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Investments - BeiGene, Ltd. (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
Debt Securities, Available-for-sale [Line Items]
Net unrealized gains (losses)	$ (50)	$ 3	$ 0	$ 0
BeiGene
Debt Securities, Available-for-sale [Line Items]
Fair value of investments	2,700		2,700		$ 3,400
Net unrealized gains (losses)	$ (260)	$ (705)	$ (714)	$ 1,200
BeiGene
Debt Securities, Available-for-sale [Line Items]
Ownership percentage	18.00%		18.00%		18.00%
BeiGene | Maximum
Debt Securities, Available-for-sale [Line Items]
Ownership percentage	5.00%	5.00%	5.00%	5.00%

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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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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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