Goodwill and Other Intangible Assets (Narrative) (Details)		6 Months Ended	12 Months Ended
		Jun. 30, 2018	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2018	Apr. 01, 2018 USD ($)	Jun. 30, 2017 USD ($)
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, net			$ 13,039,000,000	$ 14,432,600,000
Fair value loss (gain)	[1]		(35,300,000)	(59,300,000)
Business Combination, Contingent Consideration, Liability			355,300,000	453,700,000	$ 564,600,000
In-process research and development			625,600,000	813,200,000
Goodwill, Impaired, Accumulated Impairment Loss			$ 385,000,000	385,000,000	385,000,000
Goodwill, Impaired, Change in Estimate, Period			5 years
Fair Value Inputs, Long-term Revenue Growth Rate, Terminal Year		2.00%
In-process research and development
Intangible Assets Excluding Goodwill [Line Items]
IPR&D intangible asset impairment charges			$ 117,700,000	74,600,000	49,900,000
Product rights and licenses
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, net			12,994,700,000	14,389,200,000
Impairment of products rights and licenses intangible assets			106,300,000	6,200,000	18,400,000
North America Generics [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss							$ 2,890,000,000
North America Specialty [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss							660,000,000
Europe Segment
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss			0	0	0		4,970,000,000
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount							$ 800,000,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount							6.00%
Rest of World Segment
Intangible Assets Excluding Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss			$ 0	$ 0	$ 0		$ 1,800,000,000
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			0.095	0.084	0.085
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			0.130	0.105	0.119
Measurement Input, Discount Rate [Member] | Goodwill [Member]
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values			0.090
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			$ 0.100
Measurement Input, Long-term Revenue Growth Rate [Member]
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values						0.04
Measurement Input, Estimated Tax Rate [Member]
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values			0.24
Measurement Input, EBITDA Multiple [Member] | Minimum
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values		9.0
Measurement Input, EBITDA Multiple [Member] | Maximum
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values		10.5
Measurement Input, Control Premium [Member]
Intangible Assets Excluding Goodwill [Line Items]
Rate used to discount net cash inflows to present values		0.15
Increased Discount Rate [Domain] | Measurement Input, Discount Rate [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill Impairment Test, Measurement Input, Increase		0.015
Reduction in Terminal Value Growth Rate [Domain] | Measurement Input, Long-term Revenue Growth Rate [Member]
Intangible Assets Excluding Goodwill [Line Items]
Goodwill Impairment Test, Measurement Input, Reduction		0.02
Respiratory delivery platform [Member]
Intangible Assets Excluding Goodwill [Line Items]
Fair value loss (gain)			$ 44,000,000	$ 93,500,000
Business Combination, Contingent Consideration, Liability			$ 336,500,000
In-process research and development								$ 347,200,000

[1] Included in litigation settlements and other contingencies, net in the Consolidated Statements of Operations.