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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Schedule of Equity Method Investments [Line Items] |  |  |
Equity securities | $ 5,482,000,000 |  | $ 4,188,000,000
Unrealized gains (losses) on equity securities | $ 0 | $ 0 |
Neumora Therapeutics, Inc. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 21.80% |  | 21.90%
Equity securities | $ 35,000,000 |  | $ 375,000,000
Unrealized gains (losses) on equity securities | $ (340,000,000) | $ (117,000,000) |
Neumora Therapeutics, Inc. | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 5.00% |  |
Neumora Therapeutics, Inc. | Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 10.00% |  |

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