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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |
Equity securities | $ 4,188 | $ 4,514 |
Unrealized gain (loss) on equity method investment | $ (21) | $ 98 | $ (165)
Neumora Therapeutics, Inc. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 21.90% | 23.20% |
Equity securities | $ 375 | $ 603 |
Unrealized gain (loss) on equity method investment | $ (228) | $ 238 | $ 105
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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