Debt Instrument Maturity Year

No definition available.

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- Definition

Maximum amount of reimbursement obligations by the related party.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of board members to be elected by separate class vote.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Related Party Transaction, Proceeds From Reimbursement of Expenses Incurred

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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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Period Type:	duration

- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=expe_FivePointNineFivePercentSeniorNotesDueOnTwoZeroTwoZeroMember
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- Details

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- Details

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- Details

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- Details

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- Details

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Related Party Transactions - Additional Information (Detail) - USD ($)			9 Months Ended
	Sep. 30, 2016	Mar. 24, 2016	Sep. 30, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Percentage of board members to be elected by separate class votes			25.00%
7.456% Senior Notes Due 2018
Related Party Transaction [Line Items]
Debt, interest rate (percentage)	7.456%		7.456%	7.456%
5.95% Senior Notes Due 2020
Related Party Transaction [Line Items]
Debt, interest rate (percentage)	5.95%		5.95%	5.95%
2.5% Senior Notes Due 2022
Related Party Transaction [Line Items]
Debt, interest rate (percentage)	2.50%		2.50%	2.50%
4.5% Senior Notes Due 2024
Related Party Transaction [Line Items]
Debt, interest rate (percentage)	4.50%		4.50%	4.50%
5.0% Senior Notes Due 2026
Related Party Transaction [Line Items]
Debt, interest rate (percentage)	5.00%		5.00%	5.00%
Credit Facility
Related Party Transaction [Line Items]
Unsecured revolving credit facility	$ 1,500,000,000		$ 1,500,000,000	$ 1,000,000,000
Reimbursement Agreement \| Liberty Interactive and Liberty Expedia Holdings
Related Party Transaction [Line Items]
Reimbursement obligations		$ 45,000,000
Reimbursement received	$ 4,000,000
Reimbursement Agreement \| Liberty Interactive and Liberty Expedia Holdings \| 7.456% Senior Notes Due 2018
Related Party Transaction [Line Items]
Senior notes, maturity year		2018
Reimbursement Agreement \| Liberty Interactive and Liberty Expedia Holdings \| 5.95% Senior Notes Due 2020
Related Party Transaction [Line Items]
Senior notes, maturity year		2020
Reimbursement Agreement \| Liberty Interactive and Liberty Expedia Holdings \| Credit Facility
Related Party Transaction [Line Items]
Unsecured revolving credit facility		$ 1,500,000,000