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Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Transaction Type (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
Investments [Abstract] |  |  |  |
Sales | $ 116 | $ (63) | $ (85) | $ (313)
Credit losses | (12) | (20) | (143) | (69)
Valuation change of equity investments | 119 | (34) | 207 | 187
Valuation change and settlements of derivatives | 20 | 31 | (3) | (28)
Net gains (losses) on investments and derivatives | $ 243 | $ (86) | $ (24) | $ (223)

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