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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue Recognition [Line Items]
Royalty income	$ 21	$ 105
Percentage sales reserves and allowances to U.S. customers			86.00%
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]

+ References

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- Definition

Sales reserves and allowances to customers percentage.

+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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