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Fair Value Hierarchy - Investments, Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net realized gains/(losses) | $ 2 | $ (18) | $ 32 | $ (8)
Investments |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net realized gains/(losses) | 95 | 83 | 246 | 296
Net unrealized gains/(losses) | 88 | 189 | 357 | (20)
Investments | Operating income (loss) |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net realized gains/(losses) | 104 | 175 | 376 | (1)
Investments | Interest income |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net realized gains/(losses) | 79 | 97 | 227 | 277
Investments | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net realized gains/(losses) | $ 183 | $ 272 | $ 603 | $ (276)

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