Tripadvisor (TRIP) 10-K 17 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Feb. 06, 2015
Document And Entity Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	TripAdvisor, Inc.
Trading Symbol	TRIP
Entity Central Index Key	1526520
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$12,115,385,937
Common Stock, Unclassified
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding			130,126,683
Class B Common Stock
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding			12,799,999

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Revenue (Note 2)	$1,246		$945		$763
Costs and expenses:
Cost of revenue	40	[1]	18	[1]	12	[1]
Selling and marketing	502	[2]	368	[2]	266	[2]
Technology and content	171	[2]	131	[2]	87	[2]
General and administrative	128	[2]	98	[2]	76	[2]
Depreciation	47	[3]	30	[3]	20	[3]
Amortization of intangible assets	18		6		6
Total costs and expenses:	906		651		467
Operating income	340		294		296
Other income (expense):
Interest expense	-9		-10		-11
Interest income and other, net	-9				-3
Total other expense, net	-18		-10		-14
Income before income taxes	322		284		282
Provision for income taxes	-96		-79		-87
Net income	226		205		195
Net (income) loss attributable to noncontrolling interest					1
Net income attributable to TripAdvisor, Inc.	$226		$205		$194
Earnings per share attributable to TripAdvisor, Inc. available to common stockholders (Note 2):
Basic	$1.58		$1.44		$1.39
Diluted	$1.55		$1.41		$1.37
Weighted average common shares outstanding (Note 2):
Basic	142,721		142,854		139,462
Diluted	145,800		145,263		141,341
[1]	Excludes amortization as follows:
[2]	Includes stock-based compensation expense as follows:
[3]	Includes amortization of internal use software and website development costs.

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Costs and expenses:
Amortization of intangible assets	$18		$6		$6
Depreciation	47	[1]	30	[1]	20	[1]
Amortization adjustment	34		21		14
Stock-based compensation:
Stock-based compensation	63		49		30
Acquired technology
Costs and expenses:
Amortization of intangible assets	4		1		1
Website development costs
Costs and expenses:
Depreciation	30		20		13
Selling and Marketing
Stock-based compensation:
Stock-based compensation	13		11		5
Technology and Content
Stock-based compensation:
Stock-based compensation	27		21		11
General and Administrative
Stock-based compensation:
Stock-based compensation	$23		$17		$14
[1]	Includes amortization of internal use software and website development costs.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$226		$205		$195
Other comprehensive income (loss):
Foreign currency translation adjustments	-31	[1]	1	[1]	2	[1]
Total other comprehensive (loss) income	-31		1		2
Comprehensive income	195		206		197
Less: comprehensive income attributable to noncontrolling interest					-1
Comprehensive income attributable to TripAdvisor, Inc.	$195		$206		$196
[1]	Foreign currency translation adjustments exclude income taxes due to our practice and intention to indefinitely reinvest the earnings of our foreign subsidiaries in those operations. See “Note 14 — Stockholders’ Equity”.

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents (Note 5)	$455	$351
Short-term marketable securities (Note 5)	108	131
Accounts receivable, net of allowance for doubtful accounts of $7 and $3 at December 31, 2014 and December 31, 2013, respectively (Note 2)	151	113
Prepaid expenses and other current assets	33	35
Total current assets	747	630
Long-term assets:
Long-term marketable securities (Note 5)	31	188
Property and equipment, net (Note 6)	195	82
Other long-term assets	38	19
Intangible assets, net (Note 7)	214	52
Goodwill (Note 7)	734	502
TOTAL ASSETS	1,959	1,473
Current liabilities:
Accounts payable	19	10
Deferred merchant payables (Note 2)	93	30
Deferred revenue	57	44
Credit facility borrowings (Note 8)	38	28
Borrowings, current (Note 8)	40	40
Taxes payable (Note 9)	20	5
Accrued expenses and other current liabilities (Note 10)	114	86
Total current liabilities	381	243
Deferred income taxes, net (Note 9)	39	13
Other long-term liabilities (Note 11)	154	52
Borrowings, net of current portion (Note 8)	260	300
Total Liabilities	834	608
Commitments and contingencies (Note 12)
Stockholders’ equity: (Note 14)
Preferred stock, $0.001 par value Authorized shares: 100,000,000 Shares issued and outstanding: 0 and 0
Additional paid-in capital	673	608
Retained earnings	628	402
Accumulated other comprehensive income (loss)	-31
Treasury stock-common stock, at cost, 2,194,173 and 2,120,709 shares	-145	-145
Total Stockholders’ Equity	1,125	865
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$1,959	$1,473

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Allowance for doubtful accounts	$7	$3
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,600,000,000	1,600,000,000
Common stock, shares issued	132,315,465	131,537,798
Common stock, shares outstanding	130,121,292	129,417,089
Treasury stock, shares	2,194,173	2,120,709
Class B Common Stock
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	12,799,999	12,799,999
Common stock, shares outstanding	12,799,999	12,799,999

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total		Class B Common Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
In Millions, except Share data	USD ($)				USD ($)	USD ($)	USD ($)	USD ($)
Beginning balance at Dec. 31, 2011	$294				$294	$3	($3)
Beginning balance, shares at Dec. 31, 2011			12,799,999	120,661,808
Net income attributable to TripAdvisor, Inc.	194					194
Foreign currency translation adjustments	2	[1]					2
Issuance of common stock related to exercise of options, warrants and vesting of RSUs	231				231
Issuance of common stock related to exercise of options, warrants and vesting of RSUs, shares				9,398,330
Tax benefits on equity awards, net	4				4
Minimum withholding taxes on net share settlements of equity awards	-7				-7
Adjustment to the fair value of redeemable noncontrolling interest	-15				-15
Reclassification of non-employee equity awards to liability	-2				-2
Stock-based compensation	26				26
Ending balance at Dec. 31, 2012	727				531	197	-1
Ending balance, shares at Dec. 31, 2012			12,799,999	130,060,138
Net income attributable to TripAdvisor, Inc.	205					205
Foreign currency translation adjustments	1	[1]					1
Issuance of common stock related to exercise of options, warrants and vesting of RSUs	27				27
Issuance of common stock related to exercise of options, warrants and vesting of RSUs, shares				1,477,660
Repurchase of common stock	-145							-145
Repurchase of common stock, shares								-2,120,709
Tax benefits on equity awards, net	12				12
Minimum withholding taxes on net share settlements of equity awards	-14				-14
Stock-based compensation	52				52
Ending balance at Dec. 31, 2013	865				608	402		-145
Ending balance, shares at Dec. 31, 2013			12,799,999	131,537,798				-2,120,709
Net income attributable to TripAdvisor, Inc.	226					226
Foreign currency translation adjustments	-31	[1]					-31
Issuance of common stock related to exercise of options, warrants and vesting of RSUs	3				3
Issuance of common stock related to exercise of options, warrants and vesting of RSUs, shares	1,202,000	[2]		777,667
Repurchase of common stock	-145
Repurchase of common stock, shares	2,120,709
Tax benefits on equity awards, net	20				20
Minimum withholding taxes on net share settlements of equity awards	-33				-33
Fair value of stock options assumed in connection with acquisition	5				5
Stock-based compensation	70				70
Other, shares								-73,464
Ending balance at Dec. 31, 2014	$1,125				$673	$628	($31)	($145)
Ending balance, shares at Dec. 31, 2014			12,799,999	132,315,465				-2,194,173
[1]	Foreign currency translation adjustments exclude income taxes due to our practice and intention to indefinitely reinvest the earnings of our foreign subsidiaries in those operations. See “Note 14 — Stockholders’ Equity”.
[2]	Inclusive of 628,010 options, which were not converted into shares due to net share settlement in order to cover the aggregate exercise price and the minimum amount of required employee withholding taxes. Potential shares which had been convertible under stock options that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Incentive Plan and can be reissued by the Company. We began net-share settling the majority of our stock option exercises during the third quarter of 2013. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating activities:
Net income	$226		$205		$195
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment, including amortization of internal-use software and website development	47	[1]	30	[1]	20	[1]
Stock-based compensation expense	63		49		30
Amortization of intangible assets	18		6		6
Amortization of deferred financing costs	1		1		1
Amortization of discounts and premiums on marketable securities, net	3		5		1
Deferred tax (benefit) expense	-17		5		-5
Excess tax benefits from stock-based compensation	-20		-12		-3
Provision (recovery) for doubtful accounts	3		1		-1
Other, net	11		1		1
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, prepaid expenses and other assets (Note 2)	-26		-12		-32
Accounts payable, accrued expenses and other liabilities	18		17		32
Deferred merchant payables	-9		17		-1
Income taxes, net	60		27		-17
Deferred revenue	9		9		12
Net cash provided by operating activities	387		349		239
Investing activities:
Acquisitions, net of cash acquired	-331		-35		-3
Capital expenditures, including internal-use software and website development	-81		-55		-29
Purchases of marketable securities	-251		-432		-219
Sales of marketable securities	336		175
Maturities of marketable securities	93		151
Distributions proceeds from Expedia related to Spin-Off					7
Net cash used in investing activities	-234		-196		-244
Financing activities:
Repurchase of common stock			-145
Proceeds from credit facilities	13		10		15
Payments to credit facilities	-3		-15		-10
Principal payments on long-term debt	-40		-40		-20
Proceeds from exercise of stock options and warrants	3		24		231
Payment of minimum withholding taxes on net share settlements of equity awards	-33		-14		-7
Excess tax benefits from stock-based compensation	20		12		3
Payments to purchase subsidiary shares from noncontrolling interest					-22
Payments on construction in-process related to build to suit lease obligation	-1		-2
Net cash (used in) provided by financing activities	-41		-170		190
Effect of exchange rate changes on cash and cash equivalents	-8		1		-1
Net increase (decrease) in cash and cash equivalents	104		-16		184
Cash and cash equivalents at beginning of period	351		367		183
Cash and cash equivalents at end of period	455		351		367
Supplemental disclosure of cash flow information
Cash paid during the period for income taxes, net of refunds	54		50		108
Cash paid during the period for interest	7		8		10
Supplemental disclosure of non-cash investing and financing activities:
Capitalization of construction in-process related to build to suit lease obligation	52		8
Capital expenditures incurred but not yet paid primarily related to build to suit lease	10
Non-cash fair value increase for redeemable noncontrolling interests					$15
[1]	Includes amortization of internal use software and website development costs.

