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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity securities	$ 3,470		$ 3,470		$ 4,514
Unrealized gains (losses) on equity securities	$ (50)	$ 3	$ 0	$ 0
Neumora Therapeutics, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	22.20%		22.20%		23.20%
Equity securities	$ 348		$ 348		$ 603
Unrealized gains (losses) on equity securities	$ (138)	$ 28	$ (255)	$ (19)
Neumora Therapeutics, Inc. | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage		5.00%		5.00%
Neumora Therapeutics, Inc. | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage		10.00%		10.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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