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Fair Value of Financial Instruments - Investments Held at Net Asset Value (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Fair value disclosure |  |  |
(Loss) gain on investments | $ (61) | $ 66 |
Net Asset Value | Fair Value |  |  |
Fair value disclosure |  |  |
Investment in limited partnership | $ 24 |  | $ 85

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