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Third-Party Arrangements - Schedule of Amount Due (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Related Party Transaction [Line Items]    
Due from Merck in Accounts receivable $ 1,457 $ 1,358
Due to Merck in Accounts payable 1,006 1,153
Related Party    
Related Party Transaction [Line Items]    
Due from Merck in Accounts receivable 114 148
Due to Merck in Accounts payable $ 380 $ 362