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Third-Party Arrangements - Amount Due (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]    
Due from Merck in Accounts receivable $ 1,547 $ 1,744
Due to Merck in Accounts payable 955 1,314
Related Party    
Related Party Transaction [Line Items]    
Due from Merck in Accounts receivable 176 583
Due to Merck in Accounts payable $ 428 $ 619