ACQUISITIONS (Details) $ in Millions, € in Billions		1 Months Ended
		Dec. 31, 2021 USD ($)	Nov. 30, 2021 USD ($)	Nov. 30, 2021 EUR (€)	Jun. 30, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 2,887			$ 2,842
Etraveli Group
Business Acquisition [Line Items]
Business combination, pending acquisition not yet completed, acquisition price			$ 1,700	€ 1.6
Getaroom
Business Acquisition [Line Items]
Business combination, consideration transferred		1,300
Payments to acquire businesses, net of cash acquired		1,200
Current assets	[1]	174
Identifiable intangible assets	[2]	423
Goodwill	[3]	1,020
Other noncurrent assets		10
Current liabilities		(198)
Deferred income taxes		(92)
Other noncurrent liabilities	[4]	(41)
Total consideration		1,296
Cash acquired from acquisition		116
Getaroom | Travel Transaction Related Taxes
Business Acquisition [Line Items]
Other noncurrent liabilities		(38)
Getaroom | Distribution Agreement
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		$ 299
Acquired finite-lived intangible assets, weighted average useful life		10 years
Getaroom | Technology
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		$ 124
Acquired finite-lived intangible assets, weighted average useful life		4 years

[1] Includes cash and restricted cash acquired of $116 million.

[2] Acquired definite-lived intangible assets consist of supply and distribution agreements with an estimated value of $299 million and weighted-average useful life of 10 years and technology assets with an estimated value of $124 million and weighted-average useful life of 4 years.

[3] Goodwill, which is not tax deductible, reflects the synergies expected from combining the technology and expertise of Getaroom and Priceline.

[4] Includes liabilities of $38 million principally related to travel transaction taxes.