,705 | $ 1,405
Investment expenses |  | (18) | (19) | (56) | (58)
Net investment income |  | 483 | 540 | 1,649 | 1,347
Net investment income recognized due to change in fair value on securities |  | (55) | 11 | (9) | 13
Fixed Maturity Securities [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | 425 | 432 | 1,278 | 1,300
Limited Partnership Investments [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | 89 | 71 | 285 | 26
Short Term Investments [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | 1 | 2 | 1 | 11
Equity Securities [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  |  |  | 53 | 24
Investment income |  | 4 | 18 |  |
Income (Loss) from Trading Portfolio [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income | [1] | (30) | 22 | 46 |
Other [Member] |  |  |  |  |
Net Investment Income [Abstract] |  |  |  |  |
Investment income |  | $ 12 | $ 14 | $ 42 | $ 44
[1] | Net investment income recognized due to the change in fair value on securities still held as of September 30, 2021 and 2020 was $(55) and $11 for the three months ended September 30, 2021 and 2020 and $(9) and $13 for the nine months ended September 30, 2021 and 2020.

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