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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments [Abstract] |  |  |  |
Sales | $ 69 | $ 116 | $ (313) | $ (85)
Credit losses | (23) | (12) | (103) | (143)
Valuation change of equity investments | 200 | 119 | 253 | 207
Valuation change and settlements of derivatives | 6 | 20 | (78) | (3)
Net gains (losses) on investments and derivatives | $ 252 | $ 243 | $ (241) | $ (24)

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