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Goodwill and Other Intangibles - Goodwill Activity by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 18,882	$ 18,069
Acquisitions	2,436	847
Divestitures		(54)
Other	(54)	20
Goodwill, ending balance	21,264	18,882
Accumulated goodwill impairment losses	531	531
Pharmaceutical
Goodwill [Roll Forward]
Goodwill, beginning balance	15,614	14,825
Acquisitions	2,431	742
Divestitures		0
Other	(48)	47
Goodwill, ending balance	17,997	15,614
Animal Health
Goodwill [Roll Forward]
Goodwill, beginning balance	3,268	3,192
Acquisitions	5	105
Divestitures		0
Other	(6)	(29)
Goodwill, ending balance	3,267	3,268
All Other
Goodwill [Roll Forward]
Goodwill, beginning balance	0	52
Acquisitions	0	0
Divestitures		(54)
Other	0	2
Goodwill, ending balance	$ 0	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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