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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to Acquire Equity Method Investments |  | $ 18 | $ 157 | $ 3,219
Neumora Therapeutics, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 25.90% | 24.90% | 25.90% |
Payments to Acquire Equity Method Investments |  | $ 10 |  |
Neumora Therapeutics, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Aggregate Cost | $ 257 |  |  |
Payments to Acquire Equity Method Investments | 100 |  |  |
Noncash or Part Noncash Acquisition, Investments Acquired | $ 157 |  |  |
Equity Method Investments, Fair Value Disclosure |  | 335 | $ 220 |
Equity method investment, change in carrying value |  | $ 105 | $ (37) |

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