Goodwill and Other Intangible Assets (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 01, 2018 USD ($)
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, net	$ 29,602,500,000	$ 11,529,600,000
Contingent consideration liability	223,600,000	250,700,000	$ 355,300,000
Contingent consideration payments	(111,800,000)	(99,000,000.0)
In-process research and development	80,700,000	120,300,000
Goodwill, Impaired, Accumulated Impairment Loss	385,000,000.0	385,000,000.0	385,000,000.0
In-process research and development
Intangible Assets Excluding Goodwill [Line Items]
IPR&D intangible asset impairment charges	37,400,000	138,300,000	117,700,000
Product rights and licenses
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, net	29,598,700,000	11,518,100,000
Impairment of products rights and licenses intangible assets	$ 45,000,000.0	$ 42,300,000	$ 106,300,000
North America Generics [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss				$ 2,600,000,000
North America Specialty [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss				650,000,000
Europe Segment
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss				4,430,000,000
Rest of World Segment
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss				$ 1,650,000,000
Measurement Input, Discount Rate [Member] | In-process research and development | Minimum
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values	0.090	0.090	0.095
Measurement Input, Discount Rate [Member] | In-process research and development | Maximum
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values	0.110	0.110	0.130
Measurement Input, Discount Rate [Member] | Product rights and licenses | Minimum
Intangible Assets Excluding Goodwill [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 0.090
Measurement Input, Discount Rate [Member] | Product rights and licenses | Maximum
Intangible Assets Excluding Goodwill [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	0.110
Respiratory delivery platform [Member]
Intangible Assets Excluding Goodwill [Line Items]
Contingent consideration liability	204,900,000
Contingent consideration payments	111,800,000	$ 99,000,000.0
Other current liabilities
Intangible Assets Excluding Goodwill [Line Items]
Contingent consideration liability	100,500,000	120,400,000	$ 158,300,000
Contingent consideration payments	$ (111,800,000)	$ (99,000,000.0)