Segment Reporting - Equity Income from Affiliates and Depreciation Included in Segment Profits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Depreciation	$ 2,104	$ 1,828	$ 1,824
Operating Segments
Segment Reporting Information [Line Items]
Equity income from affiliates	144	111	39
Depreciation	261	203	182
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Equity income from affiliates	144	111	39
Depreciation	5	5	5
Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Equity income from affiliates	0	0	0
Depreciation	$ 256	$ 198	$ 177