Organization_and_Business_Desc

Organization and Business Description	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Organization and Business Description	NOTE 1: ORGANIZATION AND BUSINESS DESCRIPTION
	We refer to TripAdvisor, Inc. and our wholly-owned subsidiaries as “TripAdvisor,” “the Company,” “us,” “we” and “our” in these notes to the consolidated financial statements.
	During 2011, Expedia announced its plan to separate into two independent public companies in order to better achieve certain strategic objectives of its various businesses. On December 20, 2011 Expedia completed the spin-off of TripAdvisor into a separate publicly traded Delaware corporation. We refer to this transaction as the “Spin-Off.” TripAdvisor’s common stock began trading on the NASDAQ as an independent public company on December 21, 2011 under the trading symbol “TRIP.”
	On December 11, 2012, Liberty Interactive Corporation, or Liberty, purchased an aggregate of 4,799,848 shares of common stock of TripAdvisor from Barry Diller, our former Chairman of the Board of Directors and Senior Executive, and certain of his affiliates (the “Stock Purchase”). As a result, Liberty beneficially owned 18,159,752 shares of our common stock and 12,799,999 shares of our Class B common stock.
	On August 27, 2014, the entire beneficial ownership of our common stock and Class B common stock held by Liberty was indirectly acquired by Liberty TripAdvisor Holdings, Inc. (“LTRIP”) by means of a spin-off (the “Liberty Spin-Off”). In the Liberty Spin-Off, Liberty, LTRIP’s former parent company, distributed, by means of a dividend, to the holders of its Liberty Ventures common stock, Liberty’s entire equity interest in LTRIP.  As a result of the Liberty Spin-Off, LTRIP became a separate, publicly traded company and 100% of Liberty’s interest in TripAdvisor is now held by LTRIP.
	As December 31, 2014, LTRIP beneficially owned 18,159,752 shares of our common stock and 12,799,999 shares of our Class B common stock, which shares constitute 14.0% of the outstanding shares of Common Stock and 100% of the outstanding shares of Class B Common Stock. Assuming the conversion of all of LTRIP’s shares of Class B common stock into common stock, LTRIP would beneficially own 21.7% of the outstanding common stock (calculated in accordance with Rule 13d-3). Because each share of Class B common stock generally is entitled to ten votes per share and each share of common stock is entitled to one vote per share, LTRIP may be deemed to beneficially own equity securities representing approximately 56.6% of our voting power.
	Description of Business
	TripAdvisor is an online travel company, empowering users to plan and book the perfect trip. TripAdvisor’s travel research platform aggregates reviews and opinions of members about accommodations, destinations, activities and attractions, and restaurants, throughout the world so that our users have access to trusted advice wherever their trip takes them. Our platform not only helps users plan their trip with our unique user-generated content, but also enables users to compare real-time pricing and availability so that they can book hotels, vacation rentals, flights, activities and attractions, and restaurants.
	Our flagship brand is TripAdvisor.  TripAdvisor-branded websites include tripadvisor.com in the United States and localized versions of the website in 45 countries including in China under the brand daodao.com. In addition to the flagship TripAdvisor brand, we manage and operate 24 other media brands, connected by the common goal of providing comprehensive travel planning resources across the travel sector, which include; www.airfarewatchdog.com, www.bookingbuddy.com, www.cruisecritic.com, www.everytrail.com, www.familyvacationcritic.com, www.flipkey.com, www.gateguru.com, www.holidaylettings.co.uk, www.holidaywatchdog.com, www.independenttraveler.com, www.jetsetter.com, www.thefork.com (including www.lafourchette.com, www.eltenedor.com and www.iens.nl), www.niumba.com, www.onetime.com, www.oyster.com, www.seatguru.com, www.smartertravel.com, www.tingo.com, www.travelpod.com, www.tripbod.com, www.vacationhomerentals.com, www.viator.com, www.virtualtourist.com, and www.kuxun.cn. For further description of our other travel brands see Item 1, Business.
	We derive substantially all of our revenue through the sale of advertising, primarily through click-based advertising and, to a lesser extent, display-based advertising. In addition, we earn revenue from a combination of subscription-based and transaction-based offerings, including: Business Listings; subscription and commission-based offerings from our Vacation Rentals products; transaction revenue from selling room nights through our Jetsetter and Tingo brands; selling destination activities from Viator; fulfilling online restaurant reservations through Lafourchette; as well as other revenue including content licensing.
	We have two reportable segments: Hotel and Other. Our Other segment consists of the aggregation of three operating segments, which include our Vacation Rentals, Restaurants and Attractions businesses. Our operating segments are determined based on how our chief operating decision maker manages our business, regularly assesses information and evaluates performance for operating decision-making purposes, including allocation of resources.  For further information on our reportable segments see “Note 16 — Segment and Geographic Information,” in the notes to our consolidated financial statements.
	Seasonality
	Expenditures by travel advertisers tend to be seasonal. Traditionally, our strongest quarter has been the third quarter, which is a key travel research period, with the weakest quarter being the fourth quarter. However, adverse economic conditions or continued growth of our international operations with differing holiday peaks may influence the typical trend of our seasonality in the future.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies	NOTE 2: SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation
	The accompanying consolidated financial statements include TripAdvisor, our wholly-owned subsidiaries, and entities we control, or in which we have a variable interest and are the primary beneficiary of expected cash profits or losses. We record noncontrolling interest in our consolidated financial statements to recognize the minority ownership interest in our consolidated subsidiaries. Noncontrolling interest in the earnings and losses of consolidated subsidiaries represent the share of net income or loss allocated to members or partners in our consolidated entities. We have eliminated significant intercompany transactions and accounts. The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”).
	Certain of our subsidiaries that operate in China, have variable interests in affiliated entities in China in order to comply with Chinese laws and regulations, which restrict foreign investment in Internet content provision businesses. Although we do not own the capital stock of some of our Chinese affiliates, we consolidate their results as we are the primary beneficiary of the cash losses or profits of these variable interest affiliates and have the power to direct the activities of these affiliates. Our variable interest entities are not material for all periods presented.
	Accounting Estimates
	We use estimates and assumptions in the preparation of our consolidated financial statements in accordance with GAAP. Our estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of our consolidated financial statements. These estimates and assumptions also affect the reported amount of net income or loss during any period. Our actual financial results could differ significantly from these estimates. The significant estimates underlying our consolidated financial statements include; (i) recoverability of intangible assets and goodwill; (ii) recoverability and useful life of long-lived assets; (iii) accounting for income taxes; (iv) purchase accounting for business combinations and (v) stock-based compensation.
	Reclassifications
	As previously disclosed, we no longer consider Expedia a related party. Certain reclassifications have been made to conform the prior period to the current presentation relating to Expedia transactions, which includes the reclassification of revenue from Expedia on our statements of operations for the years ended December 31, 2013 and 2012 of $217 million and $204 million, respectively, to revenue, the reclassification of receivables at December 31, 2013 of $16 million, from Expedia, net on our consolidated balance sheets to accounts receivable, as well as operating cash flow reclassifications related to Expedia for the years ended December 31, 2013 and 2012 of cash provided of $8 million and cash used of $17 million, respectively, to operating cash flows for accounts receivable on our consolidated statements of cash flows those years. These reclassifications had no net effect on our consolidated financial statements.
	In addition, as discussed above, we revised our reportable segment structure during the fourth quarter of 2014. Consequently all prior periods have been reclassified to conform to the current reporting structure, which is reflected in all required segment disclosures made in this Form 10-K. These reclassifications had no effect on our consolidated financial statements.
	All other reclassifications, made to conform the prior period to the current presentation, were not material and had no net effect on our consolidated financial statements.
	Revenue Recognition
	We recognize revenue from our services rendered when the following four revenue recognition criteria are met: persuasive evidence of an arrangement exists, services have been rendered, the price is fixed or determinable, and collectability is reasonably assured. Deferred revenue, which primarily relates to our subscription-based and commission based arrangements, is recorded when payments are received in advance of our performance as required by the underlying agreements.
	Click-based Advertising. Revenue is derived primarily from click-through fees charged to our travel partners for traveler leads sent to the travel partners’ website. We record revenue from click-through fees after the traveler makes the click-through to the travel partners’ websites.
	Instant booking commission revenue is recorded at the time a traveler books a hotel transaction on our site where we do not assume cancellation risk. In transactions in which we assume cancellation risk, we record revenue when we receive cash from our travel partners, given the current uncertainty of the traveler’s stay.  We have no post-booking service obligations for Instant Booking transactions.
	Display-based Advertising. We recognize display advertising revenue ratably over the advertising period or upon delivery of advertising impressions, depending on the terms of the advertising contract. Subscription-based revenue is recognized ratably over the related contractual period over which service is delivered.
	Attractions. We receive cash from the consumer at the time of booking of the destination activity and record these amounts, net of commissions, as deferred merchant payables on our consolidated balance sheet. Commission revenue is recorded as deferred revenue at the time of booking and later recognized when the consumer has completed the destination activity or as the consumer’s refund privileges lapse. We pay the destination activity operators after the travelers’ use.
	Restaurants. We recognize reservation revenues (or per seated diner fees) on a transaction-by-transaction basis as diners are seated by our restaurant customers. Subscription-based revenue is recognized ratably over the related contractual period over which the service is delivered.
	Vacation Rentals. We generate revenue from customers for online advertising listing services related to the listing of their properties for rent on a subscription basis, over a fixed-term, or on a free-to-list option. Payments for term-based paid subscriptions received in advance of services being rendered are recorded as deferred revenue and recognized ratably on a straight-line basis over the listing period. We generate commission revenue from our free-to-list bookings option. We receive cash from travelers at the time of booking, net of commissions, and record as deferred merchant payables on our consolidated balance sheet. Commission revenue is recorded as deferred revenue at the time of booking and later recognized when the traveler has completed the stay or as the travelers’ refund privileges lapse. We pay the customer or property owner after the travelers’ stay.
	Cost of Revenue
	Cost of revenue consists of expenses that are directly related or closely correlated to revenue generation, including direct costs, such as ad serving fees, flight search fees, transaction fees and data center costs.  In addition, cost of revenue includes personnel and overhead expenses, including salaries, benefits, stock-based compensation and bonuses for certain customer support personnel who are directly involved in revenue generation.
	Selling and Marketing
	Sales and marketing expenses primarily consist of direct costs, including SEM and other online traffic acquisition costs, syndication costs and affiliate program commissions, brand advertising, television and other offline advertising, and public relations. In addition, our indirect sales and marketing expense consists of personnel and overhead expenses, including salaries, commissions, benefits, stock-based compensation expense and bonuses for sales, sales support, customer support and marketing employees.
	Technology and Content
	Technology and content expenses consist of personnel and overhead expenses, including salaries and benefits, stock-based compensation expense and bonuses for salaried employees and contractors engaged in the design, development, testing, content support, and maintenance of our websites and mobile apps. Other costs include licensing, maintenance expense, computer supplies, and technology hardware.
	General and Administrative
	General and administrative expense consists primarily of personnel and related overhead costs, including executive leadership, finance, legal and human resource functions and stock-based compensation as well as professional service fees and other fees including audit, legal, tax and accounting, and other costs including bad debt expense and our charitable foundation costs.
	Interest Income and Other, net
	Interest income and other, net primarily consists of interest earned and amortization of discounts and premiums on our marketable securities, and net foreign exchange gains and losses.
	Interest Expense
	Interest expense primarily consists of interest incurred, commitment fees and debt issuance cost amortization related to our Credit Agreement and Chinese Credit Facilities.
	Cash, Cash Equivalents and Marketable Securities
	Our cash equivalents consist of highly liquid investments with maturities of 90 days or less at the date of purchase. Our marketable debt and equity securities have been classified and accounted for as available-for-sale. We determine the appropriate classification of our investments at the time of purchase and reevaluate the designations at each balance sheet date. We invest in highly-rated securities, and our investment policy limits the amount of credit exposure to any one issuer, industry group and currency. The policy requires investments to be investment grade, with the primary objective of minimizing the potential risk of principal loss and providing liquidity of investments sufficient to meet our operating and capital spending requirements and debt repayments.
	We classify our marketable debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date and as to whether and when we intend to sell a particular security prior to its maturity date. Marketable debt securities with maturities greater than 90 days at the date of purchase and 12 months or less remaining at the balance sheet date will be classified as short-term and marketable debt securities with maturities greater than 12 months from the balance sheet date will generally be classified as long-term. We classify our marketable equity securities, limited to money market funds and mutual funds, as either short-term or long-term based on the nature of each security and its availability for use in current operations. Our marketable debt and equity securities are carried at fair value, with the unrealized gains and losses, net of taxes, reported in accumulated other comprehensive income (loss) as a component of stockholders’ equity. Fair values are determined for each individual security in the investment portfolio.
	Realized gains and losses on the sale of securities are determined by specific identification of each security’s cost basis. We may sell certain of our marketable securities prior to their stated maturities for strategic reasons including, but not limited to, anticipation of credit deterioration and liquidity and duration management. The weighted average maturity of our total invested cash shall not exceed 18 months, and no security shall have a final maturity date greater than three years.
	We continually review our available for sale securities to determine whether a decline in fair value below the carrying value is other than temporary. When evaluating an investment for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, and our intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s cost basis. Once a decline in fair value is determined to be other than temporary, an impairment charge is recorded and a new cost basis in the investment is established. If we do not intend to sell the debt security, but it is probable that we will not collect all amounts due, then only the impairment due to the credit risk would be recognized in earnings and the remaining amount of the impairment would be recognized in accumulated other comprehensive loss within stockholders’ equity.
	Cash consists of cash deposits held in global financial institutions.
	Fair Value Measurements
	We apply fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. We measure assets and liabilities at fair value based on the expected exit price, which is the amount that would be received on the sale of an asset or amount paid to transfer a liability, as the case may be, in an orderly transaction between market participants in the principal or most advantageous market in which we would transact. As such, fair value may be based on assumptions that market participants would use in pricing an asset or liability at the measurement date. The authoritative guidance on fair value measurements establishes a consistent framework for measuring fair value on either a recurring or nonrecurring basis whereby inputs, used in valuation techniques, are assigned a hierarchical level. The following are the hierarchical levels of inputs to measure fair value:
	Level 1—Valuations are based on quoted prices for identical assets and liabilities in active markets.
	Level 2—Valuations are based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.
	Level 3—Valuations are based on unobservable inputs reflecting our own assumptions, consistent with reasonably available assumptions made by other market participants. These valuations require significant judgment.
	Derivative Financial Instruments
	Our goal in managing our foreign exchange risk is to reduce, to the extent practicable, our potential exposure to the changes that exchange rates might have on our earnings, cash flows and financial position. We do not use derivatives for trading or speculative purposes.  We account for our derivative instruments as either assets or liabilities and carry them at fair value.
	For derivative instruments that hedge the exposure to variability in expected future cash flows that are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity and reclassified into income in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument, if any, is recognized in current income. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions. For options designated as cash flow hedges, changes in the time value are excluded from the assessment of hedge effectiveness and are recognized in income. For derivative instruments that hedge the exposure to changes in the fair value of an asset or a liability and that are designated as fair value hedges, both the net gain or loss on the derivative instrument as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in earnings in the current period. The net gain or loss on the effective portion of a derivative instrument that is designated as an economic hedge of the foreign currency translation exposure of the net investment in a foreign operation is reported in the same manner as a foreign currency translation adjustment. For forward exchange contracts designated as net investment hedges, we exclude changes in fair value relating to changes in the forward carrying component from its definition of effectiveness. Accordingly, any gains or losses related to this component are recognized in current income. We have not entered into any cash flow, fair value or net investment hedges to date as of December 31, 2014.
	Derivatives that do not qualify for hedge accounting must be adjusted to fair value through current income. In certain circumstances, we enter into foreign currency forward exchange contracts (“forward contracts”) to reduce the effects of fluctuating foreign currency exchange rates on our cash flows denominated in foreign currencies. Our derivative instruments or forward contracts entered into are not designated as hedges as of December 31, 2014 are disclosed below in “Note 5— Financial Instruments” in the notes to the consolidated financial statements. Monetary assets and liabilities denominated in a currency other than the functional currency of a given subsidiary are remeasured at spot rates in effect on the balance sheet date with the effects of changes in spot rates reported in other, net on our consolidated statements of operations. Accordingly, fair value changes in the forward contracts help mitigate the changes in the value of the remeasured assets and liabilities attributable to changes in foreign currency exchange rates, except to the extent of the spot-forward differences. These differences are not expected to be significant due to the short-term nature of the contracts, which to date, have generally had maturities at inception of 90 days or less.  The net cash received or paid related to our derivative instruments are classified as an operating activity in our consolidated statements of cash flow, which is based on the objective of the derivative instruments. These net cash flows have not been material in any reporting period to date.
	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are generally due within 30 days and are recorded net of an allowance for doubtful accounts. We record accounts receivable at the invoiced amount. Collateral is not required for accounts receivable. We consider accounts outstanding longer than the contractual payment terms as past due. We determine our allowance by considering a number of factors, including the length of time trade accounts receivable are past due, previous loss history, a specific customer’s ability to pay its obligations to us, and the condition of the general economy and industry as a whole.
	The following table presents the changes in the allowance for doubtful accounts for the periods presented:
			December 31,
			2014		2013			2012
			(in millions)
	Allowance for doubtful accounts:
	Balance, beginning of period		$	3	$	3		$	5
	Charges (recoveries) to earnings			3		1			(1	)
	Write-offs, net of recoveries and other adjustments			1		(1	)		(1	)
	Balance, end of period		$	7	$	3		$	3
	Property and Equipment, Including Website and Software Development Costs
	We record property and equipment at cost, net of accumulated depreciation. We capitalize certain costs incurred during the application development stage related to the development of websites and internal use software when it is probable the project will be completed and the software will be used as intended. Capitalized costs include internal and external costs, if direct and incremental, and deemed by management to be significant. We expense costs related to the planning and post-implementation phases of software and website development as these costs are incurred. Maintenance and enhancement costs (including those costs in the post-implementation stages) are typically expensed as incurred, unless such costs relate to substantial upgrades and enhancements to the website or software resulting in added functionality, in which case the costs are capitalized.
	We compute depreciation using the straight-line method over the estimated useful lives of the assets, which is three to five years for computer equipment, capitalized software and website development, office furniture and other equipment. We depreciate leasehold improvements using the straight-line method, over the shorter of the estimated useful life of the improvement or the remaining term of the lease.
	Leases
	We lease office space in several countries around the world under non-cancelable lease agreements. We generally lease our office facilities under operating lease agreements. Office facilities subject to an operating lease and the related lease payments are not recorded on our balance sheet. The terms of certain lease agreements provide for rental payments on a graduated basis, however, we recognize rent expense on a straight-line basis over the lease period in accordance with GAAP. Any lease incentives are recognized as reductions of rental expense on a straight-line basis over the term of the lease. The lease term begins on the date we become legally obligated for the rent payments or when we take possession of the office space, whichever is earlier.
	We establish assets and liabilities for the estimated construction costs incurred under lease arrangements where we are considered the owner for accounting purposes only, or build-to-suit leases, to the extent we are involved in the construction of structural improvements or take construction risk prior to commencement of a lease. Upon occupancy of facilities under build-to-suit leases, we assess whether these arrangements qualify for sales recognition under the sale-leaseback accounting guidance under GAAP. If we continue to be the deemed owner, for accounting purposes, the facilities are accounted for as financing obligations.
	We establish assets and liabilities for the present value of estimated future costs to return certain of our leased facilities to their original condition for asset retirement obligations. Such assets are depreciated over the lease period into operating expense, and the recorded liabilities are accreted to the future value of the estimated restoration costs.
	Business Combination Valuations and Recoverability of Goodwill and Indefinite-Lived Intangible Assets
Goodwill
We account for acquired businesses using the purchase method of accounting which requires that the assets acquired and liabilities assumed be recorded at the date of acquisition at their respective fair values. Any excess of the purchase price over the estimated fair values of the net assets acquired is recorded as goodwill. We assess goodwill, which is not amortized, for impairment annually as of October 1, or more frequently, if events and circumstances indicate impairment may have occurred. We test goodwill for impairment at the reporting unit level (operating segment or one level below an operating segment). Goodwill is allocated to our reporting units at the date the goodwill is initially recorded. Once goodwill has been allocated to the reporting units, it no longer retains its identification with a particular acquisition and becomes identified with the reporting unit in its entirety. Accordingly, the fair value of the reporting unit as a whole is available to support the recoverability of its goodwill.
In the evaluation of goodwill for impairment, we generally first perform a qualitative assessment to determine whether it is more likely than not (i.e., a likelihood of more than 50%) that the implied fair value of the reporting unit is less than the carrying amount. If we determine that it is not more likely than not that the implied fair value of the goodwill is less than its carrying amount, no further testing is necessary. If, however, we determine that it is more likely than not that the implied fair value of the goodwill is less than its carrying amount, we then perform a quantitative assessment and compare the implied fair value of the reporting unit to the carrying value. If the carrying value of a reporting unit exceeds its implied fair value, the goodwill of that reporting unit is potentially impaired and we proceed to step two of the impairment analysis. In step two of the analysis, we will record an impairment loss equal to the excess of the carrying value of the reporting unit’s goodwill over its implied fair value should such a circumstance arise.
In determining the estimated fair value of assets acquired and liabilities assumed in business combinations and for determining implied fair values of reporting units in a quantitative goodwill impairment test, we use one of the following recognized valuation methods: the income approach (including discounted cash flows), the market approach or the cost approach. Our significant estimates in those fair value measurements include identifying business factors such as size, growth, profitability, risk and return on investment and assessing comparable revenue and operating income multiples. Further, when measuring fair value based on discounted cash flows, we make assumptions about risk-adjusted discount rates, future price levels, rates of increase in revenue, cost of revenue, and operating expenses, weighted average cost of capital, rates of long-term growth, and income tax rates. Valuations are performed by management or third party valuation specialists under management's supervision, where appropriate. We believe that the fair values assigned to the assets acquired and liabilities assumed in business combinations and impairment tests are based on reasonable assumptions that marketplace participants would use. However, such assumptions are inherently uncertain and actual results could differ from those estimates.
As part of our qualitative assessment for our 2014 goodwill impairment analysis on October 1, the factors that we considered included, but were not limited to: (a) changes in macroeconomic conditions in the overall economy and the specific markets in which we operate, (b) our ability to access capital, (c) changes in the online travel industry, (d) changes in the level of competition, (e) comparison of our current financial performance to historical and budgeted results, and (f) changes in excess market capitalization over book value based on our current common stock price and latest unaudited consolidated balance sheet. After considering these factors and the impact that changes in such factors would have on the inputs used in our previous quantitative assessment, we determined that it was more likely than not that goodwill was not impaired.
Subsequent to the annual impairment test on October 1, 2014, as discussed in “Note 16—Segment and Geographic Information," the composition of our operating segments and our reporting units, has been revised. As a result of this revision, we performed an updated goodwill impairment analysis as of December 31, 2014, for each of our four reporting units which we have identified: Hotels, Vacation Rentals, Restaurants and Attractions.  As part of our qualitative assessment for our Hotel reporting unit, we considered the same factors used above in our October 1 qualitative assessment. As part of our process for our Vacation Rentals, Restaurants and Attractions reporting units, we began our qualitative analysis leveraging quantitative valuations for recent acquisitions in these reporting units, prepared by third party appraisers or management, which were used by management for initial purchase accounting required under GAAP. We then considered many of the same qualitative factors used in our October 1, 2014 qualitative assessment and the impact that changes in such factors would have on the inputs previously used in those recent quantitative valuations. After considering this information, we determined that, regarding all reporting units, it was more likely than not that these assets were not impaired at December 31, 2014.
Indefinite-Lived Intangible Assets
Intangible assets that have indefinite lives are not amortized and are tested for impairment annually on October 1, or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Similar to the qualitative assessment for goodwill, we may assess qualitative factors to determine if it is more likely than not that the implied fair value of the indefinite-lived intangible asset is less than its carrying amount. If we determine that it is not more likely than not that the implied fair value of the indefinite-lived intangible asset is less than its carrying amount, no further testing is necessary. If, however, we determine that it is more likely than not that the implied fair value of the indefinite-lived intangible asset is less than its carrying amount, we compare the implied fair value of the indefinite-lived asset with its carrying amount. If the carrying value of an individual indefinite-lived intangible asset exceeds its implied fair value, the individual asset is written down by an amount equal to such excess. The assessment of qualitative factors is optional and at our discretion. We may bypass the qualitative assessment for any indefinite-lived intangible asset in any period and resume performing the qualitative assessment in any subsequent period.
As part of our qualitative assessment for our 2014 impairment analysis on October 1, the factors that we considered for our indefinite-lived intangible assets included, but were not limited to: (a) changes in macroeconomic conditions in the overall economy and the specific markets in which we operate, (b) our ability to access capital, (c) changes in the online travel industry, (d) changes in the level of competition, (e) comparison of our current financial performance to historical and budgeted results, (f) changes in excess market capitalization over book value based on our current common stock price and latest unaudited consolidated balance sheet, and (g) comparison of the excess of the fair value of our trade names and trademarks to the carrying value of those same assets, using the results of our most recent quantitative assessment. After considering these factors and the impact that changes in such factors would have on the inputs used in our previous quantitative assessment, we determined that it was more likely than not that these assets were not impaired.
Since the annual impairment test on October 1, 2014, there have been no events or changes in circumstances to indicate any potential impairment to our indefinite lived intangible assets. In the event that future circumstances indicate that our indefinite-lived intangibles are impaired, an impairment charge would be recorded.
There were no impairment charges recognized to our consolidated statement of operations during the years ended December 31, 2014, 2013 and 2012 related to our goodwill or indefinite-lived intangible assets.
Recoverability of Intangible Assets with Definite Lives and Other Long-Lived Assets
Intangible assets with definite lives and other long-lived assets are carried at cost and are amortized on a straight-line basis over their estimated useful lives of two to twelve years. The straight-line method of amortization is currently used for our definite-lived intangible assets as it approximates, or is our best estimate, of the distribution of the economic use of our identifiable intangible assets. We review the carrying value of long-lived assets or asset groups, including property and equipment, to be used in operations whenever events or changes in circumstances indicate that the carrying amount of the assets might not be recoverable.
Factors that would necessitate an impairment assessment include a significant adverse change in the extent or manner in which an asset is used, a significant adverse change in legal factors or the business climate that could affect the value of the asset, or a significant decline in the observable market value of an asset, among others. If such facts indicate a potential impairment, we assess the recoverability of the asset by determining if the carrying value of the asset exceeds the sum of the projected undiscounted cash flows expected to result from the use and eventual disposition of the asset over the remaining economic life of the asset. If the recoverability test indicates that the carrying value of the asset is not recoverable, we will estimate the fair value of the asset using appropriate valuation methodologies which would typically include an estimate of discounted cash flows. Any impairment would be measured by the amount that the carrying value of such assets exceeds their fair value and would be included in operating income on the consolidated statement of operations. We have not identified any circumstances that would warrant an impairment assessment of any recorded assets in our consolidated balance sheet at December 31, 2014.
Income Taxes
We record income taxes under the asset and liability method. Deferred tax assets and liabilities reflect our estimation of the future tax consequences of temporary differences between the carrying amounts of assets and liabilities for book and tax purposes. We determine deferred income taxes based on the differences in accounting methods and timing between financial statement and income tax reporting. Accordingly, we determine the deferred tax asset or liability for each temporary difference based on the enacted tax rates expected to be in effect when we realize the underlying items of income and expense. We consider all relevant factors when assessing the likelihood of future realization of our deferred tax assets, including our recent earnings experience by jurisdiction, expectations of future taxable income, and the carryforward periods available to us for tax reporting purposes, as well as assessing available tax planning strategies. We may establish a valuation allowance to reduce deferred tax assets to the amount we believe is more likely than not to be realized. Due to inherent complexities arising from the nature of our businesses, future changes in income tax law, tax sharing agreements or variances between our actual and anticipated operating results, we make certain judgments and estimates. Therefore, actual income taxes could materially vary from these estimates.
We recognize in our consolidated financial statements the impact of a tax position, if that position is more likely than not to be sustained upon an examination, based on the technical merits of the position.
Foreign Currency Translation and Transaction Gains and Losses
Our consolidated financial statements are reported in U.S. dollars. Certain of our subsidiaries outside of the United States use the related local currency as their functional currency and not the U.S. dollar. Therefore assets and liabilities of our foreign subsidiaries are translated at the spot rate in effect at the applicable reporting date, and the consolidated statements of operations are translated at the average exchange rates in effect during the applicable period. The resulting unrealized cumulative translation adjustment is recorded as a component of accumulated other comprehensive income(loss) in stockholders’ equity on our consolidated balance sheet.
We also have subsidiaries that have transactions in foreign currencies other than their functional currency. Transactions denominated in currencies other than the functional currency are recorded based on exchange rates at the time such transactions arise. Subsequent changes in exchange rates result in transaction gains and losses which are reflected in our consolidated statements of operations as unrealized (based on the applicable period-end exchange rate) or realized upon settlement of the transactions, in other, net.
Accordingly, we have recorded foreign exchange losses of $10 million, $0 million and $3 million for the years ended December 31, 2014, 2013 and 2012, respectively, in other, net on our consolidated statement of operations. These amounts include gains and losses, realized and unrealized, on foreign currency forward contracts.
Advertising Expense
We incur advertising expense, which includes traffic generation costs from search engines and Internet portals, other online and offline (including television) advertising expense, promotions and public relations to promote our brands. We expense the costs associated with communicating the advertisements in the period in which the advertisement takes place. We initially capitalize and then expense the production costs associated with advertisements in the period in which the advertisement first takes place. For the years ended December 31, 2014, 2013 and 2012, our advertising expense was $341 million, $237 million, and $175 million, respectively. As of December 31, 2014 and 2013, we had $5 million and $1 million of prepaid marketing expenses included in prepaid expenses and other current assets.  We expect to fully expense our prepaid marketing asset of $5 million as of December 31, 2014 to the consolidated statement of operations during 2015.
Stock-Based Compensation
Stock Options. The exercise price for all stock options granted by us to date has been equal to the market price of the underlying shares of common stock at the date of grant. In this regard, when making stock option awards, our practice is to determine the applicable grant date and to specify that the exercise price shall be the closing price of our common stock on the date of grant.
The estimated grant-date fair value of stock options is calculated using a Black-Scholes Merton option-pricing model (“Black-Scholes model”). The Black-Scholes model incorporates assumptions to value stock-based awards, which includes the risk-free rate of return, expected volatility, expected term and expected dividend yield.
Our risk-free interest rate is based on the rates currently available on zero-coupon U.S. Treasury issues, in effect at the time of the grant, whose remaining maturity period most closely approximates the stock option’s expected term assumption. We have estimated, to date, the volatility of our common stock by using an average of our historical stock price volatility and of publicly traded companies that we consider peers based on daily price observations.  We have estimated our expected term, to date, using the simplified method, as we have not had sufficient historical exercise data on our common stock to date. Our expected dividend yield is zero, as we have not paid any dividends on our common stock to date and do not expect to pay any cash dividends for the foreseeable future.
Our stock options generally have a term of ten years from the date of grant and generally vest equitably over a four-year requisite service period. We amortize the grant-date fair value of our stock option grants, net of estimated forfeitures, as stock-based compensation expense over the vesting term on a straight-line basis, with the amount of compensation expense recognized at any date at least equaling the portion of the grant-date fair value of the award that is vested at that date.
As the Company now has three years of post-Spin-Off equity award activity, beginning in February 2015, we will change our method of estimating our expected term from the simplified method and use historical exercise behavior and expected post-vest termination data. Simultaneously, we will also begin estimating our expected volatility by equally weighting the historical volatility and implied volatility on our own stock.  Historical volatility will be determined using actual daily price observations of our stock price over a period equivalent to or approximate to the expected term of our stock option grants to date. Implied volatility represents the volatility of our actively traded options on our stock, with remaining maturities in excess of twelve months and market prices approximate to the exercise prices of the stock option grant. These changes are not expected to materially affect our future consolidated financial statements.
Restricted Stock Units. RSUs are stock awards that are granted to employees entitling the holder to shares of our common stock as the award vests. RSUs are measured at fair value based on the number of shares granted and the quoted price of our common stock at the date of grant. We amortize the fair value of RSUs, net of estimated forfeitures, as stock-based compensation expense over the vesting term of generally four years on a straight-line basis, with the amount of compensation expense recognized at any date at least equaling the portion of the grant-date fair value of the award that is vested at that date.
Performance-based stock options and RSUs vest upon achievement of certain company-based performance conditions and a requisite service period. On the date of grant, the fair value of performance-based award is determined based on the fair value, which is calculated using the same method as our service based stock options and RSUs described above. We then assess whether it is probable that the individual performance targets would be achieved. If assessed as probable, compensation expense will be recorded for these awards over the estimated performance period. At each reporting period, we will reassess the probability of achieving the performance targets and the performance period required to meet those targets. The estimation of whether the performance targets will be achieved and of the performance period required to achieve the targets requires judgment, and to the extent actual results or updated estimates differ from our current estimates, the cumulative effect on current and prior periods of those changes will be recorded in the period estimates are revised, or the change in estimate will be applied prospectively depending on whether the change affects the estimate of total compensation cost to be recognized or merely affects the period over which compensation cost is to be recognized. The ultimate number of shares issued and the related compensation expense recognized will be based on a comparison of the final performance metrics to the specified targets.
Estimates of fair value are not intended to predict actual future events or the value ultimately realized by employees who receive these awards, and subsequent events are not indicative of the reasonableness of our original estimates of fair value. We use historical data to estimate pre-vesting stock option and RSU forfeitures and record share-based compensation expense only for those awards that are expected to vest. Changes in estimated forfeitures are recognized through a cumulative catch-up adjustment in the period of change which also impacts the amount of stock compensation expense to be recognized in future periods.
Deferred Merchant Payables
We receive cash from travelers at the time of booking related to our vacation rental, attractions and transaction-based businesses and we record these amounts, net of commissions, on our consolidated balance sheets as deferred merchant payables. We pay the hotel, destination activity operators or vacation rental owners after the travelers’ use and subsequent billing from the hotel, attraction provider or vacation rental owners. Therefore, we receive cash from the traveler prior to paying the hotel, destination activity operator or vacation rental owners, and this operating cycle represents a working capital source or use of cash to us. As long as these businesses grow, we expect that changes in working capital related to these transactions, depending on timing of payments and seasonality, will continue to impact operating cash flows. Our deferred merchant payables balance was $93 million and $30 million for the years ended December 31, 2014 and 2013, respectively. A payable balance of $76 million was acquired during the year ended December 31, 2014, primarily related to our Viator acquisition (see “Note 3— Acquisitions”) and therefore is included within investing activities in our consolidated statement of cash flows.
Credit Risk and Concentrations
Financial instruments, which potentially subject us to concentration of credit risk, consist primarily of cash and cash equivalents, corporate debt securities, foreign exchange contracts, accounts receivable and customer concentrations. We maintain some cash and cash equivalents balances with financial institutions that are in excess of Federal Deposit Insurance Corporation insurance limits. Our cash and cash equivalents are primarily composed of prime institutional money market funds as well as bank account balances primarily denominated in U.S. dollars, Euros, British pound sterling, Chinese renminbi, Australian dollars and Singapore dollars. We invest in highly-rated corporate debt securities, and our investment policy limits the amount of credit exposure to any one issuer, industry group and currency. Our credit risk related to corporate debt securities is also mitigated by the relatively short maturity period required by our investment policy. Foreign exchange contracts are transacted with various international financial institutions with high credit standing.
Our business is also subject to certain risks due to concentrations related to dependence on our relationships with our customers. For the years ended December 31, 2014, 2013 and 2012 our two most significant advertising partners, Expedia and Priceline, each accounted for more than 10% of our consolidated revenue and combined accounted for 46%, 47% and 48% of our consolidated revenue, respectively. This concentration of revenue is recorded in our Hotel segment for these reporting periods. As of December 31, 2014 and 2013, Expedia accounted for 15% and 14%, respectively, of our total accounts receivable. Our overall credit risk related to accounts receivable is also mitigated by the relatively short collection period.
Contingent Liabilities
Periodically, we review the status of all significant outstanding matters to assess any potential financial exposure. When (i) it is probable that an asset has been impaired or a liability has been incurred and (ii) the amount of the loss can be reasonably estimated, we record the estimated loss in our consolidated statements of operations. We provide disclosure in the notes to the consolidated financial statements for loss contingencies that do not meet both these conditions if there is a reasonable possibility that a loss may have been incurred that would be material to the financial statements. Significant judgment is required to determine the probability that a liability has been incurred and whether such liability is reasonably estimable. We base accruals made on the best information available at the time which can be highly subjective. The final outcome of these matters could vary significantly from the amounts included in the accompanying consolidated financial statements.
Comprehensive Income (Loss)
Comprehensive income (loss) currently consists of net income, cumulative foreign currency translation adjustments, and unrealized gains and losses on available-for-sale securities, net of tax.
Basic Earnings Per Share
We compute basic earnings per share (“Basic EPS”) by dividing net income attributable to TripAdvisor by the weighted average number of common shares outstanding during the period. We compute the weighted average number of common shares outstanding during the reporting period using the total of common stock and Class B common stock outstanding as of the last day of the previous year end reporting period plus the weighted average of any additional shares issued and outstanding less the weighted average of any treasury shares repurchased during the reporting period.
Diluted Earnings Per Share
We compute diluted earnings per share (“Diluted EPS”) by dividing net income attributable to TripAdvisor by the sum of the weighted average number of common and common equivalent shares outstanding during the period. We computed the weighted average number of common and common equivalent shares outstanding during the period using the sum of (i) the number of shares of common stock and Class B common stock used in the basic earnings per share calculation as indicated above, and (ii) if dilutive, the incremental weighted average common stock that we would issue upon the assumed exercise of outstanding common equivalent shares related to stock options and the vesting of restricted stock units using the treasury stock method, and (iii) if dilutive, performance based awards based on the number of shares that would be issuable as of the end of the reporting period assuming the end of the reporting period was also the end of the contingency period.
Under the treasury stock method, the assumed proceeds calculation includes the actual proceeds to be received from the employee upon exercise, the average unrecognized compensation cost during the period and any tax benefits credited upon exercise to additional paid-in-capital. The treasury stock method assumes that a company uses the proceeds from the exercise of an award to repurchase common stock at the average market price for the period. Windfall tax benefits created upon the exercise of an award would be added to assumed proceeds, while shortfalls charged to additional paid-in-capital would be deducted from assumed proceeds. Any shortfalls not covered by the windfall tax pool would be charged to the income statement and would be excluded from the calculation of assumed proceeds, if any.
Below is a reconciliation of the weighted average number of shares of common stock outstanding in calculating Diluted EPS (shares in thousands and dollars in millions, except per share amounts) for the periods presented:
		Year ended December 31,
		2014		2013			2012
Numerator:
Net income		$	226	$	205		$	194
Denominator:
Weighted average shares used to compute			142,721		142,854			139,462
Basic EPS
Weighted average effect of dilutive
securities:
Stock options			2,734		2,131			1,207
RSUs			345		278			161
Stock warrants			-		-			511
Weighted average shares used to compute			145,800		145,263			141,341
Diluted EPS
Basic EPS		$	1.58	$	1.44		$	1.39
Diluted EPS		$	1.55	$	1.41		$	1.37
The following potential common shares related to stock options and RSUs were excluded from the calculation of Diluted EPS because their effect would have been anti-dilutive for the periods presented:
		Year ended December 31,
		2014(1)		2013(2)			2012(3)
Stock options			1,450		2,244			3,944
RSUs			191		27			21
Total			1,641		2,271			3,965
-1	These totals do not include 66,666 performance based options and 44,000 performance based RSUs representing the right to acquire 110,666 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
-2	These totals do not include 155,000 performance based options and 44,000 performance based RSUs representing the right to acquire 199,000 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
-3	These totals do not include 110,000 performance based options and 200,000 performance based RSUs representing the right to acquire 310,000 shares of common stock, respectively, for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
The earnings per share amounts are the same for common stock and Class B common stock because the holders of each class are legally entitled to equal per share distributions whether through dividends or in liquidation.
New Accounting Pronouncements Not Yet Adopted
Revenue From Contracts With Customers
In May 2014, the FASB issued new accounting guidance on revenue from contracts with customers.  The new guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The updated guidance will replace most existing revenue recognition guidance in GAAP when it becomes effective and permits the use of either a retrospective or cumulative effect transition method. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016.  We have not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures.
Recently Adopted Accounting Pronouncements
Pushdown Accounting
In November 2014, the FASB issued new accounting guidance that provides companies with the option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. The acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period as a change in accounting principle under GAAP. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. This guidance also requires an acquired entity that elects the option to apply pushdown accounting in its separate financial statements to disclose information in the current reporting period that enables users of financial statements to evaluate the effect of pushdown accounting. We have adopted this guidance effective November 18, 2014, as the amendments are effective upon issuance. The adoption of this new guidance did not have any impact on our consolidated financial statements and related disclosures.
Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
In July 2013, the FASB issued new accounting guidance on the presentation of unrecognized tax benefits. The new guidance requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows: to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use the deferred tax asset for such purpose, then the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This guidance was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2013, with early adoption permitted. Accordingly, we adopted these presentation requirements during the first quarter of 2014. The adoption of this new guidance did not have a material impact on our consolidated financial statements and related disclosures.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions	NOTE 3: ACQUISITIONS
	We acquired a number of businesses during the years ended December 31, 2014, 2013 and 2012.  These business combinations were accounted for as purchases of businesses under the acquisition method. The fair value of purchase consideration has been allocated to tangible and identifiable intangible assets acquired and liabilities assumed, based on their respective fair values on the acquisition date, with the remaining unallocated amount recorded as goodwill. Acquired goodwill represents the premium we paid over the fair value of the net tangible and intangible assets acquired. We paid a premium in these transactions for a number of reasons, but, primarily it was attributable to expected operational synergies, the assembled workforces, and the future development initiatives of the assembled workforces.  The results of each of these acquired businesses have been included in the consolidated financial statements beginning on the respective acquisition dates. Pro-forma results of operations for all of these acquisitions have not been presented as the financial impact to our consolidated financial statements, both individually and in aggregate, are not material.  For the years ended December 31, 2014 and 2013, acquisition-related costs were expensed as incurred and were $4 million and $2 million, respectively, and are included in general and administrative expenses on our consolidated statements of operations. Acquisition-related expenses were not material for the year ended December 31, 2012.
	2014 Acquisitions
	In August 2014, we completed our acquisition of Viator, Inc. (“Viator”).  Viator, which is headquartered in San Francisco and has offices in Las Vegas, London, and Sydney, is a leading resource for researching and booking destination activities around the world. Our total purchase price was $192 million, for all the outstanding shares of capital stock of Viator, consisting of approximately $187 million in cash consideration (or $132 million, net of cash acquired from Viator of $55 million) and the value of certain Viator stock options that were assumed. We issued 100,595 TripAdvisor stock options related to the assumed Viator stock options. The fair value of the earned portion of assumed stock options was $5 million and is included in the purchase price, with the remaining fair value of $3 million resulting in post-acquisition compensation expense that will generally be recognized ratably over three years from the date of acquisition.  The total cash consideration was paid from one of our U.S. based subsidiaries.
	During the year ended December 31, 2014, we completed six other acquisitions for a total purchase price consideration of $208 million, for which the Company paid total cash consideration of $199 million, which is net of cash acquired of $7 million and approximately $2 million in holdbacks for general representations and warranties of the respective sellers. The cash consideration was paid primarily from our international subsidiaries. We acquired 100% of the outstanding shares of capital stock for the following companies; Vacation Home Rentals, a U.S.-based vacation rental website featuring more than 14,000 properties around the world purchased in May 2014; London-based Tripbod, a travel community that helps connect travelers to local experts purchased in May 2014; Lafourchette, a provider of an online and mobile reservations platform for restaurants in Europe purchased in May 2014; MyTable and Restopolis, both providers of an online and mobile reservations platform for restaurants in Italy purchased in October 2014; and Iens, a provider of an online and mobile reservations platform for restaurants in the Netherlands purchased in December 2014. The purchase price consideration is subject to an adjustment based on the finalization of working capital adjustments for Restopolis and Iens, as of December 31, 2014.  During 2014, all 2014 acquisitions accounted for approximately 3% of consolidated revenue for the year.
	The purchase price allocation of our 2014 acquisitions, is preliminary and subject to revision as more information becomes available, but in any case will not be revised beyond twelve months after the acquisition date and any change to the fair value of assets acquired or liabilities assumed will lead to a corresponding change to the purchase price allocable to goodwill on a retroactive basis. The primary areas of the purchase price allocation that are not yet finalized are related to the fair values of intangibles assets and net assets for Iens, net assets of Viator, and income tax related balances for all 2014 acquisitions.  Acquired goodwill related to our 2014 acquisitions was allocated to our Other segment.
	The following table presents the purchase price allocations initially recorded on our consolidated balance sheet for all 2014 acquisitions (in millions):
			Total
	Goodwill (1)		$	253
	Intangible assets (2)			194
	Net tangible assets (liabilities) (3)			(7	)
	Deferred tax liabilities, net			(40	)
	Total purchase price consideration (4)		$	400
	-1	Goodwill in the amount of $5 million is expected to be deductible for tax purposes.
	-2	Identifiable definite-lived intangible assets acquired during 2014 were comprised of trade names of $44 million with a weighted average life of 10.0 years, customer lists and supplier relationships of $82 million with a weighted average life of 7.2 years, subscriber relationships of $25 million with a weighted average life of 6.0 years and developed technology and other of $43 million with a weighted average life of 4.9 years. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2014 was 7.2 years, and will be amortized on a straight-line basis over their estimated useful lives from acquisition date.
	-3	Includes assets acquired, including cash of $62 million and accounts receivable of $25 million and liabilities assumed, including deferred merchant payables of $76 million, accrued expenses and other current liabilities of $15 million and deferred revenue of $5 million which reflect their respective fair values at acquisition date.
	-4	Subject to adjustment based on (i) final working capital adjustment calculations to be determined for Restopolis and Iens, and (ii) indemnification obligations for general representations and warranties of the acquired company stockholders.
	2013 Acquisitions
	During the year ended December 31, 2013, we completed six acquisitions for a total purchase price consideration of $40 million, for which the Company paid total cash consideration of $35 million, net of cash acquired of $3 million and approximately $2 million in holdbacks for general representations and warranties of the respective sellers, of which $1 million was paid in 2014. The cash consideration was paid primarily from our international subsidiaries.  We acquired TinyPost, the developer of a product that enables users to write over photos and turn them into stories, Jetsetter, a members-only private sale site for hotel bookings; CruiseWise, a cruise research and planning site; Niumba, a Spain-based vacation rental site; GateGuru, a mobile app with flight and airport information around the world; Oyster, a hotel review website featuring expert reviews and photos around the world, all of which complemented our existing brands in those areas of the travel ecosystem. The purchase price allocation for our 2013 acquisitions is considered final at December 31, 2014.
	The following table presents the purchase price allocation recorded on our consolidated balance sheet at fair value for all 2013 acquisitions (in millions):
			Total
	Goodwill (1)		$	30
	Intangible assets (2)			19
	Net liabilities assumed (3)			(10	)
	Deferred tax assets			1
	Total purchase price consideration (4)		$	40
	-1	Goodwill in the amount of $14 million is expected to be deductible for tax purposes.
	-2	Identifiable definite-lived intangible assets acquired during 2013 were comprised of trade names of $8 million, subscriber relationships of $8 million, and developed technology and other of $3 million. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2013 was 8.0 years, which is being amortized on a straight-line basis over their estimated useful lives from acquisition date.
	-3	Includes assets acquired, including cash of $3 million and accounts receivable of $2 million and liabilities assumed, including accounts payables of $11 million, accrued expenses and other current liabilities of $1 million and deferred revenue of $3 million which reflected their respective fair values at acquisition date.
	-4	Subject to adjustment based on (i) indemnification obligations for general representations and warranties of the acquired company stockholders.
	2012 Acquisitions
	We purchased a travel media company for approximately $3 million. The purchase price consideration was primarily allocated to goodwill, which is not tax deductible. The purchase price and purchase price allocation is final for this acquisition at December 31, 2014.
	We also paid $22 million for the remaining noncontrolling interest subsidiary shares related to a 2008 acquisition, which brought our ownership to 100%. This amount is included in financing activities in our consolidated statement of cash flows for the year ended December 31, 2012.

