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Segment Information - Additional Information (Detail) $ in Millions | 5 Months Ended | 12 Months Ended
--- | --- | ---
May 22, 2015 USD ($) | Dec. 31, 2017 Segment
Segment Reporting Information [Line Items] |  |
Number of reportable segments | Segment |  | 4
eLong, Inc |  |
Segment Reporting Information [Line Items] |  |
Stock-based compensation and intangible amortization | $ | $ 20 |

X
- Definition Sum of stock-based compensation and intangible amortization contained within standalone financial statements. + References No definition available. + Details
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Namespace Prefix: | expe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |