Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income (loss)		$ (289,000,000)		$ 126,000,000	$ 113,000,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization		125,000,000		126,000,000	116,000,000
Stock-based compensation expense (Note 15)		109,000,000		124,000,000	118,000,000
Deferred income tax expense (benefit) (Note 12)		(1,000,000)		6,000,000	(6,000,000)
Provision for expected credit losses (Note 2)		17,000,000		11,000,000	11,000,000
Impairment of goodwill (Note 8)		3,000,000	[1]	0	0
Loss on sale/disposal of business (Note 18)	[2]	6,000,000
Other, net		11,000,000		(3,000,000)	7,000,000
Changes in operating assets and liabilities, net of effects from acquisitions and other investments:
Accounts receivable and contract assets, prepaid expenses and other assets		92,000,000		23,000,000	(8,000,000)
Accounts payable, accrued expenses and other liabilities		(28,000,000)		(1,000,000)	22,000,000
Deferred merchant payables		(124,000,000)		(3,000,000)	14,000,000
Income tax receivables/payables, net		(81,000,000)		17,000,000	13,000,000
Deferred revenue		(34,000,000)		(2,000,000)	5,000,000
Net cash provided by (used in) operating activities		(194,000,000)		424,000,000	405,000,000
Investing activities:
Capital expenditures, including internal-use software and website development		(55,000,000)		(83,000,000)	(61,000,000)
Acquisitions and other investments, net of cash acquired (Note 3)		(4,000,000)		(110,000,000)	(24,000,000)
Purchases of marketable securities				(133,000,000)	(16,000,000)
Sales of marketable securities				80,000,000	59,000,000
Maturities of marketable securities				70,000,000	5,000,000
Other investing activities, net		3,000,000			(12,000,000)
Net cash provided by (used in) investing activities		(56,000,000)		(176,000,000)	(49,000,000)
Financing activities:
Repurchase of common stock (Note 16)		(115,000,000)		(60,000,000)	(100,000,000)
Payment of common stock cash dividends to stockholders (Note 16)				(488,000,000)
Payments of financing costs for amendments to 2015 credit facility (Note 10)		(7,000,000)
Proceeds from issuance of Senior Notes (Note 10)		500,000,000
Payments of financing costs for the issuance of Senior Notes (Note 10)		(10,000,000)
Proceeds from exercise of stock options				2,000,000	6,000,000
Payment of withholding taxes on net share settlements of equity awards		(21,000,000)		(29,000,000)	(26,000,000)
Payments of finance lease obligation (Note 7)		(6,000,000)		(5,000,000)
Net cash provided by (used in) financing activities		341,000,000		(580,000,000)	(358,000,000)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		8,000,000		(4,000,000)	(16,000,000)
Net increase (decrease) in cash, cash equivalents and restricted cash		99,000,000		(336,000,000)	(18,000,000)
Cash, cash equivalents and restricted cash at beginning of period		319,000,000		655,000,000	673,000,000
Cash, cash equivalents and restricted cash at end of period		418,000,000		319,000,000	655,000,000
Supplemental disclosure of cash flow information:
Cash paid during the period for income taxes, net of refunds		3,000,000		47,000,000	53,000,000
Cash paid during the period for interest		13,000,000		6,000,000	8,000,000
Supplemental disclosure of non-cash investing and financing activities:
Stock-based compensation capitalized with internal-use software and website development costs (Note 15)		15,000,000		19,000,000	13,000,000
Equity method investment acquired for non-cash consideration (Note 5)				$ 41,000,000
2015 Credit Facility
Financing activities:
Proceeds from credit facility		700,000,000			5,000,000
Payments to credit facility		$ (700,000,000)			(235,000,000)
Chinese Credit Facilities
Financing activities:
Proceeds from credit facility					2,000,000
Payments to credit facility					$ (10,000,000)

[1] Represents a goodwill impairment charge related to our Tripadvisor China reporting unit.

[2] Primarily related to loss on disposal on the sale of our SmarterTravel business in June 2020