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Investments - BeiGene (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 02, 2020
Net Investment Income [Line Items]
Payments to Acquire Equity Method Investments	$ 18	$ 157	$ 3,219
Company's share of profits (losses) of related party	$ (891)	$ (33)	(65)
BeiGene
Net Investment Income [Line Items]
Ownership percentage	18.20%	18.40%		20.50%
BeiGene
Net Investment Income [Line Items]
Equity Method Investment, Aggregate Cost				$ 2,800
Equity Method Investment, Quoted Market Value	$ 4,200	$ 5,100		2,600
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity				$ 2,400
Payments to Acquire Equity Method Investments		50	569
Equity Method Investment, Change In Carrying Value, Other	11	265	34
Company's share of profits (losses) of related party	(394)	(265)	(229)
Equity Method Investment, Amortization of Difference Between Carrying Amount and Underlying Equity	190	172	$ 109
Approximate carrying value of the company's equity method investment	$ 2,200	$ 2,800
BeiGene | Minimum
Net Investment Income [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years
BeiGene | Maximum
Net Investment Income [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years

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