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Acquisitions and Other Investments - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) Business | Dec. 31, 2018 USD ($) Business | Dec. 31, 2017 Business
Acquisitions And Other Investments [Line Items] |  |  |  |  |
Cash consideration paid, net of cash acquired | $ 110 |  | $ 24 |  |
Cost method investments | $ 2 |  |  |  |
Series of Individually Immaterial Business Acquisition |  |  |  |  |
Acquisitions And Other Investments [Line Items] |  |  |  |  |
Number of business acquired | Business | 3 |  | 1 |  | 0
Acquisition-related costs expensed as incurred | $ 2 |  |  |  |
Total acquisition purchase price | 110 |  |  |  |
Cash consideration paid, net of cash acquired | 108 |  | $ 23 |  |
Cash acquired from acquisition | 2 |  |  |  |
Purchase price consideration | $ 110 | [1] | $ 23 | [2] |
SinglePlatform |  |  |  |  |
Acquisitions And Other Investments [Line Items] |  |  |  |  |
Percentage of ownership interests acquired | 100.00% |  |  |  |
Date of acquisition | Dec. 31, 2019 |  |  |  |
BookaTable |  |  |  |  |
Acquisitions And Other Investments [Line Items] |  |  |  |  |
Percentage of ownership interests acquired | 100.00% |  |  |  |
Date of acquisition | Dec. 31, 2019 |  |  |  |
Restorando |  |  |  |  |
Acquisitions And Other Investments [Line Items] |  |  |  |  |
Percentage of ownership interests acquired | 100.00% |  |  |  |
Date of acquisition | Feb. 28, 2019 |  |  |  |
[1] | Subject to adjustment based on (i) final working capital adjustment calculations; and (ii) indemnification obligations for general representations and warranties of certain acquired company stockholders.
[2] | Subject to adjustment based on indemnification obligations for general representations and warranties of certain acquired company stockholders.

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- Definition Date when the business acquisition agreement was executed, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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