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Segment Information - Revenue by Business Model and Service Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenue	$ 3,929	$ 3,619	$ 9,952	$ 9,049
Lodging
Segment Reporting Information [Line Items]
Revenue	3,233	2,881	7,960	6,891
Air
Segment Reporting Information [Line Items]
Revenue	100	100	324	269
Advertising and media
Segment Reporting Information [Line Items]
Revenue	240	222	616	601
Other
Segment Reporting Information [Line Items]
Revenue	356	416	1,052	1,288
Merchant | Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	2,739	2,427	6,833	6,037
Agency | Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	918	935	2,408	2,309
Advertising, media and other | Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	$ 272	$ 257	$ 711	$ 703

X

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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