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Segment Reporting - Reconciliation of Segment Profits to Income before Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Profits	$ 4,090	$ 5,620	$ 15,766	$ 3,935
Interest income	127	73	269	295
Interest expense	(330)	(317)	(943)	(836)
Amortization			(1,720)	(1,582)
Depreciation			(1,582)	(1,326)
Research and development	(5,862)	(3,307)	(13,354)	(20,904)
Restructuring costs	(56)	(126)	(258)	(344)
Operating Segments
Segment Reporting Information [Line Items]
Profits	12,057	10,828	35,225	30,853
Operating Segments | Pharmaceutical segment
Segment Reporting Information [Line Items]
Profits	11,547	10,407	33,651	29,400
Operating Segments | Animal Health segment
Segment Reporting Information [Line Items]
Profits	510	421	1,574	1,453
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Profits	117	190	391	374
Interest income	127	73	269	295
Interest expense	(330)	(317)	(943)	(836)
Amortization	(633)	(562)	(1,720)	(1,582)
Depreciation	(467)	(401)	(1,368)	(1,175)
Research and development	(5,716)	(3,183)	(12,926)	(20,523)
Restructuring costs	(56)	(126)	(258)	(344)
Charge for Zetia antitrust litigation settlements	0	0	0	(573)
Other unallocated, net	$ (1,009)	$ (882)	$ (2,904)	$ (2,554)

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