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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Unrealized gain (loss) on equity method investment |  |  | $ 98 | $ (165) | $ 161
Neumora Therapeutics, Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 25.90% |  | 23.20% | 24.90% |
Payments to acquire equity method investments, cash |  | $ 30 |  |  |
Carrying and fair value of investment |  |  | $ 603 | $ 335 |
Unrealized gain (loss) on equity method investment |  |  | $ 238 | $ 105 | $ (37)
Neumora Therapeutics, Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, aggregate cost | $ 257 |  |  |  |
Payments to acquire equity method investments, cash | 100 |  |  |  |
Payments to acquire equity method investments, noncash | $ 157 |  |  |  |

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