Goodwill and Intangible Assets, Net - Summary of Changes in Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Beginning balance		$ 756	$ 758
Acquisitions	[1]	85	11
Other adjustments	[2]	(1)	(13)
Ending balance		840	756
Hotel Segment
Goodwill [Line Items]
Beginning balance		451	451
Allocation to new segments	[3]	(451)
Ending balance			451
Non-Hotel Segment
Goodwill [Line Items]
Beginning balance		305	307
Allocation to new segments	[3]	(305)
Acquisitions	[1]		11
Other adjustments	[2]		(13)
Ending balance			$ 305
Hotels, Media & Platform
Goodwill [Line Items]
Allocation to new segments	[3]	405
Ending balance		405
Experiences & Dining Segment
Goodwill [Line Items]
Allocation to new segments	[3]	250
Acquisitions	[1]	85
Other adjustments	[2]	(2)
Ending balance		333
Other Segments
Goodwill [Line Items]
Allocation to new segments	[3],[4]	101
Other adjustments	[2],[4]	1
Ending balance	[4]	$ 102

[1] The additions to goodwill relate to our business acquisitions. Refer to “Note 3: Acquisitions and Other Investments,” for further information.

[2]   (2) Primarily related to impact of changes in foreign currency exchange rates to goodwill.

[3]   (3) Refer to “Note 1: Organization and Business Description” for information on our reporting segment changes in the first quarter of 2019.

[4]   (4) Other consists of the combination of our Rentals, Flights/Cruises/Car, SmarterTravel, and Tripadvisor China business units and does not constitute a reportable segment.