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Goodwill and Acquired Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Detail) - Intellectual property/developed technology - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Acquired Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 35 | $ 43
Accumulated Amortization and Currency Translation Adjustments | $ (20) | $ (20)
Maximum |  |
Acquired Finite-Lived Intangible Assets |  |
Amortization Life (in Years) | 7 years |
Minimum |  |
Acquired Finite-Lived Intangible Assets |  |
Amortization Life (in Years) | 1 year |

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- 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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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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