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Fair value measurement (Details Textual) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 59,100	$ 35,000
Carrying value of debt	61,544	38,945
Teneobio Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum additional consideration due contingent on certain milestones	$ 1,600	1,600
BeiGene
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investments,Quoted Market Price		4,200
Carrying value of equity method investment		$ 2,200

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