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Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | $ (10) | $ (38) | $ (42) | $ (59)
Nonredeemable Preferred Stock |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | 13 | 2 | 24 | 2
Fixed maturity securities |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Gross gains | 11 | 12 | 38 | 55
Gross losses | (33) | (49) | (104) | (141)
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | (22) | (37) | (66) | (86)
Equity securities |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | 13 | 2 | 25 | (9)
Short-term investments and other |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | $ (1) | $ (3) | $ (1) | (10)
Gain on acquisition of a joint venture |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held |  |  |  | $ 46

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