Debt Instrument, Covenant, Leverage Ratio, Maximum

No definition available.

Name:	expe_DebtInstrumentCovenantLeverageRatioMaximum
Namespace Prefix:	expe_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Interest Rate, Additional Interest If Certain Obligations Are Not Satisfied

+ References

No definition available.

+ Details

Name:	expe_DebtInstrumentInterestRateAdditionalInterestIfCertainObligationsAreNotSatisfied
Namespace Prefix:	expe_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Additional Borrowing Capacity

+ References

No definition available.

+ Details

Name:	expe_LineofCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	expe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The senior notes were issued at a percentage of par (less than 100% of par results in a discount).

+ References

No definition available.

+ Details

Name:	expe_SeniorNotesIssuedPricePercentage
Namespace Prefix:	expe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

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

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=expe_UncommittedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=expe_ForeignSubsidiaryOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_FivePointNineFivePercentSeniorNotesDueOnTwoZeroTwoZeroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_TwoPointFivePercentSeniorNotesDueOnTwoZeroTwoTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_ThreePointSixPercentSeniorNotesDueTwoThousandTwentyThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=expe_UnsecuredSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_FourPointFivePercentSeniorNotesDueOnTwoZeroTwoFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_SixPointTwentyFivePercentUnsecuredSeniorNotesDueMayTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_SevenPercentUnsecuredSeniorNotesDueMayTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_FivePointZeroPercentSeniorNotesDueOnTwoZeroTwoSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_FourPointSixTwoFivePercentSeniorNotesDueTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_ThreePointEightPercentSeniorNotesDueOnTwoZeroTwoEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_ThreePointTwentyFivePercentSeniorNotesDueTwoThousandThirtyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_ForeignCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=expe_AmendedCreditFacilityMaturingonMay312023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Detail)				9 Months Ended
Debt - Additional Information (Detail)	Aug. 05, 2020	May 05, 2020 USD ($)	May 04, 2020	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2020 USD ($)	Aug. 14, 2020 USD ($)	Jul. 14, 2020 USD ($)	Mar. 18, 2020 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Revolving credit facility repayments				$ 2,022,000,000	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility							$ 2,000,000,000			$ 1,900,000,000
Credit facility borrowings outstanding												$ 0
Letters of credit issued under the credit facility							17,000,000					16,000,000
Uncommitted Credit Facility \| International Subsidiary One
Debt Instrument [Line Items]
Credit facility \| €						€ 50,000,000
Credit facility borrowings outstanding \| €						€ 0					€ 0
Senior Notes
Debt Instrument [Line Items]
Accrued interest related to senior notes							107,000,000					76,000,000
Fair value of senior notes							$ 8,600,000,000					$ 5,100,000,000
Upon the occurrence of certain change of control triggering events \| Senior Notes
Debt Instrument [Line Items]
Debt instrument redemption price percentage				101.00%
5.95% senior notes due 2020
Debt Instrument [Line Items]
Senior unsecured notes principal amount								$ 750,000,000
Debt, interest rate (percentage)						5.95%	5.95%	5.95%			5.95%	5.95%
2.5% (€650 million) senior notes due 2022
Debt Instrument [Line Items]
Senior unsecured notes principal amount \| €						€ 650,000,000					€ 650,000,000
Debt, interest rate (percentage)						2.50%	2.50%				2.50%	2.50%
3.6% senior notes due 2023
Debt Instrument [Line Items]
Debt, interest rate (percentage)						3.60%	3.60%
3.6% senior notes due 2023 \| Unsecured Senior Notes
Debt Instrument [Line Items]
Senior unsecured notes principal amount									$ 500,000,000
Debt, interest rate (percentage)									3.60%
Senior notes issued price percentage									99.922%
