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Acquisition, Collaborations and Other Arrangements - Collaborations and Other Arrangements (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Acquisition, Collaborations And Other Arrangements [Abstract]
Initial consideration transferred	$ 333
Up-front collaboration expenses	$ 160

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- Definition

Acquisition, Collaborations And Other Arrangements [Abstract]

+ References

No definition available.

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- Definition

Revenue Collaboration Agreement, Initial Consideration Transferred

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No definition available.

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- Definition

Amount of other research and development expense.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

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