Stock_Based_Awards_and_Other_E

Stock Based Awards and Other Equity Instruments	12 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Awards and Other Equity Instruments	NOTE 4: STOCK BASED AWARDS AND OTHER EQUITY INSTRUMENTS
	Stock-based Compensation Expense
	The following table presents the amount of stock-based compensation related to stock-based awards, primarily stock options and RSUs, on our consolidated statements of operations during the periods presented:
			Year ended December 31,
			2014			2013			2012
			(in millions)
	Selling and marketing		$	13		$	11		$	5
	Technology and content			27			21			11
	General and administrative			23			17			14
	Total stock-based compensation			63			49			30
	Income tax benefit from stock-based compensation			(24	)		(18	)		(10	)
	Total stock-based compensation, net of tax effect		$	39		$	31		$	20
	During the years ended December 31, 2014 and 2013, we capitalized $8 million and $5 million, respectively, of stock-based compensation as website development costs.  This amount was immaterial for the year ended December 31, 2012.
	Stock and Incentive Plan
	On December 20, 2011, our 2011 Stock and Annual Incentive Plan became effective and we filed Post-Effective Amendment No. 1 on Form S-8 to Registration Statement on Form S-4 (File No. 333-178637) (the “Prior Registration Statement”) with the Securities and Exchange Commission (the “Commission”), registering a total of 17,500,000 shares of our common stock, of which 17,400,000 shares were issuable in connection with grants of equity-based awards under our 2011 Incentive Plan (7,400,000 of which shares were originally registered on the Form S-4 and 10,000,000 of which shares were first registered on the Prior Registration Statement) and 100,000 shares were issuable under our Deferred Compensation Plan for Non-Employee Directors (refer to “Note 13— Employee Benefit Plans” below for information on our Deferred Compensation Plan for Non-Employee Directors).
	At our annual meeting of stockholders held on June 28, 2013 (the “Annual Meeting”), our stockholders approved an amendment to our 2011 Stock and Annual Incentive Plan to, among other things, increase the aggregate number of shares of common stock authorized for issuance thereunder by 15,000,000 shares. We refer to our 2011 Stock and Annual Incentive Plan, as amended by the amendment as the “2011 Incentive Plan.” A summary of the material terms of the 2011 Incentive Plan can be found in “Proposal 3: Approval of the 2011 Stock and Annual Incentive Plan, as amended” in our Proxy Statement for the Annual Meeting.
	On September 12, 2014, we filed a Registration Statement on Form S-8 with respect to up to 100,595 shares of our common stock for issuance under the Viator, Inc. 2010 Stock Incentive Plan, as amended (the “Viator Plan”).  Pursuant to the Amended and Restated Agreement and Plan of Merger among TripAdvisor LLC; Vineyard Acquisition Corporation and Viator, Inc., dated as of July 24, 2014 (the “Merger Agreement”), Vineyard Acquisition Corporation merged with and into Viator, Inc. with Viator, Inc. surviving as a wholly-owned subsidiary of the Company. In accordance with the Merger Agreement, we assumed certain outstanding options to purchase shares of common stock of Viator granted under the Viator Plan (the “Assumed Options”). As a result of this assumption, the Assumed Options were converted into options to purchase shares of our common stock. We do not intend to grant new equity or equity-based awards under the Viator Plan.
	Pursuant to the 2011 Annual Incentive Plan, we may, among other things, grant RSUs, restricted stock, stock options and other stock-based awards to our directors, officers, employees and consultants. The summary of the material terms of the 2011 Incentive Plan is qualified in its entirety by the full text of the 2011 Incentive Plan previously filed.
	As of December 31, 2014, the total number of shares available for issuance under the 2011 Incentive Plan is 17,691,977 shares. All shares of common stock issued in respect of the exercise of options or other equity awards since Spin-Off have been issued from authorized, but unissued common stock.
	Stock Based Award Activity and Valuation
	2014 Stock Option Activity
	During the year ended December 31, 2014, we have issued 679,568 of primarily service based non-qualified stock options primarily from the 2011 Incentive Plan. These stock options generally have a term of ten years from the date of grant and generally vest equitably over a four-year requisite service period.
	A summary of our stock option activity is presented below:
						Weighted			Weighted
						Average			Average
						Exercise			Remaining			Aggregate
			Options			Price Per			Contractual			Intrinsic
			Outstanding			Share			Life			Value
			(in thousands)						(in years)			(in millions)
	Options outstanding at December 31, 2013			9,470			40.18
	Assumed options from acquisition			101			16.36
	Granted			579			95.87
	Exercised (1)			(1,202	)		32.87
	Cancelled or expired			(297	)		45.4
	Options outstanding at December 31, 2014			8,651		$	44.47			5		$	273
	Exercisable as of December 31, 2014			4,080		$	32.05			2.7		$	174
	Vested and expected to vest after December 31, 2014			8,445		$	44.11			4.9		$	269
	-1	Inclusive of 628,010 options, which were not converted into shares due to net share settlement in order to cover the aggregate exercise price and the minimum amount of required employee withholding taxes. Potential shares which had been convertible under stock options that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Incentive Plan and can be reissued by the Company. We began net-share settling the majority of our stock option exercises during the third quarter of 2013. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.
	Aggregate intrinsic value represents the difference between the closing stock price of our common stock and the exercise price of outstanding, in-the-money options. Our closing stock price as reported on NASDAQ as of December 31, 2014 was $74.66. The total intrinsic value of stock options exercised for the years ended December 31, 2014, 2013, and 2012 were $75 million, $58 million, and $25 million, respectively.
	The fair value of stock option grants under the 2011 Plan and Viator Plan has been estimated at the date of grant using the Black–Scholes option pricing model with the following weighted average assumptions for the periods presented:
			December 31,
			2014			2013			2012
	Risk free interest rate			1.79	%		1.41	%		1.03	%
	Expected term (in years)			5.8			6.06			6.21
	Expected volatility			44.04	%		50.78	%		53.46	%
	Expected dividend yield		—  %			—  %			—  %
	The weighted-average grant date fair value of options granted, excluding assumed acquisition-related options, was $46.65, $28.30, and $20.36 for the years ended December 31, 2014, 2013 and 2012, respectively. The weighted-average grant date fair value of assumed acquisition-related options was $80.31 for the year ended December 31, 2014.  There were no assumed acquisition-related options granted for the years ended December 31, 2013 and 2012.  The total fair value of stock options vested for the years ended December 31, 2014, 2013, and 2012 were $34 million, $27 million, and $10 million, respectively.
	2014 RSU Activity
	During the year ended December 31, 2014, we issued 752,460 RSUs under the 2011 Incentive Plan for which the fair value was measured based on the quoted price of our common stock on the date of grant. These RSUs generally vest over a four-year requisite service period.
	The following table presents a summary of our RSU activity:
						Weighted
						Average
						Grant-			Aggregate
			RSUs			Date Fair			Intrinsic
			Outstanding			Value Per Share			Value
			(in thousands)						(in millions)
	Unvested RSUs outstanding as of December 31, 2013			1,135			49.64
	Granted			752			93.36
	Vested and released (1)			(307	)		46.78
	Cancelled			(132	)		67.5
	Unvested RSUs outstanding as of December 31, 2014			1,448		$	71.33		$	108
	-1	Inclusive of 103,641 RSUs withheld to satisfy employee minimum tax withholding requirements due to net share settlement. Potential shares which had been convertible under RSUs that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Plan and can be reissued by the Company. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.
	Other Equity Activity
	Upon Spin-Off, we entered into a warrant agreement (the “Warrant Agreement”) with Mellon Investor Services LLC and issued warrants exercisable for TripAdvisor common stock in respect of previously outstanding warrants exercisable for Expedia common stock that were adjusted on account of Expedia’s reverse stock split and the Spin-Off. In total, at Spin-Off, the warrants could have been converted into a maximum of 8,046,698 shares of our common stock without any further adjustments to the Warrant Agreement and had an expiration date of May 7, 2012.
One tranche of warrants (issued in respect of Expedia warrants that had featured an exercise price of $12.23 per warrant prior to adjustment) were exercisable for 0.25 (one-quarter) of a share of TripAdvisor common stock at an exercise price equal to $6.48 per warrant, and the other tranche of warrants (issued in respect of Expedia warrants that had featured an exercise price of $14.45 per warrant prior to adjustment) were exercisable for 0.25 (one-quarter) of a share of TripAdvisor common stock at an exercise price equal to $7.66 per warrant. The exercise price could have been paid in cash or via “cashless exercise” as set forth in the Warrant Agreement.
During the year ended December 31, 2012, and prior to the expiration date, there were a total of 32,186,791 warrants exercised which resulted in a total of 7,952,456 shares of our common stock being issued during that period, which included 31,641,337 warrants for which the exercise price was paid in cash at a weighted average price of $27.11. We received total exercise proceeds of $215 million related to these warrant exercises, which is reflected as a financing activity within the consolidated statement of cash flows. In addition there were 545,454 cashless warrants exercised with a weighted average exercise price of $25.92 of which we did not receive any exercise proceeds. We currently have no outstanding warrants remaining which could be convertible to shares of our common stock.
Unrecognized Stock-Based Compensation
A summary of our remaining unrecognized compensation expense, net of estimated forfeitures, and the weighted average remaining amortization period at December 31, 2014 related to our non-vested stock options and RSU awards is presented below (in millions, except per year information):
		Stock
		Options			RSUs
Unrecognized compensation expense (net of forfeitures)		$	84		$	70
Weighted average period remaining (in years)			2.7			2.9

