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Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
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 as of June 30, 2023 and 2022 | $ 14 | $ (59) | $ (21) | $ (70)
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 as of June 30, 2023 and 2022 | 46 |  | 46 |
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 as of June 30, 2023 and 2022 | 3 | (70) | 0 | (108)
Fixed maturity securities |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Gross gains | 8 | 45 | 43 | 71
Gross losses | (35) | (60) | (92) | (88)
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock included within equity securities held as of June 30, 2023 and 2022 | (27) | (15) | (49) | (17)
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 as of June 30, 2023 and 2022 | 3 | (71) | (11) | (109)
Derivative instruments |  |  |  |
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 as of June 30, 2023 and 2022 |  | 26 |  | 55
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 as of June 30, 2023 and 2022 | $ (8) | $ 1 | $ (7) | $ 1

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