Acquisitions, Divestitures, Equity-Method Investments, Licensing Arrangements and Collaborative Arrangements - Summarized Financial Information of Discontinued Operations (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
		Dec. 31, 2021	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Costs and expenses:
Discontinued operations––net of tax				$ (434)	$ 2,529	$ 5,318
Certain legal matters, net	[1]			182	28	292
Discontinued Operations [Member]
Income Statement Disclosures
Revenues	[2]			277	7,572	10,845
Costs and expenses:
Cost of sales	[2]			204	2,106	2,173
Selling, informational and administrative expenses	[2]			26	1,682	1,624
Research and development expenses	[2]			9	224	265
Amortization of intangible assets	[2]			45	224	181
Restructuring charges and certain acquisition-related costs	[2]			2	29	146
Other (income)/deductions––net	[2]			365	428	401
Pre-tax income/(loss) from discontinued operations	[2]			(375)	2,879	6,056
Provision/(benefit) for taxes on income	[2]			(107)	349	738
Income/(loss) from discontinued operations––net of tax	[2]			(268)	2,529	5,318
Pre-tax loss on sale of discontinued operations	[2]			(211)	0	0
Benefit for taxes on income	[2]			(44)	0	0
Loss on sale of discontinued operations––net of tax	[2]			(167)	0	0
Discontinued operations––net of tax	[2]			(434)	2,529	$ 5,318
Assets
Current assets of discontinued operations and other assets held for sale––Other current assets	[3]	$ 25		25	215
Property, plant and equipment	[3]	0		0	155
Identifiable intangible assets	[3]	0		0	134
Other noncurrent assets	[3]	0		0	29
Noncurrent assets of discontinued operations––Other noncurrent assets	[3]	0		0	319
Liabilities
Current liabilities of discontinued operations––Other current liabilities	[3]	0		0	74
Noncurrent liabilities of discontinued operations––Other noncurrent liabilities	[3]	0		0	16
Discontinued Operations [Member] | Upjohn Inc and Upjohn Finance B.V. [Member]
Costs and expenses:
Interest expense					116
Discontinued Operations [Member] | Upjohn Finance B. V.
Costs and expenses:
Pre-tax charges related to remeasurement of Euro debt					$ 223
Discontinued Operations, Disposed of by Sale [Member] | Meridian [Member]
Costs and expenses:
Loss on sale of discontinued operations––net of tax		$ (167)
Discontinued Operations, Disposed of by Sale [Member] | Meridian [Member] | Epi Pen [Member]
Costs and expenses:
Certain legal matters, net			$ 345	$ 345

[1] Includes legal reserves for certain pending legal matters.

[2] In 2021, Discontinued operations—net of tax primarily includes (i) the operations of Meridian prior to its sale on December 31, 2021 recognized in Income/(loss) from discontinued operations—net of tax, which includes a pre-tax amount for a Multi-District Litigation relating to EpiPen against the Company in the U.S. District Court for the District of Kansas for $345 million; and (ii) the after tax loss of $167 million related to the sale of Meridian recognized in Loss on sale of discontinued operations––net of tax. To a much lesser extent, Discontinued operations—net of tax in 2021 also includes the operations of the Mylan-Japan collaboration prior to its termination on December 21, 2020 and post-closing adjustments directly related to our former Upjohn and Nutrition discontinued businesses, including adjustments for tax, benefits and legal-related matters recognized in Income/(loss) from discontinued operations—net of tax. In 2020 and 2019, Discontinued operations—net of tax relates to the operations of the Upjohn Business, Meridian and the Mylan-Japan collaboration and includes the change in accounting principle in the first quarter of 2021 to MTM Accounting. See Note 1C. In 2020, Discontinued operations—net of tax includes pre-tax interest expense of $116 million associated with the U.S. dollar and Euro denominated senior unsecured notes issued by Upjohn Inc. and Upjohn Finance B.V. in the second quarter of 2020 and pre-tax charges of $223 million related to the remeasurement of Euro debt issued by Upjohn Finance B.V. in the second quarter of 2020.

[3] Amounts as of December 31, 2021 represent property, plant and equipment held for sale. Amounts as of December 31, 2020 primarily relate to discontinued operations of our former Meridian subsidiary and the Mylan-Japan collaboration.