Financial_Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2014
Investments All Other Investments [Abstract]
Financial Instruments	NOTE 5: FINANCIAL INSTRUMENTS
	Cash, Cash Equivalents and Marketable Securities
	The following tables show our cash and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short and long-term marketable securities as of December 31, 2014 and December 31, 2013 (in millions):
			31-Dec-14
											Cash and		Short-Term		Long-Term
			Amortized		Unrealized		Unrealized		Fair		Cash		Marketable		Marketable
			Cost		Gains		Losses		Value		Equivalents		Securities		Securities
	Cash		$	447	$	—	$	—	$	447	$	447	$	—	$	—
	Level 1:
	Money market funds			8		—		—		8		8		—		—
	Level 2:
	U.S. agency securities			38		—		—		38		—		35		3
	Certificates of deposit			8		—		—		8		—		8		—
	Commercial paper			1		—		—		1		—		1		—
	Corporate debt securities			92		—		—		92		—		64		28
	Subtotal			139		—		—		139		—		108		31
	Total		$	594	$	—	$	—	$	594	$	455	$	108	$	31
			31-Dec-13
											Cash and		Short-Term		Long-Term
			Amortized		Unrealized		Unrealized		Fair		Cash		Marketable		Marketable
			Cost		Gains		Losses		Value		Equivalents		Securities		Securities
	Cash		$	195	$	—	$	—	$	195	$	195	$	—	$	—
	Level 1:
	Money market funds			156		—		—		156		156		—		—
	Level 2:
	U.S. agency securities			37		—		—		37		—		14		23
	Certificates of deposit			23		—		—		23		—		16		7
	Commercial paper			5		—		—		5		—		5		—
	Corporate debt securities			254		—		—		254		—		96		158
	Subtotal			319		—		—		319		—		131		188
	Total		$	670	$	—	$	—	$	670	$	351	$	131	$	188
	Our cash and cash equivalents consist of cash on hand in global financial institutions, money market funds and marketable securities, with maturities of 90 days or less at the date purchased. The remaining maturities of our long-term marketable securities range from one to three years and our short-term marketable securities include maturities that were greater than 90 days at the date purchased and have 12 months or less remaining at December 31, 2014 and 2013, respectively.
	We classify our cash equivalents and marketable securities within Level 1 and Level 2 as we value our cash equivalents and marketable securities using quoted market prices (Level 1) or alternative pricing sources (Level 2). The valuation technique we used to measure the fair value of money market funds were derived from quoted prices in active markets for identical assets or liabilities. Fair values for Level 2 investments are considered “Level 2” valuations because they are obtained from independent pricing sources for identical or comparable instruments, rather than direct observations of quoted prices in active markets. Our procedures include controls to ensure that appropriate fair values are recorded, including comparing the fair values obtained from our independent pricing services against fair values obtained from another independent source.
	There were no material realized gains or losses related to sales of our marketable securities for the years ended December 31, 2014, 2013 and 2012.
	As of December 31, 2014, we have marketable securities with a total fair value of $68 million currently in an unrealized loss position. The gross unrealized loss amount was not material at December 31, 2014.  We consider the declines in market value of our marketable securities investment portfolio to be temporary in nature and do not consider any of our investments other-than-temporarily impaired. During the years ended December 31, 2014, 2013 and 2012, we did not recognize any impairment charges. We also did not have any material investments in marketable securities that were in a continuous unrealized loss position for 12 months or greater at December 31, 2014 or 2013.
	Derivative Financial Instruments
	Our current forward contracts are not designated as hedges and have current maturities of less than 90 days. Consequently, any gain or loss resulting from the change in fair value was recognized in our consolidated statement of operations.  All gains and losses recorded to other, net on the consolidated statement of operations for the years ended December 31, 2014, 2013, and 2012 were not material.
	The following table shows the notional principal amounts of our outstanding derivative instruments that are not designated as hedging instruments for the periods presented:
			December 31,		December 31,
			2014		2013
			(in millions)
	Foreign exchange-forward contracts (1)(2)		$	20	$	5
	-1	Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. Dollar.
	-2	The fair value of our derivatives are not material for all periods presented and are reported as liabilities in accrued and other current liabilities on our consolidated balance sheets. We measure the fair value of our outstanding or unsettled derivatives using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.
	Concentration of Credit Risk
	Counterparties to currency exchange derivatives consist of major international financial institutions. We monitor our positions and the credit ratings of the counterparties involved and, by policy limits, the amount of credit exposure to any one party. While we may be exposed to potential losses due to the credit risk of non-performance by these counterparties, losses are not anticipated and any credit risk amounts associated with our outstanding or unsettled derivative instruments are deemed to be not material for any period presented.
	Other Financial Instruments
	Other financial instruments not measured at fair value on a recurring basis include trade receivables, trade payables, deferred merchant payables, short-term debt, accrued and other current liabilities and long-term debt. With the exception of long-term debt, the carrying amount approximates fair value because of the short maturity of these instruments as reported on the consolidated balance sheets as of December 31, 2014 and December 31, 2013. The carrying value of the long-term borrowings outstanding on our Credit Agreement bears interest at a variable rate and therefore is also considered to approximate fair value.
	We did not have any Level 3 assets or liabilities at December 31, 2014 or 2013.

Property_and_Equipment_Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Property and Equipment, Net	NOTE 6: PROPERTY AND EQUIPMENT, NET
	Property and equipment consists of the following for the periods presented:
			December 31,			December 31,
			2014			2013
			(in millions)
	Capitalized software and website development		$	104		$	73
	Leasehold improvements			40			22
	Computer equipment			31			21
	Furniture, office equipment and other			11			6
				186			122
	Less: accumulated depreciation			(77	)		(48	)
	Construction in progress (1)			86			8
	Property and equipment, net		$	195		$	82
	-1	We capitalize construction in progress for build-to-suit lease agreements where we are considered the owner, for accounting purposes only, during the construction period.  These amounts represent construction costs to date incurred by the landlord and the Company related to our future corporate headquarters in Needham, MA. During the years ended December 31, 2014 and 2013, we capitalized $52 million and $8 million, respectively, in non-cash construction costs which were incurred by the landlord, with a corresponding liability recorded in other long-term liabilities, and in addition, we capitalized $26 million in normal and structural tenant improvements on our consolidated balance sheet incurred by the Company. Refer to “Note 12 – Commitments and Contingencies,” for additional information on our future corporate headquarters lease.
	As of December 31, 2014 and 2013, our recorded capitalized software and website development costs, net of accumulated amortization, were $61 million and $46 million, respectively. For the years ended December 31, 2014 and 2013, we capitalized $47 million and $38 million, respectively, related to software and website development costs. For the years ended December 31, 2014, 2013 and 2012, we recorded amortization of capitalized software and website development costs of $30 million, $20 million and $13 million, respectively, which is included in depreciation expense on our consolidated statements of operations for those years.
	During the year ended December 31, 2014, we retired and disposed of property and equipment, primarily capitalized software and website development, which were no longer in use with a total cost of $22 million and associated accumulated depreciation of $20 million, resulting in a loss of $2 million included in operating income on our consolidated statements of operations.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets, Net	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	NOTE 7: GOODWILL AND INTANGIBLE ASSETS, NET
	The following table summarizes our goodwill activity by segment for the periods presented:
			TripAdvisor			Hotel			Other			Consolidated
			(in millions)
	Balance as of December 31, 2012		$	472		$	-		$	-		$	472
	Additions (1)			30			-			-			30
	Balance as of December 31, 2013		$	502		$	-		$	-		$	502
	Additions (1)			253			-			-			253
	Other adjustments (2)			(21	)		-			-			(21	)
	Allocation to new segments (3)			(734	)		442			292			-
	Ending balance as of December 31, 2014		$	-		$	442		$	292		$	734
	-1	The additions to goodwill relate to our business acquisitions. See “Note 3— Acquisitions,” for further information.
	-2	Primarily related to impact of changes in foreign exchange rates to goodwill.
	-3	See “Note 16—Segments and Geographic Information” for information on our reporting segment changes in the fourth quarter of 2014.
	Intangible assets, which were acquired in business combinations and recorded at fair value on the date of purchase, consist of the following for the periods presented:
			December 31,
				2014			2013
			(in millions)
	Intangible assets with definite lives		$	202		$	36
	Less: accumulated amortization			(18	)		(14	)
	Intangible assets with definite lives, net			184			22
	Intangible assets with indefinite lives			30			30
			$	214		$	52
	Amortization expense was $18 million, $6 million, and $6 million, respectively, for the years ended December 31, 2014, 2013 and 2012.
	Our indefinite-lived assets relate to trade names and trademarks. Refer to “Note 2— Significant Accounting Policies” above for a discussion of our annual indefinite-lived intangible asset impairment assessment.
	The following table presents the components of our intangible assets with definite lives for the periods presented:
						December 31, 2014									December 31, 2013
			Weighted Average			Gross						Net			Gross					Net
			Remaining Life			Carrying			Accumulated			Carrying			Carrying		Accumulated			Carrying
			(in years)			Amount			Amortization			Amount			Amount		Amortization			Amount
						(in millions)									(in millions)
	Trade names and trademarks			9.4		$	52		$	(5	)	$	47		$	18	$	(7	)	$	11
	Customer lists and supplier relationships			6.8			77			(5	)		72			-		-			-
	Subscriber relationships			5.5			31			(4	)		27			14		(6	)		8
	Technology and other			4.5			42			(4	)		38			4		(1	)		3
	Total			6.8		$	202		$	(18	)	$	184		$	36	$	(14	)	$	22
	Refer to “Note 3— Acquisitions” above for a discussion of definite lived intangible assets acquired in business combinations during the years ended December 31, 2014 and 2013.
	Intangible assets with definite lives are amortized on a straight-line basis. The estimated amortization expense for intangible assets with definite lives for each of the next five years, and the expense thereafter, assuming no subsequent impairment of the underlying assets, is expected to be as follows (in millions):
	2015		$	31
	2016			31
	2017			29
	2018			27
	2019			24
	2020 and thereafter			42
	Total		$	184

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	NOTE 8: DEBT
	Term Loan Facility Due 2016 and Revolving Credit Facility
	Overview
	On December 20, 2011, we entered into a credit agreement, by and among TripAdvisor, TripAdvisor Holdings, LLC, and TripAdvisor LLC, the lenders party thereto, JPMorgan Chase Bank, N.A., as administrative agent, and J.P. Morgan Europe Limited, as London agent (this credit agreement, together with all exhibits, schedules, annexes, certificates, assignments and related documents contemplated thereby, is referred to herein as the “Credit Agreement”), which provides $600 million of borrowing including:
	·	the Term Loan Facility, or Term Loan, in an aggregate principal amount of $400 million with a term of five years due December 2016; and
	·	the Revolving Credit Facility in an aggregate principal amount of $200 million available in U.S. dollars, Euros and British pound sterling with a term of five years expiring December 2016.
	The Term Loan and any loans under the Revolving Credit Facility bear interest by reference to a base rate or a Eurocurrency rate, in either case plus an applicable margin based on our leverage ratio. We are also required to pay a quarterly commitment fee, on the average daily unused portion of the Revolving Credit Facility for each fiscal quarter and fees in connection with the issuance of letters of credit. The Term Loan and loans under the Revolving Credit Facility currently bear interest at LIBOR plus 150 basis points, or the Eurocurrency Spread, or the alternate base rate (“ABR”) plus 50 basis points, and undrawn amounts are currently subject to a commitment fee of 22.5 basis points. As of December 31, 2014 and 2013, we were using a one-month interest period Eurocurrency Spread which is approximately 1.7% per annum. Interest is currently payable on a monthly basis while we are borrowing under the one-month interest rate period. The current interest rates are based on current assumptions, leverage and LIBOR rates and do not take into account that rates will reset periodically.
	The Term Loan principal is currently repayable in quarterly installments on the last day of each calendar quarter equal to 2.5% of the original principal amount with the balance due on the final maturity date. Principal payments aggregating $40 million were made during the year ended December 31, 2014.
	The Revolving Credit Facility includes $40 million of borrowing capacity available for letters of credit and $40 million for borrowings on same-day notice. As of December 31, 2014 there are no outstanding borrowings under our Revolving Credit Facility.  As of December 31, 2014 there were $1 million of outstanding letters of credit against the Revolving Credit Facility.
	During the years ended December 31, 2014, 2013 and 2012, we recorded total interest and commitment fees on our Credit Agreement of $6 million, $8 million and $9 million, respectively, to interest expense on our consolidated statements of operations. All unpaid interest and commitment fee amounts as of December 31, 2014 and 2013 were not material.
	In connection with the Credit Agreement, we also incurred debt financing costs totaling $3.5 million, which were initially capitalized as deferred financing costs. During the years ended December 31, 2014, 2013 and 2012, we recorded amortization expense of $1 million, respectively, to interest expense on our consolidated statements of operations. These costs will continue to be amortized over the remaining term of the Term Loan using the effective interest rate method.
	Total outstanding borrowings under the Credit Agreement consist of the following:
			December 31,		December 31,
			2014		2013
			(in millions)
	Short-Term Debt:
	Term Loan		$	40	$	40
	Total Short-Term Borrowings		$	40	$	40
	Long-Term Debt:
	Term Loan		$	260	$	300
	Total Long-Term Borrowings		$	260	$	300
	The future minimum principal payment obligations due under the Credit Agreement related to our Term Loan is as follows:
			Principal Payments
	December 31,		(in millions)
	2015		$	40
	2016			260
	Total		$	300
	Prepayments
	We may voluntarily repay any outstanding borrowing under the Credit Agreement at any time without premium or penalty, other than customary breakage costs with respect to Eurocurrency loans.
	Guarantees
	All obligations under the Credit Agreement are unconditionally guaranteed by us and each of our existing and subsequently acquired or organized direct or indirect wholly-owned domestic and foreign restricted subsidiaries, subject to certain exceptions for subsidiaries that are controlled foreign corporations, foreign subsidiaries in jurisdictions where applicable law would otherwise be violated, and non-material subsidiaries.
	Covenants
	The Credit Agreement contains a number of covenants that, among other things, restrict our ability to: incur additional indebtedness, create liens, enter into sale and leaseback transactions, engage in mergers or consolidations, sell or transfer assets, pay dividends and distributions, make investments, loans or advances, prepay certain subordinated indebtedness, make certain acquisitions, engage in certain transactions with affiliates, amend material agreements governing certain subordinated indebtedness, and change our fiscal year. The Credit Agreement also requires us to maintain a maximum leverage ratio and a minimum cash interest coverage ratio, and contains certain customary affirmative covenants and events of default, including a change of control. If an event of default occurs, the lenders under the Credit Agreement will be entitled to take various actions, including the acceleration of all amounts due under Credit Agreement and all actions permitted to be taken by a secured creditor.
	As of December 31, 2014 we are in compliance with all of our debt covenants.
	Chinese Credit Facilities
	In addition to our borrowings under the Credit Agreement, we maintain our Chinese Credit Facilities. As of December 31, 2014 and 2013, we had short-term borrowings outstanding of $38 million and $28 million, respectively.
	Certain of our Chinese subsidiaries are entered into a RMB 189,000,000 (approximately $30 million), one-year revolving credit facility with Bank of America (the “Chinese Credit Facility—BOA”) that is currently subject to review on a periodic basis with no-specific expiration period. We had $19 million of outstanding borrowings from the Chinese Credit Facility—BOA as of December 31, 2014. Our Chinese Credit Facility—BOA currently bears interest at a 100% of the People’s Bank of China’s base rate which was 5.6% as of December 31, 2014.
	In addition, certain of our Chinese subsidiaries are entered into a RMB 125,000,000 (approximately $20 million) one-year revolving credit facility with J.P. Morgan Chase Bank (“Chinese Credit Facility-JPM”). We had $19 million of outstanding borrowings from the Chinese Credit Facility—JPM as of December 31, 2014. Our Chinese Credit Facility—JPM currently bears interest at a 100% of the People’s Bank of China’s base rate which was 5.6% as of December 31, 2014.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 9: INCOME TAXES
	The following table presents a summary of our domestic and foreign income before income taxes:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Domestic	$	146		$	129		$	133
	Foreign		176			155			149
	Total	$	322		$	284		$	282
	The following table presents a summary of the components of our provision for income taxes:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Current income tax expense:
	Federal	$	93		$	48		$	56
	State		14			9			6
	Foreign		6			17			30
	Current income tax expense		113			74			92
	Deferred income tax (benefit) expense:
	Federal		(12	)		6			(3	)
	State		(1	)		1			—
	Foreign		(4	)		(2	)		(2	)
	Deferred income tax (benefit) expense:		(17	)		5			(5	)
	Provision for income taxes	$	96		$	79		$	87
	As of December 31, 2014, our current income tax receivable and income tax payable balances represent amounts that we will receive and pay, respectively, to the Internal Revenue Service and other tax authorities.
	Our deferred tax assets and deferred tax liabilities as of December 31, 2014 and 2013 are as follows:
		December 31,
		2014			2013
		(in millions)
	Deferred tax assets:
	Stock-based compensation	$	43		$	30
	Net operating loss carryforwards		34			18
	Provision for accrued expenses		13			7
	Deferred rent		5			—
	Build-to-suit lease		26			—
	Foreign advertising spend		9			—
	Other		5			4
	Total deferred tax assets	$	135		$	59
	Less: valuation allowance		(19	)		(13	)
	Net deferred tax assets	$	116		$	46
	Deferred tax liabilities:
	Intangible assets	$	(88	)	$	(32	)
	Property and equipment		(25	)		(18	)
	Prepaid expenses		(4	)		(2	)
	Lease financing obligation		(26	)		—
	Other		(1	)		(2	)
	Total deferred tax liabilities	$	(144	)	$	(54	)
	Net deferred tax liability	$	(28	)	$	(8	)
	At December 31, 2014, we had federal, state and foreign net operating loss carryforwards (“NOLs”) of approximately $42 million, $36 million and $84 million. If not utilized, the federal and state NOLs will expire at various times between 2020 and 2034 and the foreign NOLs will expire at various times between 2015 and 2034.
	At December 31, 2014, we had a valuation allowance of $19 million primarily related to foreign net operating loss carryforwards for which it is more likely than not that the tax benefit will not be realized. This amount represented an overall increase of $6 million over the amount recorded as of December 31, 2013. The increase is primarily due to additional foreign advertising spend, offset by expiring foreign net operating losses.  Except for certain deferred tax assets, we expect to realize all of our deferred tax assets based on a strong history of earnings in the US and other jurisdictions, as well as future reversals of taxable temporary differences.
	We have not provided for deferred U.S. income taxes on undistributed earnings of our foreign subsidiaries that we intend to reinvest permanently outside the United States; the total amount of such earnings as of December 31, 2014 was $630 million. Should we distribute or be treated under certain U.S. tax rules as having distributed earnings of foreign subsidiaries in the form of dividends or otherwise, we may be subject to U.S. income taxes. Due to complexities in tax laws and various assumptions that would have to be made, it is not practicable at this time to estimate the amount of unrecognized deferred U.S. taxes on these earnings.
	A reconciliation of the provision for income taxes to the amounts computed by applying the statutory federal income tax rate to income before income taxes is as follows:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Income tax expense at the federal statutory rate of 35%	$	113		$	100		$	99
	Foreign rate differential		(49	)		(41	)		(25	)
	State income taxes, net of effect of federal tax benefit		13			8			5
	Unrecognized tax benefits and related interest		14			9			5
	Non-deductible transaction costs		1			—			—
	Change in valuation allowance		5			2			2
	Other, net		(1	)		1			1
	Provision for income taxes	$	96		$	79		$	87
	During 2011, the Singapore Economic Development Board accepted our application to receive a tax incentive under the International Headquarters Award. This incentive provides for a reduced tax rate on qualifying income of 5% as compared to Singapore’s statutory tax rate of 17% and is conditional upon our meeting certain employment and investment thresholds. This agreement is set to expire on June 30, 2016, with the ability to extend for another five years. This benefit resulted in a decrease to the 2014 tax provision of $6 million or an incremental $0.04 to Diluted EPS for 2014.
	By virtue of previously filed consolidated income tax returns filed with Expedia, we are currently under an IRS audit for the 2009 and 2010 tax years, and have various ongoing state income tax audits.  We are separately under audit for the 2012 tax year. As of December 31, 2014, no material assessments have resulted from these audits. These audits include questioning of the timing and the amount of income and deductions and the allocation of income among various tax jurisdictions. Annual tax provisions include amounts considered sufficient to pay assessments that may result from the examination of prior year returns. We are no longer subject to tax examinations by tax authorities for years prior to 2007.
A reconciliation of the beginning and ending amount of gross unrecognized tax benefits (excluding interest and penalties) is as follows:
	December 31,
	2014			2013			2012
	(in millions)
Balance, beginning of year	$	36		$	24		$	13
Increases to tax positions related to the current year		13			12			12
Increases to tax positions related to the prior year		18			4			—
Reductions due to lapsed statute of limitations		—			—			—
Decreases to tax positions related to the prior year		—			(4	)		—
Settlements during current year		—			—			(1	)
Balance, end of year	$	67		$	36		$	24
As of December 31, 2014, we had $67 million of unrecognized tax benefits, net of interest, which is classified as long-term and included in other long-term liabilities. Of this amount, approximately $65 million would affect the effective tax rate if recognized, while $2 million would affect goodwill.  We recognize interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2014 and 2013, total gross interest accrued was $4 million and $2 million, respectively. We estimate that approximately $1 million will be paid within the next year related to audits.