Additional interest if certain obligations are not satisfied						0.0025	0.0025
4.5% senior notes due 2024
Debt Instrument [Line Items]
Debt, interest rate (percentage)						4.50%	4.50%				4.50%	4.50%
6.25% senior notes due 2025
Debt Instrument [Line Items]
Debt, interest rate (percentage)						6.25%	6.25%
6.25% senior notes due 2025 \| Unsecured Senior Notes
Debt Instrument [Line Items]
Senior unsecured notes principal amount		$ 2,000,000,000
Debt, interest rate (percentage)		6.25%
Debt instrument redemption price percentage		100.00%
7.0% senior notes due 2025
Debt Instrument [Line Items]
Debt, interest rate (percentage)						7.00%	7.00%
7.0% senior notes due 2025 \| Unsecured Senior Notes
Debt Instrument [Line Items]
Senior unsecured notes principal amount		$ 750,000,000
Debt, interest rate (percentage)		7.00%
Debt instrument redemption price percentage		100.00%
7.0% senior notes due 2025 \| Unsecured Senior Notes \| Maximum
Debt Instrument [Line Items]
Percentage of principal amount redeemed		40.00%
5.0% senior notes due 2026
Debt Instrument [Line Items]
Debt, interest rate (percentage)						5.00%	5.00%				5.00%	5.00%
4.625% senior notes due 2027
Debt Instrument [Line Items]
Debt, interest rate (percentage)						4.625%	4.625%
4.625% senior notes due 2027 \| Unsecured Senior Notes
Debt Instrument [Line Items]
Senior unsecured notes principal amount									$ 750,000,000
Debt, interest rate (percentage)									4.625%
Senior notes issued price percentage									99.997%
Additional interest if certain obligations are not satisfied						0.0025	0.0025
3.8% senior notes due 2028
Debt Instrument [Line Items]
Debt, interest rate (percentage)						3.80%	3.80%				3.80%	3.80%
3.25% senior notes due 2030
Debt Instrument [Line Items]
Debt, interest rate (percentage)						3.25%	3.25%				3.25%	3.25%
Foreign Credit Facility
Debt Instrument [Line Items]
Credit facility borrowings outstanding							$ 0
Additional borrowing capacity							$ 855,000,000
Revolving credit facility repayments				$ 772,000,000
Foreign Credit Facility \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument, covenant, leverage ratio, maximum	5.00
Foreign Credit Facility \| Notes prior to November 15, 2029 \| Minimum
Debt Instrument [Line Items]
Debt, interest rate (percentage)	1.25%
Foreign Credit Facility \| Notes prior to November 15, 2029 \| Maximum
Debt Instrument [Line Items]
Debt, interest rate (percentage)	2.00%
Foreign Credit Facility \| Eurodollar
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Foreign Credit Facility \| Base Rate \| Notes prior to November 15, 2029
Debt Instrument [Line Items]
Commitment fee on undrawn amounts	1.50%
Foreign Credit Facility \| Base Rate \| Notes on or after November 15, 2029 \| Minimum
Debt Instrument [Line Items]
Debt, interest rate (percentage)	0.25%
Foreign Credit Facility \| Base Rate \| Notes on or after November 15, 2029 \| Maximum
Debt Instrument [Line Items]
Debt, interest rate (percentage)	1.00%
Amended Credit Facility Maturing on May 31, 2023
Debt Instrument [Line Items]
Debt, interest rate (percentage)						2.41%	2.41%
Credit facility							$ 2,000,000,000
Credit facility borrowings outstanding							$ 650,000,000
Commitment fee on undrawn amounts			2.25%
Revolving credit facility repayments				$ 478,000,000
Amended Credit Facility Maturing on May 31, 2023 \| Upon the occurrence of certain change of control triggering events
Debt Instrument [Line Items]
Debt instrument, covenant, leverage ratio, maximum			5.00
Amended Credit Facility Maturing on May 31, 2023 \| Notes prior to November 15, 2029 \| Minimum
Debt Instrument [Line Items]
Debt, interest rate (percentage)			1.00%
Amended Credit Facility Maturing on May 31, 2023 \| Notes prior to November 15, 2029 \| Maximum
Debt Instrument [Line Items]
Debt, interest rate (percentage)			1.75%
Amended Credit Facility Maturing on May 31, 2023 \| Base Rate \| Notes prior to November 15, 2029
Debt Instrument [Line Items]
Commitment fee on undrawn amounts			1.25%
Amended Credit Facility Maturing on May 31, 2023 \| Base Rate \| Notes on or after November 15, 2029 \| Minimum
Debt Instrument [Line Items]
Debt, interest rate (percentage)			0.00%
Amended Credit Facility Maturing on May 31, 2023 \| Base Rate \| Notes on or after November 15, 2029 \| Maximum
Debt Instrument [Line Items]
Debt, interest rate (percentage)			0.75%