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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 |  |  |

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- 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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