Accrued_Expenses_and_Other_Cur

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2014
Payables And Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	NOTE 10: ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
	Accrued expenses and other current liabilities consisted of the following for the periods presented:
			December 31,		December 31,
			2014		2013
			(in millions)
	Accrued salary, bonus, and related benefits		$	41	$	35
	Accrued marketing costs			24		22
	Accrued charitable foundation payments (1)			9		7
	Other			40		22
	Total accrued expenses and other current liabilities		$	114	$	86
	-1	See “Note 12— Commitments and Contingencies” for information regarding our charitable foundation.

Other_LongTerm_Liabilities

Other Long-Term Liabilities	12 Months Ended
	Dec. 31, 2014
Other Liabilities Noncurrent [Abstract]
Other Long-Term Liabilities	NOTE 11: OTHER LONG-TERM LIABILITIES
	Other long-term liabilities consisted of the following for the periods presented:
			December 31,		December 31,
			2014		2013
			(in millions)
	Unrecognized tax benefits (1)		$	68	$	38
	Construction liabilities (2)			67		8
	Other (3)			19		6
	Total other long-term liabilities		$	154	$	52
	-1	See “Note 9—Income Taxes” for additional information on our unrecognized tax benefits. Amount includes accrued interest related to this liability.
	-2	We capitalize construction in progress and record a corresponding long-term liability for build-to-suit lease agreements where we are considered the owner during the construction period for accounting purposes only.  Refer to “Note 12 – Commitments and Contingencies,” for additional information on our future corporate headquarters lease.
	-3	Amounts primarily consist of long term deferred rent balances related to operating leases for office space.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 12: COMMITMENTS AND CONTINGENCIES
	We have material commitments and obligations that include office space leases and expected interest on long-term debt, which are not accrued on the consolidated balance sheet at December 31, 2014 but we expect to require future cash outflows.
	Office Lease Commitments
	We have contractual obligations in the form of operating leases for office space for which we record the related expense on a monthly basis. Certain leases contain periodic rent escalation adjustments and renewal options. Rent expense related to such leases is recorded on a straight-line basis. Operating lease obligations expire at various dates with the latest maturity in December 2030. For the years ended December 31, 2014, 2013 and 2012, we recorded rental expense of $17 million, $11 million and $8 million, respectively.
	We currently lease approximately 119,000 square feet for our corporate headquarters in Newton, Massachusetts, pursuant to a lease with an expiration date of April 2015.  We are in the process of negotiating an extension of this lease until mid-2015.
	Transition to New Corporate Headquarters
	In June 2013, TripAdvisor LLC (“TA LLC”), our indirect, wholly owned subsidiary, entered into a lease (the “Lease”), for a new corporate headquarters. Pursuant to the Lease, the landlord will build an approximately 280,000 square foot rental building in Needham, Massachusetts (the “Premises”), and thereafter lease the Premises to TA LLC as TripAdvisor’s new corporate headquarters for an initial term of 15 years and 7 months. If the landlord fails to deliver the Premises according to the schedule, subject to certain conditions, TA LLC may be entitled to additional free rent, or in extreme cases, a right to terminate the Lease. Under the Lease, TA LLC is required to pay an initial base rent of $33.00 per square foot per year, increasing to $34.50 per square foot by the final year of the initial term, as well as all real estate taxes and other building operating costs. TA LLC also has an option to extend the term of the Lease for two consecutive terms of five years each.
	The aggregate future minimum lease payments are $143 million and are currently scheduled to be paid, beginning in November 2015, as follows: $1 million for 2015, $9 million for 2016, $9 million for 2017, $9 million for 2018, $9 million for 2019 and $106 million for 2020 and thereafter. The Lease has escalating rental payments and initial periods of free rent. TA LLC was also obligated to deliver a letter of credit to the Landlord in the amount of $1 million as security deposit, which amount is subject to increase under certain circumstances. TA LLC also has an option to extend the term of the Lease for two consecutive terms of five years each. Subject to certain conditions, TA LLC has certain rights under the Lease, including rights of first offer to lease additional space or to purchase the Premises if the Landlord elects to sell. In connection with the Lease, TripAdvisor entered into a Guaranty (the “Guaranty”), pursuant to which TripAdvisor provides full payment and performance guaranty for all of TA LLC’s obligations under the Lease.
	We have concluded we are the deemed owner (for accounting purposes only) of the Premises during the construction period under build to suit lease accounting. Building construction began in the fourth quarter of 2013.  Since construction began, we have recorded estimated project construction costs incurred by the landlord as a construction in progress asset and a corresponding long term liability in “Property and equipment, net” and “Other long-term liabilities,” respectively, on our consolidated balance sheets. We will continue to increase the asset and corresponding long term liability as additional building costs are incurred by the landlord during the construction period.  In addition, the amounts that the Company has paid or incurred for normal tenant improvements and structural improvements have also been recorded to the construction-in-progress asset.
	Once the landlord completes the construction of the Premises (estimated to be mid 2015), we will evaluate the Lease in order to determine whether or not the Lease meets the criteria for “sale-leaseback” treatment under GAAP. If the Lease meets the “sale-leaseback” criteria, we will remove the asset and the related liability from our consolidated balance sheet and treat the Lease as either an operating or capital lease based on the our assessment of the accounting guidance.  However, we currently expect that upon completion of construction of the Premises that the Lease will not meet the "sale-leaseback" criteria.
	If the Lease does not meet “sale-leaseback” criteria, we will treat the Lease as a financing obligation and lease payments will be attributed to (1) a reduction of the principal financing obligation; (2) imputed interest expense; and (3) land lease expense (which is considered an operating lease) representing an imputed cost to lease the underlying land of the facility. In addition, the underlying building asset will be depreciated over the initial term of the lease. And at the conclusion of the lease term, we would de-recognize both the net book values of the asset and financing obligation. Although we will not begin making lease payments pursuant to the Lease until November 2015, the portion of the lease obligations allocated to the land is treated for accounting purposes as an operating lease that commenced in 2013.
	Additional United States and International Locations
	We also lease an aggregate of approximately 470,000 square feet at approximately 40 other locations across North America, Europe and Asia Pacific, in cities such as, New York, Boston, London, and Beijing, primarily for our sales offices, subsidiary headquarters, and international management teams, pursuant to leases with expiration dates through November 2024.
	The following table summarizes our material commitments and obligations as of December 31, 2014 and excludes amounts already recorded on the consolidated balance sheet:
					By Period
			Total		Less than		1 to 3 years		3 to 5 years		More than
					1 year						5 years
			(in millions)
	Operating leases (1)		$	114	$	19	$	27	$	26	$	42
	Build to suit lease obligation (2)			143		1		18		18		106
	Expected interest payments on Term Loan (3)			9		5		4		—		—
	Total (4)(5)(6)(7)		$	266	$	25	$	49	$	44	$	148
	-1	Estimated future minimum rental payments under operating leases with non-cancelable lease terms.
	-2	Estimated future minimum rental payments for our future corporate headquarters in Needham, MA.
	-3	The amounts included as expected interest payments on the Term Loan in this table are based on the current effective interest rate and payment terms as of December 31, 2014, but, could change significantly in the future. Amounts assume that our existing debt is repaid at maturity and do not assume additional borrowings or refinancings of existing debt. Refer to “Note 8— Debt” for additional information, including principal payments expected to be paid over the next two years, on our Term Loan.
	-4	Excluded from the table was $68 million of unrecognized tax benefits, including accrued interest, that we have recorded in other long-term liabilities for which we cannot make a reasonably reliable estimate of the amount and period of payment. We estimate that approximately $1 million will be paid within the next twelve months.
	-5	Excluded from the table is our obligation to fund a charitable foundation. The Board of Directors of the charitable foundation is currently comprised of Stephen Kaufer- President and Chief Executive Officer, Julie M.B. Bradley-Chief Financial Officer and Seth J. Kalvert- Senior Vice President, General Counsel and Secretary. Our obligation was calculated at 2.0% of OIBA in 2014. For a discussion regarding OIBA see “Note 16— Segment and Geographic Information” in the notes to the consolidated financial statements. This future commitment has been excluded from the table above.
	-6	Excludes spending on anticipated leasehold improvements on our Needham, Massachusetts lease, including design, development, construction costs, and the purchase and installation of equipment, net of related landlord incentives, which we estimate will be in the range of $25-$30 million primarily incurred during the first six months of 2015.
	-7	Excludes current liabilities already recorded on the consolidated balance sheet at December 31, 2014, as these liabilities are expected to be paid within one year.
	Letters of Credit
	As of December 31, 2014, we have issued unused letters of credit totaling $1 million, related to our property leases.
	Off-Balance Sheet Arrangements
	We did not have any off-balance sheet arrangements, as defined in Item 303(a)(4)(ii) of Regulation S-K of the SEC, that have, or are reasonably likely to have, a current or future effect on our financial condition, results of operations, liquidity, capital expenditures or capital resources at December 31, 2014.
	Legal Proceedings
	In the ordinary course of business, we and our subsidiaries are parties to legal proceedings and claims involving alleged infringement of third-party intellectual property rights, defamation, and other claims. Rules of the SEC require the description of material pending legal proceedings, other than ordinary, routine litigation incident to the registrant’s business, and advise that proceedings ordinarily need not be described if they primarily involve damages claims for amounts (exclusive of interest and costs) not individually exceeding 10% of the current assets of the registrant and its subsidiaries on a consolidated basis. In the judgment of management, none of the pending litigation matters that the Company and its subsidiaries are defending involves or is likely to involve amounts of that magnitude. There may be claims or actions pending or threatened against us of which we are currently not aware and the ultimate disposition of which could have a material adverse effect on us.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	NOTE 13: EMPLOYEE BENEFIT PLANS
	Retirement Savings Plan
	The TripAdvisor Retirement Savings Plan (the “401(k) Plan”), qualifies under Section 401(k) of the Internal Revenue Code. The 401(k) Plan allows participating employees, most of our U.S. employees, to make contributions of a specified percentage of their eligible compensation. Participating employees may contribute up to 50% of their eligible salary on a pre-tax basis, but not more than statutory limits. Employee-participants age 50 and over may also contribute an additional amount of their salary on a pre-tax tax basis up to the IRS Catch-Up Provision Limit. Employees may also contribute into the 401(k) Plan on an after-tax basis up to an annual maximum of 10%. The 401(k) Plan has an automatic enrollment feature at 3% pre-tax. We match 50% of the first 6% of employee contributions to the plan for a maximum employer contribution of 3% of a participant’s eligible earnings. The “catch up contributions”, are not eligible for employer matching contributions. The matching contributions portion of an employee’s account, vests after two years of service. Effective June 8, 2012 the 401(k) Plan permits certain after-tax Roth 401(k) contributions. Additionally, at the end of the 401 (k) Plan year, we make a discretionary matching contribution to eligible participants. This additional discretionary matching employer contribution referred to as “true up” is limited to match only contributions up to 3% of eligible compensation.
	We also have various defined contribution plans for our international employees. Our contribution to the 401(k) Plan and our international defined contribution plans was $5 million, $5 million, and $3 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	TripAdvisor, Inc. Deferred Compensation Plan for Non-Employee Directors
	On December 20, 2011, the TripAdvisor, Inc. Deferred Compensation Plan for Non-Employee Directors (the “Plan”) became effective. Under the Plan, eligible directors who defer their directors’ fees may elect to have such deferred fees (i) applied to the purchase of share units, representing the number of shares of our common stock that could have been purchased on the date such fees would otherwise be payable, or (ii) credited to a cash fund. The cash fund will be credited with interest at an annual rate equal to the weighted average prime or base lending rate of a financial institution selected in accordance with the terms of the Plan and applicable law. Upon termination of service as a director of TripAdvisor, a director will receive (i) with respect to share units, such number of shares of our common stock as the share units represent, and (ii) with respect to the cash fund, a cash payment. Payments upon termination will be made in either one lump sum or up to five annual installments, as elected by the eligible director at the time of the deferral election.
	Under the 2011 Incentive Plan, 100,000 shares of TripAdvisor common stock are available for issuance to non-employee directors. From the inception of the Plan through December 31, 2014, a total of 557 shares have been reserved for such purpose.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity	NOTE 14: STOCKHOLDERS’ EQUITY
	Preferred Stock
	In addition to common stock, we are authorized to issue up to 100 million preferred shares, with $ 0.001 par value per share, with terms determined by our Board of Directors, without further action by our stockholders. At December 31, 2014, no preferred shares had been issued.
	Common Stock and Class B Common Stock
	Our authorized common stock consists of 1.6 billion shares of common stock with par value of $0.001 per share, and 400 million shares of Class B common stock with par value of $0.001 per share. Both classes of common stock qualify for and share equally in dividends, if declared by our Board of Directors. Common stock is entitled to one vote per share and Class B common stock is entitled to 10 votes per share on most matters. Holders of TripAdvisor common stock, acting as a single class, are entitled to elect a number of directors equal to 25% percent of the total number of directors, rounded up to the next whole number, which was three directors as of December 31, 2014. Class B common stockholders may, at any time, convert their shares into common stock, on a one for one share basis. Upon conversion, the Class B common stock is retired and is not available for reissue. In the event of liquidation, dissolution, distribution of assets or winding-up of TripAdvisor the holders of both classes of common stock have equal rights to receive all the assets of TripAdvisor after the rights of the holders of the preferred stock have been satisfied. There were 132,315,465 and 130,121,292 shares of common stock issued and outstanding, respectively, at December 31, 2014 and 12,799,999 shares of Class B common stock issued and outstanding at December 31, 2014.
	Accumulated Other Comprehensive Income (Loss)
	Accumulated other comprehensive loss is primarily comprised of accumulated foreign currency translation adjustments, as follows for the periods presented:
			December 31,			December 31,
			2014			2013
			(In millions)
	Cumulative foreign currency translation adjustments (1)		$	(31	)	$	—
	Total accumulated other comprehensive loss		$	(31	)	$	—
	-1	We consider our foreign subsidiary earnings indefinitely reinvested; therefore; deferred taxes are not provided on foreign currency translation adjustments.
	Treasury Stock
	On February 15, 2013, our Board of Directors authorized the repurchase of $250 million of our shares of common stock under a share repurchase program. We intend to use available cash and future cash from operations to fund repurchases under the share repurchase program. The repurchase program has no expiration date but may be suspended or terminated by the Board of Directors at any time. Our Board of Directors will determine the price, timing, amount and method of such repurchases based on its evaluation of market conditions and other factors, and any shares repurchased will be in compliance with applicable legal requirements, at prices determined to be attractive and in the best interests of both the Company and its stockholders.
	As of December 31, 2014, we have repurchased 2,120,709 shares of outstanding common stock under the share repurchase program at an aggregate cost of $145 million. We did not repurchase any shares under this share repurchase program during the year ended December 31, 2014.  As of December 31, 2014, from the authorized share repurchase program granted by the Board of Directors we have $105 million remaining to repurchase shares of our common stock.
	Dividends
	During the years ended December 31, 2014, 2013 and 2012, our Board of Directors did not declare any dividends on our outstanding common stock and do not expect to pay any dividends for the foreseeable future.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 15: RELATED PARTY TRANSACTIONS
	Relationship between Expedia and TripAdvisor
	Upon consummation of the Spin-Off, Expedia was considered a related party under GAAP based on a number of factors, including, among others, common ownership of our shares and those of Expedia.  However, we no longer consider Expedia a related party.   For purposes of governing certain of the ongoing relationships between us and Expedia at and after the Spin-Off, and to provide for an orderly transition, we and Expedia entered into various agreements at the time of the Spin-Off, which TripAdvisor has satisfied its obligations. However, TripAdvisor continues to be subject to certain post-spin obligations under the Tax Sharing Agreement.
	Under the Tax Sharing Agreement between us and Expedia, we are generally required to indemnify Expedia for any taxes resulting from the Spin-Off (and any related interest, penalties, legal and professional fees, and all costs and damages associated with related stockholder litigation or controversies) to the extent such amounts resulted from (i) any act or failure to act by us described in the covenants in the tax sharing agreement, (ii) any acquisition of our equity securities or assets or those of a member of our group, or (iii) any failure of the representations with respect to us or any member of our group to be true or any breach by us or any member of our group of any covenant, in each case, which is contained in the separation documents or in the documents relating to the IRS private letter ruling and/or the opinion of counsel. The full text of the Tax Sharing Agreement is incorporated by reference in this Annual Report on Form 10K as Exhibit 10.2. Refer to “Note 9— Income Taxes” above for information regarding the status of completed and ongoing IRS audits of our consolidated income tax returns with Expedia to date.
	Relationship between Liberty Interactive Corporation, Liberty TripAdvisor Holdings, Inc. and TripAdvisor
	On December 11, 2012, Liberty Interactive Corporation, or Liberty, purchased an aggregate of 4,799,848 shares of common stock of TripAdvisor from Barry Diller, our former Chairman of the Board of Directors and Senior Executive, and certain of his affiliates (the “Stock Purchase”). As of December 31, 2013, Liberty beneficially owned 18,159,752 shares of our common stock and 12,799,999 shares of our Class B common stock and was considered a related party with TripAdvisor.
	On August 27, 2014, the entire beneficial ownership of our common stock and Class B common stock held by Liberty was indirectly acquired by Liberty TripAdvisor Holdings, Inc. (“LTRIP”) by means of a spin-off (the “Liberty Spin-Off”). In the Liberty Spin-Off, Liberty, LTRIP’s former parent company, distributed, by means of a dividend, to the holders of its Liberty Ventures common stock, Liberty’s entire equity interest in LTRIP.  As a result of the Liberty Spin-Off, LTRIP became a separate, publicly traded company and 100% of Liberty’s interest in TripAdvisor is now held by LTRIP.  Given the change in ownership of our shares, we no longer consider Liberty a related party effective as of the Liberty Spin-Off.
	As of December 31, 2014, LTRIP beneficially owned 18,159,752 shares of our common stock and 12,799,999 shares of our Class B common stock, which shares constitute 14.0% of the outstanding shares of Common Stock and 100% of the outstanding shares of Class B Common Stock. Assuming the conversion of all of LTRIP’s shares of Class B common stock into common stock, LTRIP would beneficially own 21.7% of the outstanding common stock (calculated in accordance with Rule 13d-3). Because each share of Class B common stock is generally entitled to ten votes per share and each share of common stock is entitled to one vote per share, LTRIP may be deemed to beneficially own equity securities representing approximately 56.6% of our voting power. We consider LTRIP a related party at December 31, 2014.
	We had no material related party transactions with Liberty or LTRIP during the years ended December 31, 2014, 2013 or 2012.

