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Investments - Neumora Therapeutics, Inc. (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Equity securities	$ 6,819		$ 6,819		$ 4,188
Neumora Therapeutics, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	21.80%		21.80%		21.90%
Equity securities	$ 64		$ 64		$ 375
Unrealized gains (losses) on equity securities	$ 38	$ 119	$ (311)	$ (136)
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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