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Segment Reporting - Equity Income from Affiliates and Depreciation Included in Segment Profits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Depreciation $ 1,828 $ 1,824 $ 1,578
Operating Segments      
Segment Reporting Information [Line Items]      
Equity income from affiliates 111 39 11
Depreciation 203 182 164
Operating Segments | Pharmaceutical      
Segment Reporting Information [Line Items]      
Equity income from affiliates 111 39 11
Depreciation 5 5 6
Operating Segments | Animal Health      
Segment Reporting Information [Line Items]      
Equity income from affiliates 0 0 0
Depreciation $ 198 $ 177 $ 158