Segment_and_Geographic_Informa

Segment and Geographic Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment and Geographic Information	NOTE 16: SEGMENT AND GEOGRAPHIC INFORMATION
	Segment Information
	During the fourth quarter of 2014, management changed TripAdvisor’s reportable segments to reflect changes in the management reporting structure of the organization, primarily due to recent business acquisitions, and the manner in which the chief operating decision maker, or CODM, regularly assesses information and evaluates performance for operating decision-making purposes, including allocation of resources. We believe this new segment structure better provides the CODM with information to assess performance and to make resource allocation decisions. The CODM for the company is our Chief Executive Officer.
	The revised reporting structure includes two reportable segments: Hotel and Other. Our Other segment consists of the aggregation of three operating segments, which include our Vacation Rentals, Restaurants and Attractions businesses. All prior periods have been reclassified to conform to the current reporting structure.
	Hotel
	Our Hotel segment includes revenue generated from services related to hotels, including click-based and display-based advertising revenue from making hotel room nights, airline reservations, and cruise reservations available for price comparison and booking, as well as subscription-based products such as Business Listings, transaction-based products such as Jetsetter and Tingo, and other revenue related to hotels. Our CODM is also the Hotel segment manager.
	Other
	Attractions.  We provide, through Viator, information and services for researching and booking destination activities around the world. Viator works with local operators to provide travelers with access to tours and activities in popular destinations worldwide, earning a commission for such service. In addition to its consumer-direct business, Viator also provides local experiences to affiliate partners, including some of the world’s top airlines, hotels and travel agencies.
	Restaurants.  This business is comprised of our websites that provide online and mobile reservation services that connect restaurants with diners.  These websites are currently focused on the European market, primarily through Lafourchette.  Lafourchette is an online restaurant booking platform with a network of restaurant partners across Europe.  Lafourchette also offers management software solutions helping restaurants to maximize business by providing a flexible online booking, discount and data tool. Revenue is primarily generated by receiving a fee for each restaurant guest seated through the online reservation systems.
	Vacation Rentals. We offer individual property owners and property managers the ability to list their properties available for rental and connect with travelers using a subscription-based fee structure or a free-to-list, commission per booking based option. Our vacation rental inventory currently includes full home rentals, condos, villas, beach rentals, cabins, cottages, and many other accommodation types.  These properties are listed across a number of platforms, including TripAdvisor Vacation Rentals, U.S.-based FlipKey (which includes Vacation Home Rentals acquired during 2014), and European-based Holiday Lettings and Niumba.
	Each operating segment in our Other segment has a segment manager who is directly accountable to and maintains regular contact with our chief operating decision maker to discuss operating activities, financial results, forecasts, and plans for the segment.
	Our primary operating metric for evaluating segment performance is Adjusted EBITDA, which is a non-GAAP financial measure. We define Adjusted EBITDA as net income (loss) plus: (1) provision for income taxes; (2) other income (expense), net; (3) depreciation of property and equipment, including amortization of internal use software and website development; (4) amortization of intangible assets; (5) stock-based compensation; and (6) non-recurring expenses. Such amounts are detailed in our segment reconciliation below. In addition, please see our discussion of Adjusted EBITDA in the section of this Annual Report on Form 10-K entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
	The following tables present our segment information for the years ended December 31, 2014, 2013 and 2012. We record depreciation of property and equipment, including amortization of internal-use software and website development, amortization of intangible assets, stock-based compensation, other expense, net, other non-recurring expenses, net, and income taxes, which are excluded from segment operating performance, in Corporate and unallocated. In addition, we do not report our assets or capital expenditures by segment as it would not be meaningful. We also do not regularly provide asset, capital expenditure or depreciation information by segment to our CODM. Our consolidated general and administrative expenses, excluding stock-based compensation costs, are shared by all operating segments.  Each operating segment receives an allocated charge based on the segment’s percentage of the Company’s total personnel costs.
			Year ended December 31, 2014
			Hotel			Other			Corporate and			Total
									unallocated
			(in millions)
	Revenue		$	1,135		$	111		$	—		$	1,246
	Adjusted EBITDA (1)			472			(4	)		—			468
	Depreciation			—			—			(47	)		(47	)
	Amortization of intangible assets			—			—			(18	)		(18	)
	Stock-based compensation			—			—			(63	)		(63	)
	Operating income (loss)		$	472		$	(4	)	$	(128	)		340
	Other expense, net												(18	)
	Income before income taxes												322
	Provision for income taxes												(96	)
	Net income												226
			Year ended December 31, 2013
			Hotel			Other			Corporate and			Total
									unallocated
			(in millions)
	Revenue		$	899		$	46		$	—		$	945
	Adjusted EBITDA (1)			384			(5	)		—			379
	Depreciation			—			—			(30	)		(30	)
	Amortization of intangible assets			—			—			(6	)		(6	)
	Stock-based compensation			—			—			(49	)		(49	)
	Operating income (loss)		$	384		$	(5	)	$	(85	)		294
	Other expense, net												(10	)
	Income before income taxes												284
	Provision for income taxes												(79	)
	Net income												205
			Year ended December 31, 2012
			Hotel			Other			Corporate and			Total
									unallocated
			(in millions)
	Revenue		$	732		$	31		$	—		$	763
	Adjusted EBITDA (1)			349			3			—			352
	Depreciation			—			—			(20	)		(20	)
	Amortization of intangible assets			—			—			(6	)		(6	)
	Stock-based compensation			—			—			(30	)		(30	)
	Operating income (loss)		$	349		$	3		$	(56	)		296
	Other expense, net												(14	)
	Income before income taxes												282
	Provision for income taxes												(87	)
	Net income												195
	-1	Includes allocated general and administrative expenses in our Hotel segment of $87 million, $72 million and $56 million; and in our Other segment of $18 million, $9 million and $6 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	The following table is a reconciliation of our Adjusted EBITDA to net income, the most directly comparable financial measure calculated and presented in accordance with GAAP, for the periods presented:
			Year ended December 31,
			2014			2013			2012
			(in millions)
	Adjusted EBITDA		$	468		$	379		$	352
	Depreciation (1)			(47	)		(30	)		(20	)
	OIBA (2)			421			349			332
	Amortization of intangible assets			(18	)		(6	)		(6	)
Stock-based compensation			(63	)		(49	)		(30	)
Other expense, net			(18	)		(10	)		(14	)
Provision for income taxes			(96	)		(79	)		(87	)
Net income		$	226		$	205		$	195
-1	Includes amortization of internal use software and website development costs.
-2	We define OIBA as net income (loss) plus: (1) provision for income taxes; (2) other income (expense), net; (3) stock-based compensation; (4) amortization of intangible assets; and (5) non-recurring expenses. This operating metric is only used by our management to calculate our annual obligation for our charitable foundation. Refer to “Note 12— Commitments and Contingencies” for a discussion of our charitable foundation.
Revenue and Geographic Information
We derive the substantial portion of our revenue through the sale of advertising, primarily through click-based advertising and, to a lesser extent, display-based advertising. In addition, we earn revenue from a combination of subscription-based and transaction-based offerings, including: Business Listings; subscription and commission-based offerings from our Vacation Rentals products; transaction revenue from selling room nights; selling destination activities; fulfilling online restaurant reservations; as well as other revenue including content licensing.
The following table presents revenue by product for the periods presented:
		Year ended December 31,
		2014			2013			2012
		(in millions)
Click-based advertising		$	870		$	696		$	588
Display-based advertising			140			119			94
Subscription, transaction and other			236			130			81
Total revenue		$	1,246		$	945		$	763
The following table presents revenue by geographic area, the United States, the United Kingdom and all other countries, based on the geographic location of our websites for the periods presented:
		Year ended December 31,
		2014			2013			2012
		(in millions)
Revenue
United States		$	593		$	463		$	386
United Kingdom			191			141			110
All other countries			462			341			267
		$	1,246		$	945		$	763
The following table presents property and equipment, net for the United States and all other countries based on the geographic location of the assets for the periods presented:
		December 31,
		2014			2013
		(in millions)
Property and equipment, net
United States		$	170		$	67
All other countries			25			15
		$	195		$	82

Interest_Income_and_Other_Net

Interest Income and Other, Net	12 Months Ended
	Dec. 31, 2014
Interest And Other Income [Abstract]
Interest Income and Other, Net	NOTE 17: INTEREST INCOME AND OTHER, NET
	The following table presents the detail of interest income and other, net, for the periods presented:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Net loss, realized and unrealized, on foreign exchange and	$	(10	)	$	(2	)	$	(3	)
	foreign currency derivative contracts and other, net
	Interest income		1			2			-
	Total interest income and other, net	$	(9	)	$	-		$	(3	)

Quarterly_Financial_Informatio

Quarterly Financial Information	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	TripAdvisor, Inc.
	Quarterly Financial Information (Unaudited)
	(in thousands, except per share data)
	The following table presents selected unaudited financial information for the eight quarters in the period ended December 31, 2014. The results for any quarter are not necessarily indicative of future quarterly results and, accordingly, period to period comparisons should not be relied upon as an indication of future performance.
		Three Months Ended
		March 31		June 30		September 30		December 31
		(in millions)
	Year ended December 31, 2014
	Revenue	$	281	$	323	$	354	$	288
	Operating income		96		100		84		60
	Net income		68		68		54		36
	Net income attributable to TripAdvisor, Inc.		68		68		54		36
	Basic earnings per share	$	0.48	$	0.48	$	0.38	$	0.25
	Diluted earnings per share	$	0.47	$	0.47	$	0.37	$	0.25
	Year ended December 31, 2013
	Revenue	$	230	$	247	$	255	$	213
	Operating income		88		94		84		28
	Net income		62		67		56		20
	Net income attributable to TripAdvisor, Inc.		62		67		56		20
	Basic earnings per share	$	0.44	$	0.47	$	0.39	$	0.14
	Diluted earnings per share	$	0.43	$	0.46	$	0.38	$	0.14

