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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Profits	$ 5,620	$ 3,583	$ 3,935	$ 12,931
Interest income	73	40	295	62
Interest expense	(317)	(244)	(836)	(727)
Amortization			(1,582)	(1,623)
Depreciation			(1,326)	(1,394)
Research and development	(3,307)	(4,399)	(20,904)	(9,773)
Restructuring costs	(126)	(94)	(344)	(288)
Operating Segments
Segment Reporting Information [Line Items]
Profits	10,828	10,105	30,853	29,935
Operating Segments | Pharmaceutical segment
Segment Reporting Information [Line Items]
Profits	10,407	9,590	29,400	28,263
Operating Segments | Animal Health segment
Segment Reporting Information [Line Items]
Profits	421	515	1,453	1,672
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Profits	190	377	374	831
Segment Reconciling Items
Segment Reporting Information [Line Items]
Interest income	73	40	295	62
Interest expense	(317)	(244)	(836)	(727)
Amortization	(562)	(460)	(1,582)	(1,623)
Depreciation	(401)	(448)	(1,175)	(1,257)
Research and development	(3,183)	(4,277)	(20,523)	(9,374)
Restructuring costs	(126)	(94)	(344)	(288)
Charge for Zetia antitrust litigation settlements	0	0	(573)	0
Other unallocated, net	$ (882)	$ (1,416)	$ (2,554)	$ (4,628)

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