ACQUISITIONS - Allocation (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021	[1]	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 2,807	[1]	$ 2,887		$ 1,895
Getaroom
Business Acquisition [Line Items]
Current assets	[2]	174
Identifiable intangible assets	[3]	437
Goodwill	[4]	982
Other non-current assets		11
Current liabilities		(199)
Deferred income taxes		(65)
Other non-current liabilities	[5]	(44)
Total consideration		1,296
Cash acquired		116
Getaroom | Travel Transaction Related Taxes
Business Acquisition [Line Items]
Other non-current liabilities		(39)
Getaroom | Supply and distribution agreements
Business Acquisition [Line Items]
Identifiable intangible assets		$ 311
Weighted average useful life		10 years
Getaroom | Technology
Business Acquisition [Line Items]
Identifiable intangible assets		$ 118
Weighted average useful life		4 years
Getaroom | Trade names
Business Acquisition [Line Items]
Identifiable intangible assets		$ 5
Weighted average useful life		3 years
Getaroom | Other intangible assets
Business Acquisition [Line Items]
Identifiable intangible assets		$ 3
Weighted average useful life		5 years

[1] The balance of goodwill as of December 31, 2022 and 2021 is stated net of cumulative impairment charges of $2.0 billion.

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

[3] Acquired definite-lived intangible assets consist of supply and distribution agreements with an estimated value of $311 million and weighted-average useful life of 10 years, technology assets with an estimated value of $118 million and weighted-average useful life of 4 years, trade names with an estimated value of $5 million and weighted-average useful life of 3 years and other intangible assets with an estimated value of $3 million and weighted-average useful life of 5 years.

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

[5] Includes liabilities of $39 million principally related to travel transaction taxes.