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	The accompanying consolidated financial statements include TripAdvisor, our wholly-owned subsidiaries, and entities we control, or in which we have a variable interest and are the primary beneficiary of expected cash profits or losses. We record noncontrolling interest in our consolidated financial statements to recognize the minority ownership interest in our consolidated subsidiaries. Noncontrolling interest in the earnings and losses of consolidated subsidiaries represent the share of net income or loss allocated to members or partners in our consolidated entities. We have eliminated significant intercompany transactions and accounts. The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”).
	Certain of our subsidiaries that operate in China, have variable interests in affiliated entities in China in order to comply with Chinese laws and regulations, which restrict foreign investment in Internet content provision businesses. Although we do not own the capital stock of some of our Chinese affiliates, we consolidate their results as we are the primary beneficiary of the cash losses or profits of these variable interest affiliates and have the power to direct the activities of these affiliates. Our variable interest entities are not material for all periods presented.
Accounting Estimates	Accounting Estimates
	We use estimates and assumptions in the preparation of our consolidated financial statements in accordance with GAAP. Our estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of our consolidated financial statements. These estimates and assumptions also affect the reported amount of net income or loss during any period. Our actual financial results could differ significantly from these estimates. The significant estimates underlying our consolidated financial statements include; (i) recoverability of intangible assets and goodwill; (ii) recoverability and useful life of long-lived assets; (iii) accounting for income taxes; (iv) purchase accounting for business combinations and (v) stock-based compensation.
Reclassifications	Reclassifications
	As previously disclosed, we no longer consider Expedia a related party. Certain reclassifications have been made to conform the prior period to the current presentation relating to Expedia transactions, which includes the reclassification of revenue from Expedia on our statements of operations for the years ended December 31, 2013 and 2012 of $217 million and $204 million, respectively, to revenue, the reclassification of receivables at December 31, 2013 of $16 million, from Expedia, net on our consolidated balance sheets to accounts receivable, as well as operating cash flow reclassifications related to Expedia for the years ended December 31, 2013 and 2012 of cash provided of $8 million and cash used of $17 million, respectively, to operating cash flows for accounts receivable on our consolidated statements of cash flows those years. These reclassifications had no net effect on our consolidated financial statements.
	In addition, as discussed above, we revised our reportable segment structure during the fourth quarter of 2014. Consequently all prior periods have been reclassified to conform to the current reporting structure, which is reflected in all required segment disclosures made in this Form 10-K. These reclassifications had no effect on our consolidated financial statements.
	All other reclassifications, made to conform the prior period to the current presentation, were not material and had no net effect on our consolidated financial statements.
Revenue Recognition	Revenue Recognition
	We recognize revenue from our services rendered when the following four revenue recognition criteria are met: persuasive evidence of an arrangement exists, services have been rendered, the price is fixed or determinable, and collectability is reasonably assured. Deferred revenue, which primarily relates to our subscription-based and commission based arrangements, is recorded when payments are received in advance of our performance as required by the underlying agreements.
	Click-based Advertising. Revenue is derived primarily from click-through fees charged to our travel partners for traveler leads sent to the travel partners’ website. We record revenue from click-through fees after the traveler makes the click-through to the travel partners’ websites.
	Instant booking commission revenue is recorded at the time a traveler books a hotel transaction on our site where we do not assume cancellation risk. In transactions in which we assume cancellation risk, we record revenue when we receive cash from our travel partners, given the current uncertainty of the traveler’s stay.  We have no post-booking service obligations for Instant Booking transactions.
	Display-based Advertising. We recognize display advertising revenue ratably over the advertising period or upon delivery of advertising impressions, depending on the terms of the advertising contract. Subscription-based revenue is recognized ratably over the related contractual period over which service is delivered.
	Attractions. We receive cash from the consumer at the time of booking of the destination activity and record these amounts, net of commissions, as deferred merchant payables on our consolidated balance sheet. Commission revenue is recorded as deferred revenue at the time of booking and later recognized when the consumer has completed the destination activity or as the consumer’s refund privileges lapse. We pay the destination activity operators after the travelers’ use.
	Restaurants. We recognize reservation revenues (or per seated diner fees) on a transaction-by-transaction basis as diners are seated by our restaurant customers. Subscription-based revenue is recognized ratably over the related contractual period over which the service is delivered.
	Vacation Rentals. We generate revenue from customers for online advertising listing services related to the listing of their properties for rent on a subscription basis, over a fixed-term, or on a free-to-list option. Payments for term-based paid subscriptions received in advance of services being rendered are recorded as deferred revenue and recognized ratably on a straight-line basis over the listing period. We generate commission revenue from our free-to-list bookings option. We receive cash from travelers at the time of booking, net of commissions, and record as deferred merchant payables on our consolidated balance sheet. Commission revenue is recorded as deferred revenue at the time of booking and later recognized when the traveler has completed the stay or as the travelers’ refund privileges lapse. We pay the customer or property owner after the travelers’ stay.
Cost of Revenue	Cost of Revenue
	Cost of revenue consists of expenses that are directly related or closely correlated to revenue generation, including direct costs, such as ad serving fees, flight search fees, transaction fees and data center costs.  In addition, cost of revenue includes personnel and overhead expenses, including salaries, benefits, stock-based compensation and bonuses for certain customer support personnel who are directly involved in revenue generation.
Selling and Marketing	Selling and Marketing
	Sales and marketing expenses primarily consist of direct costs, including SEM and other online traffic acquisition costs, syndication costs and affiliate program commissions, brand advertising, television and other offline advertising, and public relations. In addition, our indirect sales and marketing expense consists of personnel and overhead expenses, including salaries, commissions, benefits, stock-based compensation expense and bonuses for sales, sales support, customer support and marketing employees.
Technology and Content	Technology and Content
	Technology and content expenses consist of personnel and overhead expenses, including salaries and benefits, stock-based compensation expense and bonuses for salaried employees and contractors engaged in the design, development, testing, content support, and maintenance of our websites and mobile apps. Other costs include licensing, maintenance expense, computer supplies, and technology hardware.
General and Administrative	General and Administrative
	General and administrative expense consists primarily of personnel and related overhead costs, including executive leadership, finance, legal and human resource functions and stock-based compensation as well as professional service fees and other fees including audit, legal, tax and accounting, and other costs including bad debt expense and our charitable foundation costs.
Interest Income and Other, net	Interest Income and Other, net
	Interest income and other, net primarily consists of interest earned and amortization of discounts and premiums on our marketable securities, and net foreign exchange gains and losses.
Interest Expense	Interest Expense
	Interest expense primarily consists of interest incurred, commitment fees and debt issuance cost amortization related to our Credit Agreement and Chinese Credit Facilities.
Cash, Cash Equivalents and Marketable Securities	Cash, Cash Equivalents and Marketable Securities
	Our cash equivalents consist of highly liquid investments with maturities of 90 days or less at the date of purchase. Our marketable debt and equity securities have been classified and accounted for as available-for-sale. We determine the appropriate classification of our investments at the time of purchase and reevaluate the designations at each balance sheet date. We invest in highly-rated securities, and our investment policy limits the amount of credit exposure to any one issuer, industry group and currency. The policy requires investments to be investment grade, with the primary objective of minimizing the potential risk of principal loss and providing liquidity of investments sufficient to meet our operating and capital spending requirements and debt repayments.
	We classify our marketable debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date and as to whether and when we intend to sell a particular security prior to its maturity date. Marketable debt securities with maturities greater than 90 days at the date of purchase and 12 months or less remaining at the balance sheet date will be classified as short-term and marketable debt securities with maturities greater than 12 months from the balance sheet date will generally be classified as long-term. We classify our marketable equity securities, limited to money market funds and mutual funds, as either short-term or long-term based on the nature of each security and its availability for use in current operations. Our marketable debt and equity securities are carried at fair value, with the unrealized gains and losses, net of taxes, reported in accumulated other comprehensive income (loss) as a component of stockholders’ equity. Fair values are determined for each individual security in the investment portfolio.
	Realized gains and losses on the sale of securities are determined by specific identification of each security’s cost basis. We may sell certain of our marketable securities prior to their stated maturities for strategic reasons including, but not limited to, anticipation of credit deterioration and liquidity and duration management. The weighted average maturity of our total invested cash shall not exceed 18 months, and no security shall have a final maturity date greater than three years.
	We continually review our available for sale securities to determine whether a decline in fair value below the carrying value is other than temporary. When evaluating an investment for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, and our intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s cost basis. Once a decline in fair value is determined to be other than temporary, an impairment charge is recorded and a new cost basis in the investment is established. If we do not intend to sell the debt security, but it is probable that we will not collect all amounts due, then only the impairment due to the credit risk would be recognized in earnings and the remaining amount of the impairment would be recognized in accumulated other comprehensive loss within stockholders’ equity.
	Cash consists of cash deposits held in global financial institutions.
Fair Value Measurements	Fair Value Measurements
	We apply fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. We measure assets and liabilities at fair value based on the expected exit price, which is the amount that would be received on the sale of an asset or amount paid to transfer a liability, as the case may be, in an orderly transaction between market participants in the principal or most advantageous market in which we would transact. As such, fair value may be based on assumptions that market participants would use in pricing an asset or liability at the measurement date. The authoritative guidance on fair value measurements establishes a consistent framework for measuring fair value on either a recurring or nonrecurring basis whereby inputs, used in valuation techniques, are assigned a hierarchical level. The following are the hierarchical levels of inputs to measure fair value:
	Level 1—Valuations are based on quoted prices for identical assets and liabilities in active markets.
	Level 2—Valuations are based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.
	Level 3—Valuations are based on unobservable inputs reflecting our own assumptions, consistent with reasonably available assumptions made by other market participants. These valuations require significant judgment.
Derivative Financial Instruments	Derivative Financial Instruments
	Our goal in managing our foreign exchange risk is to reduce, to the extent practicable, our potential exposure to the changes that exchange rates might have on our earnings, cash flows and financial position. We do not use derivatives for trading or speculative purposes.  We account for our derivative instruments as either assets or liabilities and carry them at fair value.
	For derivative instruments that hedge the exposure to variability in expected future cash flows that are designated as cash flow hedges, the effective portion of the gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity and reclassified into income in the same period or periods during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument, if any, is recognized in current income. To receive hedge accounting treatment, cash flow hedges must be highly effective in offsetting changes to expected future cash flows on hedged transactions. For options designated as cash flow hedges, changes in the time value are excluded from the assessment of hedge effectiveness and are recognized in income. For derivative instruments that hedge the exposure to changes in the fair value of an asset or a liability and that are designated as fair value hedges, both the net gain or loss on the derivative instrument as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in earnings in the current period. The net gain or loss on the effective portion of a derivative instrument that is designated as an economic hedge of the foreign currency translation exposure of the net investment in a foreign operation is reported in the same manner as a foreign currency translation adjustment. For forward exchange contracts designated as net investment hedges, we exclude changes in fair value relating to changes in the forward carrying component from its definition of effectiveness. Accordingly, any gains or losses related to this component are recognized in current income. We have not entered into any cash flow, fair value or net investment hedges to date as of December 31, 2014.
	Derivatives that do not qualify for hedge accounting must be adjusted to fair value through current income. In certain circumstances, we enter into foreign currency forward exchange contracts (“forward contracts”) to reduce the effects of fluctuating foreign currency exchange rates on our cash flows denominated in foreign currencies. Our derivative instruments or forward contracts entered into are not designated as hedges as of December 31, 2014 are disclosed below in “Note 5— Financial Instruments” in the notes to the consolidated financial statements. Monetary assets and liabilities denominated in a currency other than the functional currency of a given subsidiary are remeasured at spot rates in effect on the balance sheet date with the effects of changes in spot rates reported in other, net on our consolidated statements of operations. Accordingly, fair value changes in the forward contracts help mitigate the changes in the value of the remeasured assets and liabilities attributable to changes in foreign currency exchange rates, except to the extent of the spot-forward differences. These differences are not expected to be significant due to the short-term nature of the contracts, which to date, have generally had maturities at inception of 90 days or less.  The net cash received or paid related to our derivative instruments are classified as an operating activity in our consolidated statements of cash flow, which is based on the objective of the derivative instruments. These net cash flows have not been material in any reporting period to date.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are generally due within 30 days and are recorded net of an allowance for doubtful accounts. We record accounts receivable at the invoiced amount. Collateral is not required for accounts receivable. We consider accounts outstanding longer than the contractual payment terms as past due. We determine our allowance by considering a number of factors, including the length of time trade accounts receivable are past due, previous loss history, a specific customer’s ability to pay its obligations to us, and the condition of the general economy and industry as a whole.
	The following table presents the changes in the allowance for doubtful accounts for the periods presented:
			December 31,
			2014		2013			2012
			(in millions)
	Allowance for doubtful accounts:
	Balance, beginning of period		$	3	$	3		$	5
	Charges (recoveries) to earnings			3		1			(1	)
	Write-offs, net of recoveries and other adjustments			1		(1	)		(1	)
	Balance, end of period		$	7	$	3		$	3
Property and Equipment, Including Website and Software Development Costs	Property and Equipment, Including Website and Software Development Costs
	We record property and equipment at cost, net of accumulated depreciation. We capitalize certain costs incurred during the application development stage related to the development of websites and internal use software when it is probable the project will be completed and the software will be used as intended. Capitalized costs include internal and external costs, if direct and incremental, and deemed by management to be significant. We expense costs related to the planning and post-implementation phases of software and website development as these costs are incurred. Maintenance and enhancement costs (including those costs in the post-implementation stages) are typically expensed as incurred, unless such costs relate to substantial upgrades and enhancements to the website or software resulting in added functionality, in which case the costs are capitalized.
	We compute depreciation using the straight-line method over the estimated useful lives of the assets, which is three to five years for computer equipment, capitalized software and website development, office furniture and other equipment. We depreciate leasehold improvements using the straight-line method, over the shorter of the estimated useful life of the improvement or the remaining term of the lease.
Leases	Leases
	We lease office space in several countries around the world under non-cancelable lease agreements. We generally lease our office facilities under operating lease agreements. Office facilities subject to an operating lease and the related lease payments are not recorded on our balance sheet. The terms of certain lease agreements provide for rental payments on a graduated basis, however, we recognize rent expense on a straight-line basis over the lease period in accordance with GAAP. Any lease incentives are recognized as reductions of rental expense on a straight-line basis over the term of the lease. The lease term begins on the date we become legally obligated for the rent payments or when we take possession of the office space, whichever is earlier.
	We establish assets and liabilities for the estimated construction costs incurred under lease arrangements where we are considered the owner for accounting purposes only, or build-to-suit leases, to the extent we are involved in the construction of structural improvements or take construction risk prior to commencement of a lease. Upon occupancy of facilities under build-to-suit leases, we assess whether these arrangements qualify for sales recognition under the sale-leaseback accounting guidance under GAAP. If we continue to be the deemed owner, for accounting purposes, the facilities are accounted for as financing obligations.
	We establish assets and liabilities for the present value of estimated future costs to return certain of our leased facilities to their original condition for asset retirement obligations. Such assets are depreciated over the lease period into operating expense, and the recorded liabilities are accreted to the future value of the estimated restoration costs.
Business Combination Valuations and Recoverability of Goodwill and Indefinite-Lived Intangible Assets	Business Combination Valuations and Recoverability of Goodwill and Indefinite-Lived Intangible Assets
	Goodwill
	We account for acquired businesses using the purchase method of accounting which requires that the assets acquired and liabilities assumed be recorded at the date of acquisition at their respective fair values. Any excess of the purchase price over the estimated fair values of the net assets acquired is recorded as goodwill. We assess goodwill, which is not amortized, for impairment annually as of October 1, or more frequently, if events and circumstances indicate impairment may have occurred. We test goodwill for impairment at the reporting unit level (operating segment or one level below an operating segment). Goodwill is allocated to our reporting units at the date the goodwill is initially recorded. Once goodwill has been allocated to the reporting units, it no longer retains its identification with a particular acquisition and becomes identified with the reporting unit in its entirety. Accordingly, the fair value of the reporting unit as a whole is available to support the recoverability of its goodwill.
	In the evaluation of goodwill for impairment, we generally first perform a qualitative assessment to determine whether it is more likely than not (i.e., a likelihood of more than 50%) that the implied fair value of the reporting unit is less than the carrying amount. If we determine that it is not more likely than not that the implied fair value of the goodwill is less than its carrying amount, no further testing is necessary. If, however, we determine that it is more likely than not that the implied fair value of the goodwill is less than its carrying amount, we then perform a quantitative assessment and compare the implied fair value of the reporting unit to the carrying value. If the carrying value of a reporting unit exceeds its implied fair value, the goodwill of that reporting unit is potentially impaired and we proceed to step two of the impairment analysis. In step two of the analysis, we will record an impairment loss equal to the excess of the carrying value of the reporting unit’s goodwill over its implied fair value should such a circumstance arise.
	In determining the estimated fair value of assets acquired and liabilities assumed in business combinations and for determining implied fair values of reporting units in a quantitative goodwill impairment test, we use one of the following recognized valuation methods: the income approach (including discounted cash flows), the market approach or the cost approach. Our significant estimates in those fair value measurements include identifying business factors such as size, growth, profitability, risk and return on investment and assessing comparable revenue and operating income multiples. Further, when measuring fair value based on discounted cash flows, we make assumptions about risk-adjusted discount rates, future price levels, rates of increase in revenue, cost of revenue, and operating expenses, weighted average cost of capital, rates of long-term growth, and income tax rates. Valuations are performed by management or third party valuation specialists under management's supervision, where appropriate. We believe that the fair values assigned to the assets acquired and liabilities assumed in business combinations and impairment tests are based on reasonable assumptions that marketplace participants would use. However, such assumptions are inherently uncertain and actual results could differ from those estimates.
	As part of our qualitative assessment for our 2014 goodwill impairment analysis on October 1, the factors that we considered included, but were not limited to: (a) changes in macroeconomic conditions in the overall economy and the specific markets in which we operate, (b) our ability to access capital, (c) changes in the online travel industry, (d) changes in the level of competition, (e) comparison of our current financial performance to historical and budgeted results, and (f) changes in excess market capitalization over book value based on our current common stock price and latest unaudited consolidated balance sheet. After considering these factors and the impact that changes in such factors would have on the inputs used in our previous quantitative assessment, we determined that it was more likely than not that goodwill was not impaired.
	Subsequent to the annual impairment test on October 1, 2014, as discussed in “Note 16—Segment and Geographic Information," the composition of our operating segments and our reporting units, has been revised. As a result of this revision, we performed an updated goodwill impairment analysis as of December 31, 2014, for each of our four reporting units which we have identified: Hotels, Vacation Rentals, Restaurants and Attractions.  As part of our qualitative assessment for our Hotel reporting unit, we considered the same factors used above in our October 1 qualitative assessment. As part of our process for our Vacation Rentals, Restaurants and Attractions reporting units, we began our qualitative analysis leveraging quantitative valuations for recent acquisitions in these reporting units, prepared by third party appraisers or management, which were used by management for initial purchase accounting required under GAAP. We then considered many of the same qualitative factors used in our October 1, 2014 qualitative assessment and the impact that changes in such factors would have on the inputs previously used in those recent quantitative valuations. After considering this information, we determined that, regarding all reporting units, it was more likely than not that these assets were not impaired at December 31, 2014.
	Indefinite-Lived Intangible Assets
	Intangible assets that have indefinite lives are not amortized and are tested for impairment annually on October 1, or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Similar to the qualitative assessment for goodwill, we may assess qualitative factors to determine if it is more likely than not that the implied fair value of the indefinite-lived intangible asset is less than its carrying amount. If we determine that it is not more likely than not that the implied fair value of the indefinite-lived intangible asset is less than its carrying amount, no further testing is necessary. If, however, we determine that it is more likely than not that the implied fair value of the indefinite-lived intangible asset is less than its carrying amount, we compare the implied fair value of the indefinite-lived asset with its carrying amount. If the carrying value of an individual indefinite-lived intangible asset exceeds its implied fair value, the individual asset is written down by an amount equal to such excess. The assessment of qualitative factors is optional and at our discretion. We may bypass the qualitative assessment for any indefinite-lived intangible asset in any period and resume performing the qualitative assessment in any subsequent period.
	As part of our qualitative assessment for our 2014 impairment analysis on October 1, the factors that we considered for our indefinite-lived intangible assets included, but were not limited to: (a) changes in macroeconomic conditions in the overall economy and the specific markets in which we operate, (b) our ability to access capital, (c) changes in the online travel industry, (d) changes in the level of competition, (e) comparison of our current financial performance to historical and budgeted results, (f) changes in excess market capitalization over book value based on our current common stock price and latest unaudited consolidated balance sheet, and (g) comparison of the excess of the fair value of our trade names and trademarks to the carrying value of those same assets, using the results of our most recent quantitative assessment. After considering these factors and the impact that changes in such factors would have on the inputs used in our previous quantitative assessment, we determined that it was more likely than not that these assets were not impaired.
	Since the annual impairment test on October 1, 2014, there have been no events or changes in circumstances to indicate any potential impairment to our indefinite lived intangible assets. In the event that future circumstances indicate that our indefinite-lived intangibles are impaired, an impairment charge would be recorded.
	There were no impairment charges recognized to our consolidated statement of operations during the years ended December 31, 2014, 2013 and 2012 related to our goodwill or indefinite-lived intangible assets.
Recoverability of Intangible Assets with Definite Lives and Other Long-Lived Assets	Recoverability of Intangible Assets with Definite Lives and Other Long-Lived Assets
	Intangible assets with definite lives and other long-lived assets are carried at cost and are amortized on a straight-line basis over their estimated useful lives of two to twelve years. The straight-line method of amortization is currently used for our definite-lived intangible assets as it approximates, or is our best estimate, of the distribution of the economic use of our identifiable intangible assets. We review the carrying value of long-lived assets or asset groups, including property and equipment, to be used in operations whenever events or changes in circumstances indicate that the carrying amount of the assets might not be recoverable.
	Factors that would necessitate an impairment assessment include a significant adverse change in the extent or manner in which an asset is used, a significant adverse change in legal factors or the business climate that could affect the value of the asset, or a significant decline in the observable market value of an asset, among others. If such facts indicate a potential impairment, we assess the recoverability of the asset by determining if the carrying value of the asset exceeds the sum of the projected undiscounted cash flows expected to result from the use and eventual disposition of the asset over the remaining economic life of the asset. If the recoverability test indicates that the carrying value of the asset is not recoverable, we will estimate the fair value of the asset using appropriate valuation methodologies which would typically include an estimate of discounted cash flows. Any impairment would be measured by the amount that the carrying value of such assets exceeds their fair value and would be included in operating income on the consolidated statement of operations. We have not identified any circumstances that would warrant an impairment assessment of any recorded assets in our consolidated balance sheet at December 31, 2014.
Income Taxes	Income Taxes
	We record income taxes under the asset and liability method. Deferred tax assets and liabilities reflect our estimation of the future tax consequences of temporary differences between the carrying amounts of assets and liabilities for book and tax purposes. We determine deferred income taxes based on the differences in accounting methods and timing between financial statement and income tax reporting. Accordingly, we determine the deferred tax asset or liability for each temporary difference based on the enacted tax rates expected to be in effect when we realize the underlying items of income and expense. We consider all relevant factors when assessing the likelihood of future realization of our deferred tax assets, including our recent earnings experience by jurisdiction, expectations of future taxable income, and the carryforward periods available to us for tax reporting purposes, as well as assessing available tax planning strategies. We may establish a valuation allowance to reduce deferred tax assets to the amount we believe is more likely than not to be realized. Due to inherent complexities arising from the nature of our businesses, future changes in income tax law, tax sharing agreements or variances between our actual and anticipated operating results, we make certain judgments and estimates. Therefore, actual income taxes could materially vary from these estimates.
	We recognize in our consolidated financial statements the impact of a tax position, if that position is more likely than not to be sustained upon an examination, based on the technical merits of the position.
Foreign Currency Translation and Transaction Gains and Losses	Foreign Currency Translation and Transaction Gains and Losses
	Our consolidated financial statements are reported in U.S. dollars. Certain of our subsidiaries outside of the United States use the related local currency as their functional currency and not the U.S. dollar. Therefore assets and liabilities of our foreign subsidiaries are translated at the spot rate in effect at the applicable reporting date, and the consolidated statements of operations are translated at the average exchange rates in effect during the applicable period. The resulting unrealized cumulative translation adjustment is recorded as a component of accumulated other comprehensive income(loss) in stockholders’ equity on our consolidated balance sheet.
	We also have subsidiaries that have transactions in foreign currencies other than their functional currency. Transactions denominated in currencies other than the functional currency are recorded based on exchange rates at the time such transactions arise. Subsequent changes in exchange rates result in transaction gains and losses which are reflected in our consolidated statements of operations as unrealized (based on the applicable period-end exchange rate) or realized upon settlement of the transactions, in other, net.
	Accordingly, we have recorded foreign exchange losses of $10 million, $0 million and $3 million for the years ended December 31, 2014, 2013 and 2012, respectively, in other, net on our consolidated statement of operations. These amounts include gains and losses, realized and unrealized, on foreign currency forward contracts.
Advertising Expense	Advertising Expense
	We incur advertising expense, which includes traffic generation costs from search engines and Internet portals, other online and offline (including television) advertising expense, promotions and public relations to promote our brands. We expense the costs associated with communicating the advertisements in the period in which the advertisement takes place. We initially capitalize and then expense the production costs associated with advertisements in the period in which the advertisement first takes place. For the years ended December 31, 2014, 2013 and 2012, our advertising expense was $341 million, $237 million, and $175 million, respectively. As of December 31, 2014 and 2013, we had $5 million and $1 million of prepaid marketing expenses included in prepaid expenses and other current assets.  We expect to fully expense our prepaid marketing asset of $5 million as of December 31, 2014 to the consolidated statement of operations during 2015.
Stock-Based Compensation	Stock-Based Compensation
	Stock Options. The exercise price for all stock options granted by us to date has been equal to the market price of the underlying shares of common stock at the date of grant. In this regard, when making stock option awards, our practice is to determine the applicable grant date and to specify that the exercise price shall be the closing price of our common stock on the date of grant.
	The estimated grant-date fair value of stock options is calculated using a Black-Scholes Merton option-pricing model (“Black-Scholes model”). The Black-Scholes model incorporates assumptions to value stock-based awards, which includes the risk-free rate of return, expected volatility, expected term and expected dividend yield.
	Our risk-free interest rate is based on the rates currently available on zero-coupon U.S. Treasury issues, in effect at the time of the grant, whose remaining maturity period most closely approximates the stock option’s expected term assumption. We have estimated, to date, the volatility of our common stock by using an average of our historical stock price volatility and of publicly traded companies that we consider peers based on daily price observations.  We have estimated our expected term, to date, using the simplified method, as we have not had sufficient historical exercise data on our common stock to date. Our expected dividend yield is zero, as we have not paid any dividends on our common stock to date and do not expect to pay any cash dividends for the foreseeable future.
	Our stock options generally have a term of ten years from the date of grant and generally vest equitably over a four-year requisite service period. We amortize the grant-date fair value of our stock option grants, net of estimated forfeitures, as stock-based compensation expense over the vesting term on a straight-line basis, with the amount of compensation expense recognized at any date at least equaling the portion of the grant-date fair value of the award that is vested at that date.
	As the Company now has three years of post-Spin-Off equity award activity, beginning in February 2015, we will change our method of estimating our expected term from the simplified method and use historical exercise behavior and expected post-vest termination data. Simultaneously, we will also begin estimating our expected volatility by equally weighting the historical volatility and implied volatility on our own stock.  Historical volatility will be determined using actual daily price observations of our stock price over a period equivalent to or approximate to the expected term of our stock option grants to date. Implied volatility represents the volatility of our actively traded options on our stock, with remaining maturities in excess of twelve months and market prices approximate to the exercise prices of the stock option grant. These changes are not expected to materially affect our future consolidated financial statements.
	Restricted Stock Units. RSUs are stock awards that are granted to employees entitling the holder to shares of our common stock as the award vests. RSUs are measured at fair value based on the number of shares granted and the quoted price of our common stock at the date of grant. We amortize the fair value of RSUs, net of estimated forfeitures, as stock-based compensation expense over the vesting term of generally four years on a straight-line basis, with the amount of compensation expense recognized at any date at least equaling the portion of the grant-date fair value of the award that is vested at that date.
	Performance-based stock options and RSUs vest upon achievement of certain company-based performance conditions and a requisite service period. On the date of grant, the fair value of performance-based award is determined based on the fair value, which is calculated using the same method as our service based stock options and RSUs described above. We then assess whether it is probable that the individual performance targets would be achieved. If assessed as probable, compensation expense will be recorded for these awards over the estimated performance period. At each reporting period, we will reassess the probability of achieving the performance targets and the performance period required to meet those targets. The estimation of whether the performance targets will be achieved and of the performance period required to achieve the targets requires judgment, and to the extent actual results or updated estimates differ from our current estimates, the cumulative effect on current and prior periods of those changes will be recorded in the period estimates are revised, or the change in estimate will be applied prospectively depending on whether the change affects the estimate of total compensation cost to be recognized or merely affects the period over which compensation cost is to be recognized. The ultimate number of shares issued and the related compensation expense recognized will be based on a comparison of the final performance metrics to the specified targets.
	Estimates of fair value are not intended to predict actual future events or the value ultimately realized by employees who receive these awards, and subsequent events are not indicative of the reasonableness of our original estimates of fair value. We use historical data to estimate pre-vesting stock option and RSU forfeitures and record share-based compensation expense only for those awards that are expected to vest. Changes in estimated forfeitures are recognized through a cumulative catch-up adjustment in the period of change which also impacts the amount of stock compensation expense to be recognized in future periods.
Deferred Merchant Payables	Deferred Merchant Payables
	We receive cash from travelers at the time of booking related to our vacation rental, attractions and transaction-based businesses and we record these amounts, net of commissions, on our consolidated balance sheets as deferred merchant payables. We pay the hotel, destination activity operators or vacation rental owners after the travelers’ use and subsequent billing from the hotel, attraction provider or vacation rental owners. Therefore, we receive cash from the traveler prior to paying the hotel, destination activity operator or vacation rental owners, and this operating cycle represents a working capital source or use of cash to us. As long as these businesses grow, we expect that changes in working capital related to these transactions, depending on timing of payments and seasonality, will continue to impact operating cash flows. Our deferred merchant payables balance was $93 million and $30 million for the years ended December 31, 2014 and 2013, respectively. A payable balance of $76 million was acquired during the year ended December 31, 2014, primarily related to our Viator acquisition (see “Note 3— Acquisitions”) and therefore is included within investing activities in our consolidated statement of cash flows.
Credit Risk and Concentrations	Credit Risk and Concentrations
	Financial instruments, which potentially subject us to concentration of credit risk, consist primarily of cash and cash equivalents, corporate debt securities, foreign exchange contracts, accounts receivable and customer concentrations. We maintain some cash and cash equivalents balances with financial institutions that are in excess of Federal Deposit Insurance Corporation insurance limits. Our cash and cash equivalents are primarily composed of prime institutional money market funds as well as bank account balances primarily denominated in U.S. dollars, Euros, British pound sterling, Chinese renminbi, Australian dollars and Singapore dollars. We invest in highly-rated corporate debt securities, and our investment policy limits the amount of credit exposure to any one issuer, industry group and currency. Our credit risk related to corporate debt securities is also mitigated by the relatively short maturity period required by our investment policy. Foreign exchange contracts are transacted with various international financial institutions with high credit standing.
	Our business is also subject to certain risks due to concentrations related to dependence on our relationships with our customers. For the years ended December 31, 2014, 2013 and 2012 our two most significant advertising partners, Expedia and Priceline, each accounted for more than 10% of our consolidated revenue and combined accounted for 46%, 47% and 48% of our consolidated revenue, respectively. This concentration of revenue is recorded in our Hotel segment for these reporting periods. As of December 31, 2014 and 2013, Expedia accounted for 15% and 14%, respectively, of our total accounts receivable. Our overall credit risk related to accounts receivable is also mitigated by the relatively short collection period.
Contingent Liabilities	Contingent Liabilities
	Periodically, we review the status of all significant outstanding matters to assess any potential financial exposure. When (i) it is probable that an asset has been impaired or a liability has been incurred and (ii) the amount of the loss can be reasonably estimated, we record the estimated loss in our consolidated statements of operations. We provide disclosure in the notes to the consolidated financial statements for loss contingencies that do not meet both these conditions if there is a reasonable possibility that a loss may have been incurred that would be material to the financial statements. Significant judgment is required to determine the probability that a liability has been incurred and whether such liability is reasonably estimable. We base accruals made on the best information available at the time which can be highly subjective. The final outcome of these matters could vary significantly from the amounts included in the accompanying consolidated financial statements.
Comprehensive Income (Loss)	Comprehensive Income (Loss)
	Comprehensive income (loss) currently consists of net income, cumulative foreign currency translation adjustments, and unrealized gains and losses on available-for-sale securities, net of tax.
Basic Earnings Per Share	Basic Earnings Per Share
	We compute basic earnings per share (“Basic EPS”) by dividing net income attributable to TripAdvisor by the weighted average number of common shares outstanding during the period. We compute the weighted average number of common shares outstanding during the reporting period using the total of common stock and Class B common stock outstanding as of the last day of the previous year end reporting period plus the weighted average of any additional shares issued and outstanding less the weighted average of any treasury shares repurchased during the reporting period.
	Diluted Earnings Per Share
	We compute diluted earnings per share (“Diluted EPS”) by dividing net income attributable to TripAdvisor by the sum of the weighted average number of common and common equivalent shares outstanding during the period. We computed the weighted average number of common and common equivalent shares outstanding during the period using the sum of (i) the number of shares of common stock and Class B common stock used in the basic earnings per share calculation as indicated above, and (ii) if dilutive, the incremental weighted average common stock that we would issue upon the assumed exercise of outstanding common equivalent shares related to stock options and the vesting of restricted stock units using the treasury stock method, and (iii) if dilutive, performance based awards based on the number of shares that would be issuable as of the end of the reporting period assuming the end of the reporting period was also the end of the contingency period.
	Under the treasury stock method, the assumed proceeds calculation includes the actual proceeds to be received from the employee upon exercise, the average unrecognized compensation cost during the period and any tax benefits credited upon exercise to additional paid-in-capital. The treasury stock method assumes that a company uses the proceeds from the exercise of an award to repurchase common stock at the average market price for the period. Windfall tax benefits created upon the exercise of an award would be added to assumed proceeds, while shortfalls charged to additional paid-in-capital would be deducted from assumed proceeds. Any shortfalls not covered by the windfall tax pool would be charged to the income statement and would be excluded from the calculation of assumed proceeds, if any.
	Below is a reconciliation of the weighted average number of shares of common stock outstanding in calculating Diluted EPS (shares in thousands and dollars in millions, except per share amounts) for the periods presented:
			Year ended December 31,
			2014		2013			2012
	Numerator:
	Net income		$	226	$	205		$	194
	Denominator:
	Weighted average shares used to compute			142,721		142,854			139,462
	Basic EPS
	Weighted average effect of dilutive
	securities:
	Stock options			2,734		2,131			1,207
	RSUs			345		278			161
	Stock warrants			-		-			511
	Weighted average shares used to compute			145,800		145,263			141,341
	Diluted EPS
	Basic EPS		$	1.58	$	1.44		$	1.39
	Diluted EPS		$	1.55	$	1.41		$	1.37
	The following potential common shares related to stock options and RSUs were excluded from the calculation of Diluted EPS because their effect would have been anti-dilutive for the periods presented:
			Year ended December 31,
			2014(1)		2013(2)			2012(3)
	Stock options			1,450		2,244			3,944
	RSUs			191		27			21
	Total			1,641		2,271			3,965
	-1	These totals do not include 66,666 performance based options and 44,000 performance based RSUs representing the right to acquire 110,666 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
	-2	These totals do not include 155,000 performance based options and 44,000 performance based RSUs representing the right to acquire 199,000 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
	-3	These totals do not include 110,000 performance based options and 200,000 performance based RSUs representing the right to acquire 310,000 shares of common stock, respectively, for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
	The earnings per share amounts are the same for common stock and Class B common stock because the holders of each class are legally entitled to equal per share distributions whether through dividends or in liquidation.
New Accounting Pronouncements Not Yet Adopted	New Accounting Pronouncements Not Yet Adopted
	Revenue From Contracts With Customers
	In May 2014, the FASB issued new accounting guidance on revenue from contracts with customers.  The new guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The updated guidance will replace most existing revenue recognition guidance in GAAP when it becomes effective and permits the use of either a retrospective or cumulative effect transition method. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016.  We have not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements
	Pushdown Accounting
	In November 2014, the FASB issued new accounting guidance that provides companies with the option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. The acquired entity may elect the option to apply pushdown accounting in the reporting period in which the change-in-control event occurs. If pushdown accounting is not applied in the reporting period in which the change-in-control event occurs, an acquired entity will have the option to elect to apply pushdown accounting in a subsequent reporting period as a change in accounting principle under GAAP. If pushdown accounting is applied to an individual change-in-control event, that election is irrevocable. This guidance also requires an acquired entity that elects the option to apply pushdown accounting in its separate financial statements to disclose information in the current reporting period that enables users of financial statements to evaluate the effect of pushdown accounting. We have adopted this guidance effective November 18, 2014, as the amendments are effective upon issuance. The adoption of this new guidance did not have any impact on our consolidated financial statements and related disclosures.
	Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
	In July 2013, the FASB issued new accounting guidance on the presentation of unrecognized tax benefits. The new guidance requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows: to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use the deferred tax asset for such purpose, then the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This guidance was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2013, with early adoption permitted. Accordingly, we adopted these presentation requirements during the first quarter of 2014. The adoption of this new guidance did not have a material impact on our consolidated financial statements and related disclosures.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Changes in the Allowance for Doubtful Accounts	The following table presents the changes in the allowance for doubtful accounts for the periods presented:
			December 31,
			2014		2013			2012
			(in millions)
	Allowance for doubtful accounts:
	Balance, beginning of period		$	3	$	3		$	5
	Charges (recoveries) to earnings			3		1			(1	)
	Write-offs, net of recoveries and other adjustments			1		(1	)		(1	)
	Balance, end of period		$	7	$	3		$	3
Reconciliation of Weighted Average Number of Shares of Common Stock Outstanding	Below is a reconciliation of the weighted average number of shares of common stock outstanding in calculating Diluted EPS (shares in thousands and dollars in millions, except per share amounts) for the periods presented:
			Year ended December 31,
			2014		2013			2012
	Numerator:
	Net income		$	226	$	205		$	194
	Denominator:
	Weighted average shares used to compute			142,721		142,854			139,462
	Basic EPS
	Weighted average effect of dilutive
	securities:
	Stock options			2,734		2,131			1,207
	RSUs			345		278			161
	Stock warrants			-		-			511
	Weighted average shares used to compute			145,800		145,263			141,341
	Diluted EPS
	Basic EPS		$	1.58	$	1.44		$	1.39
	Diluted EPS		$	1.55	$	1.41		$	1.37
Common Shares Related to Stock Options, Stock Warrants and RSUs Excluded from Calculated Diluted EPS	The following potential common shares related to stock options and RSUs were excluded from the calculation of Diluted EPS because their effect would have been anti-dilutive for the periods presented:
			Year ended December 31,
			2014(1)		2013(2)			2012(3)
	Stock options			1,450		2,244			3,944
	RSUs			191		27			21
	Total			1,641		2,271			3,965
	-1	These totals do not include 66,666 performance based options and 44,000 performance based RSUs representing the right to acquire 110,666 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
	-2	These totals do not include 155,000 performance based options and 44,000 performance based RSUs representing the right to acquire 199,000 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
	-3	These totals do not include 110,000 performance based options and 200,000 performance based RSUs representing the right to acquire 310,000 shares of common stock, respectively, for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Summary of Purchase Price Allocation Initially Recorded on Consolidated Balance Sheet for All Acquisitions	The following table presents the purchase price allocations initially recorded on our consolidated balance sheet for all 2014 acquisitions (in millions):
			Total
	Goodwill (1)		$	253
	Intangible assets (2)			194
	Net tangible assets (liabilities) (3)			(7	)
	Deferred tax liabilities, net			(40	)
	Total purchase price consideration (4)		$	400
	-1	Goodwill in the amount of $5 million is expected to be deductible for tax purposes.
	-2	Identifiable definite-lived intangible assets acquired during 2014 were comprised of trade names of $44 million with a weighted average life of 10.0 years, customer lists and supplier relationships of $82 million with a weighted average life of 7.2 years, subscriber relationships of $25 million with a weighted average life of 6.0 years and developed technology and other of $43 million with a weighted average life of 4.9 years. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2014 was 7.2 years, and will be amortized on a straight-line basis over their estimated useful lives from acquisition date.
	-3	Includes assets acquired, including cash of $62 million and accounts receivable of $25 million and liabilities assumed, including deferred merchant payables of $76 million, accrued expenses and other current liabilities of $15 million and deferred revenue of $5 million which reflect their respective fair values at acquisition date.
	-4	Subject to adjustment based on (i) final working capital adjustment calculations to be determined for Restopolis and Iens, and (ii) indemnification obligations for general representations and warranties of the acquired company stockholders.
2013 Acquisitions
Business Acquisition [Line Items]
Summary of Purchase Price Allocation Initially Recorded on Consolidated Balance Sheet for All Acquisitions	The following table presents the purchase price allocation recorded on our consolidated balance sheet at fair value for all 2013 acquisitions (in millions):
			Total
	Goodwill (1)		$	30
	Intangible assets (2)			19
	Net liabilities assumed (3)			(10	)
	Deferred tax assets			1
	Total purchase price consideration (4)		$	40
	-1	Goodwill in the amount of $14 million is expected to be deductible for tax purposes.
	-2	Identifiable definite-lived intangible assets acquired during 2013 were comprised of trade names of $8 million, subscriber relationships of $8 million, and developed technology and other of $3 million. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2013 was 8.0 years, which is being amortized on a straight-line basis over their estimated useful lives from acquisition date.
	-3	Includes assets acquired, including cash of $3 million and accounts receivable of $2 million and liabilities assumed, including accounts payables of $11 million, accrued expenses and other current liabilities of $1 million and deferred revenue of $3 million which reflected their respective fair values at acquisition date.
	-4	Subject to adjustment based on (i) indemnification obligations for general representations and warranties of the acquired company stockholders.

