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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity securities | $ 6,819 |  | $ 6,819 |  | $ 4,188
Neumora Therapeutics, Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 21.80% |  | 21.80% |  | 21.90%
Equity securities | $ 64 |  | $ 64 |  | $ 375
Unrealized gains (losses) on equity securities | $ 38 | $ 119 | $ (311) | $ (136) |
Neumora Therapeutics, Inc. | Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 5.00% |  | 5.00% |  |
Neumora Therapeutics, Inc. | Minimum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 10.00% |  | 10.00% |  |

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