Dismissal findings.

No definition available.

Name:	expe_DismissalBasedOnFindingNotSubjectToTax
Namespace Prefix:	expe_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the number of lawsuits in which the reporting entity was involved.

+ References

No definition available.

+ Details

Name:	expe_LossContingencyNumberOfLawsuits
Namespace Prefix:	expe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the number of lawsuits in which the reporting entity was involved and which are currently active.

+ References

No definition available.

+ Details

Name:	expe_LossContingencyNumberOfLawsuitsCurrentlyActive
Namespace Prefix:	expe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Monies paid in advance of litigation in occupancy and other tax proceedings.

+ References

No definition available.

+ Details

Name:	expe_OccupancyAndOtherTaxAssessmentPayments
Namespace Prefix:	expe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payments in advances of litigation in occupancy and other tax proceedings, paid to date.

+ References

No definition available.

+ Details

Name:	expe_PaymentsForOccupancyAndOtherTaxAssessmentPaidToDate
Namespace Prefix:	expe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Proceeds from pay-to-play refund.

+ References

No definition available.

+ Details

Name:	expe_ProceedsFromTaxRefund
Namespace Prefix:	expe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Taxes Paid, Net of Refunds

+ References

No definition available.

+ Details

Name:	expe_TaxesPaidNetOfRefunds
Namespace Prefix:	expe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

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

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of claims dismissed.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingencyClaimsDismissedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=expe_LitigationRelatingToOccupancyTaxMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_HI
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=expe_OrbitzWorldwideIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=expe_TravelCompaniesMember
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Commitments and Contingencies - Additional Information (Detail) $ in Millions			1 Months Ended	12 Months Ended
	May 15, 2017 USD ($)	May 26, 2014 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2017 USD ($) LegalMatter	Dec. 31, 2013 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2016 USD ($)
Litigation relating to occupancy tax
Loss Contingencies [Line Items]
Number of lawsuits filed by cities, counties and states involving hotel occupancy taxes \| LegalMatter				96
Number of lawsuits currently active \| LegalMatter				16
Number of lawsuits dismissed to date \| LegalMatter				42
Dismissal based in finding not subject to tax \| LegalMatter				28
Reserve for legal contingencies				$ 43.0			$ 71.0
Estimate of loss				56.0
Colorado \| Litigation Related to Other Taxes
Loss Contingencies [Line Items]
Estimate of loss				23.0
Hawaii \| Litigation Related to Other Taxes
Loss Contingencies [Line Items]
Pay-to-play occupancy and other tax payments	$ 16.7				$ 171.0
Tax refunds received			$ 132.0
Tax paid, net of refunds				44.0
Hawaii \| Litigation Related to Other Taxes \| Orbitz Worldwide, Inc.
Loss Contingencies [Line Items]
Tax refunds received			$ 22.0
City of San Francisco
Loss Contingencies [Line Items]
Pay-to-play occupancy and other tax payments		$ 25.5				$ 48.0
City of San Francisco \| Orbitz Worldwide, Inc.
Loss Contingencies [Line Items]
Payments for occupancy and other tax assessments				$ 4.6