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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effect of Fourth Quarter Events [Line Items]
Royalty payments									$ 536	$ 956	$ 814
Cost Of Goods Sold [Member]
Effect of Fourth Quarter Events [Line Items]
Royalty payments	$ 33	$ 28	$ 44	$ 37	$ 69	$ 53	$ 51	$ 37
Selling and Marketing Expenses [Member]
Effect of Fourth Quarter Events [Line Items]
Royalty payments	$ 33	$ 28	$ 44	$ 37	$ 69	$ 53	$ 51	$ 37

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

+ 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 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

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