Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
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_DividendsPayableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfOrdinaryDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=expe_DeclarationDateTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=expe_DeclarationDateThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=expe_DeclarationDateSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=expe_DeclarationDateFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=expe_DeclarationDateFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=expe_DeclarationDateSevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity - Summary of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Nov. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Dividends Payable [Line Items]
Dividends declared per common share (in dollars per share)		$ 0.34	$ 0.32	$ 0.98	$ 0.92
Payment of dividends to stockholders				$ 145	$ 138
Subsequent Event
Dividends Payable [Line Items]
Dividends declared per common share (in dollars per share)	$ 0.34
Record Date	Nov. 19, 2019
Payment Date	Dec. 12, 2019
February 6, 2019
Dividends Payable [Line Items]
Declaration Date				Feb. 06, 2019
Dividends declared per common share (in dollars per share)				$ 0.32
Record Date				Mar. 07, 2019
Payment of dividends to stockholders				$ 47
Payment Date				Mar. 27, 2019
May 1, 2019
Dividends Payable [Line Items]
Declaration Date				May 01, 2019
Dividends declared per common share (in dollars per share)				$ 0.32
Record Date				May 23, 2019
Payment of dividends to stockholders				$ 48
Payment Date				Jun. 13, 2019
July 24, 2019
Dividends Payable [Line Items]
Declaration Date				Jul. 24, 2019
Dividends declared per common share (in dollars per share)				$ 0.34
Record Date				Aug. 22, 2019
Payment of dividends to stockholders				$ 50
Payment Date				Sep. 12, 2019
February 7, 2018
Dividends Payable [Line Items]
Declaration Date					Feb. 07, 2018
Dividends declared per common share (in dollars per share)					$ 0.30
Record Date					Mar. 08, 2018
Payment of dividends to stockholders					$ 46
Payment Date					Mar. 28, 2018
April 24, 2018
Dividends Payable [Line Items]
Declaration Date					Apr. 24, 2018
Dividends declared per common share (in dollars per share)					$ 0.30
Record Date					May 24, 2018
Payment of dividends to stockholders					$ 45
Payment Date					Jun. 14, 2018
July 23, 2018
Dividends Payable [Line Items]
Declaration Date					Jul. 23, 2018
Dividends declared per common share (in dollars per share)					$ 0.32
Record Date					Aug. 23, 2018
Payment of dividends to stockholders					$ 47
Payment Date					Sep. 13, 2018