Investments - BeiGene (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Net unrealized gains	$ 50	$ 5
Equity securities	3,985		$ 4,514
Other Noncurrent Assets
Debt Securities, Available-for-sale [Line Items]
Equity securities	536		494
Equity securities without readily determinable fair value	333		309
BeiGene
Debt Securities, Available-for-sale [Line Items]
Net unrealized gains	$ (454)	$ 1,900
BeiGene | Maximum
Debt Securities, Available-for-sale [Line Items]
Ownership percentage	5.00%	5.00%
BeiGene | Other Noncurrent Assets
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 3,000		$ 3,400