Acquisitions, Divestitures, Equity-Method Investments, Licensing Arrangements and Collaborative Arrangements - Divestitures (Details) € in Millions				1 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Nov. 16, 2020 USD ($)	Nov. 13, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 EUR (€)	May 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from issuances of long-term debt					$ 0	$ 997,000,000	$ 5,222,000,000
Reduction in retained earnings	$ (103,394,000,000)				(125,656,000,000)	(103,394,000,000)
Line of Credit [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line of credit facility, maximum borrowing capacity					321,000,000
Line of Credit [Member] | Commercial Paper [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line of credit facility, maximum borrowing capacity				$ 4,000,000,000
Senior Notes [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, face amount									$ 4,000,000,000	$ 1,250,000,000
Unsecured Debt [Member] | Senior Notes Due 2021 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repurchased debt				$ 1,150,000,000
Stated interest rate				1.95%				1.95%
Unsecured Debt [Member] | Senior Notes Due 2023 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repurchased debt				$ 342,000,000
Stated interest rate				5.80%				5.80%
Discontinued Operations, Disposed of by Sale [Member] | Meridian [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received for disposition	51,000,000					51,000,000
Loss on sale of discontinued operations––net of tax	$ 167,000,000
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Upjohn Inc [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reduction in retained earnings		$ 1,600,000,000
Cash divested		412,000,000
Net increase to accumulated other comprehensive loss		423,000,000
Derecognition of net gains on foreign currency translation adjustment		397,000,000
Derecognition of prior service credits associated with benefit plans		$ 26,000,000
Separation-related costs							$ 434,000,000
Purchaser of Meridian [Member] | Manufacturing and Supply Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal	3 years
Period of continuing involvement after disposal, extension period	2 years
Purchaser of Meridian [Member] | Minimum [Member] | Transition Service Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal	12 months
Purchaser of Meridian [Member] | Maximum [Member] | Transition Service Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal	18 months
Viatris [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Nontrade receivables	$ 53,000,000					53,000,000
Nontrade payables					$ 94,000,000
Payment pursuant to terms of the separation agreement						$ 277,000,000
Viatris [Member] | Minimum [Member] | Manufacturing and Supply Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal							4 years
Viatris [Member] | Maximum [Member] | Transition Service Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal							3 years
Viatris [Member] | Maximum [Member] | Manufacturing and Supply Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal							7 years
Viatris [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Upjohn Inc [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received for disposition			$ 12,000,000,000
Upjohn Inc and Upjohn Finance B.V. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from issuances of long-term debt				$ 11,400,000,000
Upjohn Inc and Upjohn Finance B.V. [Member] | Senior Notes [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, face amount				600,000,000
Upjohn Inc [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal amount				$ 7,450,000,000
Upjohn Finance B.V. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal amount | €								€ 3,600
Viatris [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ratio, shares received for each share held			0.124079
Noncontrolling interest, ownership percentage by parent		57.00%
Viatris [Member] | Mylan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ratio, shares received for each share held			1
Noncontrolling interest, ownership percentage by noncontrolling owners		43.00%