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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue Recognition [Line Items]
Royalty income	$ 31	$ 27	$ 82	$ 239
United States [Member]
Revenue Recognition [Line Items]
Percentage sales reserves and allowances to U.S. customers			84.00%
Minimum [Member]
Revenue Recognition [Line Items]
Credit terms to customers			30 days
Maximum [Member]
Revenue Recognition [Line Items]
Credit terms to customers			90 days

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- Definition

Credit terms to customers.

+ References

No definition available.

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- Definition

Revenue Recognition [Line Items]

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- Definition

Sales reserves and allowances to customers percentage.

+ References

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- Definition

Ancillary revenue earned during the period from the consideration paid to the entity for the use of its rights and property by another party. Examples include licensing the use of copyrighted materials and leasing the extraction of natural resources.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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