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Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fixed maturity securities: |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | $ (7) | $ (10) | $ (62) | $ (42)
Nonredeemable Preferred Stock |  |  |  |
Fixed maturity securities: |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | 4 | 13 | 8 | 24
Fixed maturity securities |  |  |  |
Fixed maturity securities: |  |  |  |
Gross gains | 15 | 11 | 33 | 38
Gross losses | (25) | (33) | (100) | (104)
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | (10) | (22) | (67) | (66)
Equity securities |  |  |  |
Fixed maturity securities: |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | 4 | 13 | 10 | 25
Short-term investments and other |  |  |  |
Fixed maturity securities: |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held | $ (1) | $ (1) | $ (5) | $ (1)

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