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Investments (Neumora Therapeutics, Inc.) (Details) - Neumora Therapeutics, Inc. - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Net Investment Income [Line Items] |  |  |  |
Ownership percentage | 25.90% | 24.90% | 24.90% | 25.90%
Equity Method Investment, Aggregate Cost | $ 257 |  |  |
Payments to Acquire Equity Method Investments | 100 | $ 10 |  |
Noncash or Part Noncash Acquisition, Investments Acquired | $ 157 |  |  |
Equity Method Investments, Fair Value Disclosure |  | 382 | $ 382 | $ 220
Equity method investment, change in carrying value |  | $ 240 | $ 152 |

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