Stock_Based_Awards_and_Other_E1

Stock Based Awards and Other Equity Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Amount of Stock-Based Compensation Related to Stock-Based Awards, Primarily Stock Options and RSUs	The following table presents the amount of stock-based compensation related to stock-based awards, primarily stock options and RSUs, on our consolidated statements of operations during the periods presented:
			Year ended December 31,
			2014			2013			2012
			(in millions)
	Selling and marketing		$	13		$	11		$	5
	Technology and content			27			21			11
	General and administrative			23			17			14
	Total stock-based compensation			63			49			30
	Income tax benefit from stock-based compensation			(24	)		(18	)		(10	)
	Total stock-based compensation, net of tax effect		$	39		$	31		$	20
Summary of Stock Option	A summary of our stock option activity is presented below:
						Weighted			Weighted
						Average			Average
						Exercise			Remaining			Aggregate
			Options			Price Per			Contractual			Intrinsic
			Outstanding			Share			Life			Value
			(in thousands)						(in years)			(in millions)
	Options outstanding at December 31, 2013			9,470			40.18
	Assumed options from acquisition			101			16.36
	Granted			579			95.87
	Exercised (1)			(1,202	)		32.87
	Cancelled or expired			(297	)		45.4
	Options outstanding at December 31, 2014			8,651		$	44.47			5		$	273
	Exercisable as of December 31, 2014			4,080		$	32.05			2.7		$	174
	Vested and expected to vest after December 31, 2014			8,445		$	44.11			4.9		$	269
	-1	Inclusive of 628,010 options, which were not converted into shares due to net share settlement in order to cover the aggregate exercise price and the minimum amount of required employee withholding taxes. Potential shares which had been convertible under stock options that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Incentive Plan and can be reissued by the Company. We began net-share settling the majority of our stock option exercises during the third quarter of 2013. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.
Weighted-Average Assumptions of Estimated Fair Value of Stock Option Grants	The fair value of stock option grants under the 2011 Plan and Viator Plan has been estimated at the date of grant using the Black–Scholes option pricing model with the following weighted average assumptions for the periods presented:
			December 31,
			2014			2013			2012
	Risk free interest rate			1.79	%		1.41	%		1.03	%
	Expected term (in years)			5.8			6.06			6.21
	Expected volatility			44.04	%		50.78	%		53.46	%
	Expected dividend yield		—  %			—  %			—  %
Summary of RSU Activity	The following table presents a summary of our RSU activity:
						Weighted
						Average
						Grant-			Aggregate
			RSUs			Date Fair			Intrinsic
			Outstanding			Value Per Share			Value
			(in thousands)						(in millions)
	Unvested RSUs outstanding as of December 31, 2013			1,135			49.64
	Granted			752			93.36
	Vested and released (1)			(307	)		46.78
	Cancelled			(132	)		67.5
	Unvested RSUs outstanding as of December 31, 2014			1,448		$	71.33		$	108
	-1	Inclusive of 103,641 RSUs withheld to satisfy employee minimum tax withholding requirements due to net share settlement. Potential shares which had been convertible under RSUs that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Plan and can be reissued by the Company. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.
Summary of Unrecognized Compensation Expense, Net of Estimated Forfeitures and Weighted Average Period Remaining	A summary of our remaining unrecognized compensation expense, net of estimated forfeitures, and the weighted average remaining amortization period at December 31, 2014 related to our non-vested stock options and RSU awards is presented below (in millions, except per year information):
			Stock
			Options			RSUs
	Unrecognized compensation expense (net of forfeitures)		$	84		$	70
	Weighted average period remaining (in years)			2.7			2.9

Financial_Instruments_Tables

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Investments All Other Investments [Abstract]
Schedule of Cash, Cash Equivalents and Marketable Securities	The following tables show our cash and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short and long-term marketable securities as of December 31, 2014 and December 31, 2013 (in millions):
			31-Dec-14
											Cash and		Short-Term		Long-Term
			Amortized		Unrealized		Unrealized		Fair		Cash		Marketable		Marketable
			Cost		Gains		Losses		Value		Equivalents		Securities		Securities
	Cash		$	447	$	—	$	—	$	447	$	447	$	—	$	—
	Level 1:
	Money market funds			8		—		—		8		8		—		—
	Level 2:
	U.S. agency securities			38		—		—		38		—		35		3
	Certificates of deposit			8		—		—		8		—		8		—
	Commercial paper			1		—		—		1		—		1		—
	Corporate debt securities			92		—		—		92		—		64		28
	Subtotal			139		—		—		139		—		108		31
	Total		$	594	$	—	$	—	$	594	$	455	$	108	$	31
			31-Dec-13
											Cash and		Short-Term		Long-Term
			Amortized		Unrealized		Unrealized		Fair		Cash		Marketable		Marketable
			Cost		Gains		Losses		Value		Equivalents		Securities		Securities
	Cash		$	195	$	—	$	—	$	195	$	195	$	—	$	—
	Level 1:
	Money market funds			156		—		—		156		156		—		—
	Level 2:
	U.S. agency securities			37		—		—		37		—		14		23
	Certificates of deposit			23		—		—		23		—		16		7
	Commercial paper			5		—		—		5		—		5		—
	Corporate debt securities			254		—		—		254		—		96		158
	Subtotal			319		—		—		319		—		131		188
	Total		$	670	$	—	$	—	$	670	$	351	$	131	$	188
Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments	The following table shows the notional principal amounts of our outstanding derivative instruments that are not designated as hedging instruments for the periods presented:
			December 31,		December 31,
			2014		2013
			(in millions)
	Foreign exchange-forward contracts (1)(2)		$	20	$	5
	-1	Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. Dollar.
	-2	The fair value of our derivatives are not material for all periods presented and are reported as liabilities in accrued and other current liabilities on our consolidated balance sheets. We measure the fair value of our outstanding or unsettled derivatives using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Property and Equipment, Net	Property and equipment consists of the following for the periods presented:
			December 31,			December 31,
			2014			2013
			(in millions)
	Capitalized software and website development		$	104		$	73
	Leasehold improvements			40			22
	Computer equipment			31			21
	Furniture, office equipment and other			11			6
				186			122
	Less: accumulated depreciation			(77	)		(48	)
	Construction in progress (1)			86			8
	Property and equipment, net		$	195		$	82
	-1	We capitalize construction in progress for build-to-suit lease agreements where we are considered the owner, for accounting purposes only, during the construction period.  These amounts represent construction costs to date incurred by the landlord and the Company related to our future corporate headquarters in Needham, MA. During the years ended December 31, 2014 and 2013, we capitalized $52 million and $8 million, respectively, in non-cash construction costs which were incurred by the landlord, with a corresponding liability recorded in other long-term liabilities, and in addition, we capitalized $26 million in normal and structural tenant improvements on our consolidated balance sheet incurred by the Company. Refer to “Note 12 – Commitments and Contingencies,” for additional information on our future corporate headquarters lease.

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in Goodwill	The following table summarizes our goodwill activity by segment for the periods presented:
			TripAdvisor			Hotel			Other			Consolidated
			(in millions)
	Balance as of December 31, 2012		$	472		$	-		$	-		$	472
	Additions (1)			30			-			-			30
	Balance as of December 31, 2013		$	502		$	-		$	-		$	502
	Additions (1)			253			-			-			253
	Other adjustments (2)			(21	)		-			-			(21	)
	Allocation to new segments (3)			(734	)		442			292			-
	Ending balance as of December 31, 2014		$	-		$	442		$	292		$	734
	-1	The additions to goodwill relate to our business acquisitions. See “Note 3— Acquisitions,” for further information.
	-2	Primarily related to impact of changes in foreign exchange rates to goodwill.
	-3	See “Note 16—Segments and Geographic Information” for information on our reporting segment changes in the fourth quarter of 2014.
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination	Intangible assets, which were acquired in business combinations and recorded at fair value on the date of purchase, consist of the following for the periods presented:
			December 31,
				2014			2013
			(in millions)
	Intangible assets with definite lives		$	202		$	36
	Less: accumulated amortization			(18	)		(14	)
	Intangible assets with definite lives, net			184			22
	Intangible assets with indefinite lives			30			30
			$	214		$	52
Components of Intangible Assets with Definite Lives	The following table presents the components of our intangible assets with definite lives for the periods presented:
						December 31, 2014									December 31, 2013
			Weighted Average			Gross						Net			Gross					Net
			Remaining Life			Carrying			Accumulated			Carrying			Carrying		Accumulated			Carrying
			(in years)			Amount			Amortization			Amount			Amount		Amortization			Amount
						(in millions)									(in millions)
	Trade names and trademarks			9.4		$	52		$	(5	)	$	47		$	18	$	(7	)	$	11
	Customer lists and supplier relationships			6.8			77			(5	)		72			-		-			-
	Subscriber relationships			5.5			31			(4	)		27			14		(6	)		8
	Technology and other			4.5			42			(4	)		38			4		(1	)		3
	Total			6.8		$	202		$	(18	)	$	184		$	36	$	(14	)	$	22
Summary of Estimated Future Amortization Expense Related to Intangible Assets with Definite Lives	Refer to “Note 3— Acquisitions” above for a discussion of definite lived intangible assets acquired in business combinations during the years ended December 31, 2014 and 2013.
	Intangible assets with definite lives are amortized on a straight-line basis. The estimated amortization expense for intangible assets with definite lives for each of the next five years, and the expense thereafter, assuming no subsequent impairment of the underlying assets, is expected to be as follows (in millions):
	2015		$	31
	2016			31
	2017			29
	2018			27
	2019			24
	2020 and thereafter			42
	Total		$	184

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Summary of Total Outstanding Borrowings	Total outstanding borrowings under the Credit Agreement consist of the following:
		December 31,		December 31,
		2014		2013
		(in millions)
	Short-Term Debt:
	Term Loan	$	40	$	40
	Total Short-Term Borrowings	$	40	$	40
	Long-Term Debt:
	Term Loan	$	260	$	300
	Total Long-Term Borrowings	$	260	$	300
Schedule of Future Minimum Principal Payment Obligations	The future minimum principal payment obligations due under the Credit Agreement related to our Term Loan is as follows:
		Principal Payments
	December 31,	(in millions)
	2015	$	40
	2016		260
	Total	$	300

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Summary of Our Domestic and Foreign Income Before Income Taxes	The following table presents a summary of our domestic and foreign income before income taxes:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Domestic	$	146		$	129		$	133
	Foreign		176			155			149
	Total	$	322		$	284		$	282
Summary of the Components of Our Provision for Income Taxes	The following table presents a summary of the components of our provision for income taxes:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Current income tax expense:
	Federal	$	93		$	48		$	56
	State		14			9			6
	Foreign		6			17			30
	Current income tax expense		113			74			92
	Deferred income tax (benefit) expense:
	Federal		(12	)		6			(3	)
	State		(1	)		1			—
	Foreign		(4	)		(2	)		(2	)
	Deferred income tax (benefit) expense:		(17	)		5			(5	)
	Provision for income taxes	$	96		$	79		$	87
Summary of Deferred Tax Assets and Deferred Tax Liabilities	Our deferred tax assets and deferred tax liabilities as of December 31, 2014 and 2013 are as follows:
		December 31,
		2014			2013
		(in millions)
	Deferred tax assets:
	Stock-based compensation	$	43		$	30
	Net operating loss carryforwards		34			18
	Provision for accrued expenses		13			7
	Deferred rent		5			—
	Build-to-suit lease		26			—
	Foreign advertising spend		9			—
	Other		5			4
	Total deferred tax assets	$	135		$	59
	Less: valuation allowance		(19	)		(13	)
	Net deferred tax assets	$	116		$	46
	Deferred tax liabilities:
	Intangible assets	$	(88	)	$	(32	)
	Property and equipment		(25	)		(18	)
	Prepaid expenses		(4	)		(2	)
	Lease financing obligation		(26	)		—
	Other		(1	)		(2	)
	Total deferred tax liabilities	$	(144	)	$	(54	)
	Net deferred tax liability	$	(28	)	$	(8	)
Reconciliation of the Provision for Income Taxes	A reconciliation of the provision for income taxes to the amounts computed by applying the statutory federal income tax rate to income before income taxes is as follows:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Income tax expense at the federal statutory rate of 35%	$	113		$	100		$	99
	Foreign rate differential		(49	)		(41	)		(25	)
	State income taxes, net of effect of federal tax benefit		13			8			5
	Unrecognized tax benefits and related interest		14			9			5
	Non-deductible transaction costs		1			—			—
	Change in valuation allowance		5			2			2
	Other, net		(1	)		1			1
	Provision for income taxes	$	96		$	79		$	87
Reconciliation of the Beginning and Ending Amount of Gross Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of gross unrecognized tax benefits (excluding interest and penalties) is as follows:
		December 31,
		2014			2013			2012
		(in millions)
	Balance, beginning of year	$	36		$	24		$	13
	Increases to tax positions related to the current year		13			12			12
	Increases to tax positions related to the prior year		18			4			—
	Reductions due to lapsed statute of limitations		—			—			—
	Decreases to tax positions related to the prior year		—			(4	)		—
	Settlements during current year		—			—			(1	)
	Balance, end of year	$	67		$	36		$	24

Accrued_Expenses_and_Other_Cur1

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Payables And Accruals [Abstract]
Details of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following for the periods presented:
			December 31,		December 31,
			2014		2013
			(in millions)
	Accrued salary, bonus, and related benefits		$	41	$	35
	Accrued marketing costs			24		22
	Accrued charitable foundation payments (1)			9		7
	Other			40		22
	Total accrued expenses and other current liabilities		$	114	$	86
	-1	See “Note 12— Commitments and Contingencies” for information regarding our charitable foundation.

Other_LongTerm_Liabilities_Tab

Other Long-Term Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Other Liabilities Noncurrent [Abstract]
Schedule of Other Long-Term Liabilities	Other long-term liabilities consisted of the following for the periods presented:
			December 31,		December 31,
			2014		2013
			(in millions)
	Unrecognized tax benefits (1)		$	68	$	38
	Construction liabilities (2)			67		8
	Other (3)			19		6
	Total other long-term liabilities		$	154	$	52
	-1	See “Note 9—Income Taxes” for additional information on our unrecognized tax benefits. Amount includes accrued interest related to this liability.
	-2	We capitalize construction in progress and record a corresponding long-term liability for build-to-suit lease agreements where we are considered the owner during the construction period for accounting purposes only.  Refer to “Note 12 – Commitments and Contingencies,” for additional information on our future corporate headquarters lease.
	-3	Amounts primarily consist of long term deferred rent balances related to operating leases for office space.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Material Commitments and Obligations	The following table summarizes our material commitments and obligations as of December 31, 2014 and excludes amounts already recorded on the consolidated balance sheet:
					By Period
			Total		Less than		1 to 3 years		3 to 5 years		More than
					1 year						5 years
			(in millions)
	Operating leases (1)		$	114	$	19	$	27	$	26	$	42
	Build to suit lease obligation (2)			143		1		18		18		106
	Expected interest payments on Term Loan (3)			9		5		4		—		—
	Total (4)(5)(6)(7)		$	266	$	25	$	49	$	44	$	148
	-1	Estimated future minimum rental payments under operating leases with non-cancelable lease terms.
	-2	Estimated future minimum rental payments for our future corporate headquarters in Needham, MA.
	-3	The amounts included as expected interest payments on the Term Loan in this table are based on the current effective interest rate and payment terms as of December 31, 2014, but, could change significantly in the future. Amounts assume that our existing debt is repaid at maturity and do not assume additional borrowings or refinancings of existing debt. Refer to “Note 8— Debt” for additional information, including principal payments expected to be paid over the next two years, on our Term Loan.
	-4	Excluded from the table was $68 million of unrecognized tax benefits, including accrued interest, that we have recorded in other long-term liabilities for which we cannot make a reasonably reliable estimate of the amount and period of payment. We estimate that approximately $1 million will be paid within the next twelve months.
	-5	Excluded from the table is our obligation to fund a charitable foundation. The Board of Directors of the charitable foundation is currently comprised of Stephen Kaufer- President and Chief Executive Officer, Julie M.B. Bradley-Chief Financial Officer and Seth J. Kalvert- Senior Vice President, General Counsel and Secretary. Our obligation was calculated at 2.0% of OIBA in 2014. For a discussion regarding OIBA see “Note 16— Segment and Geographic Information” in the notes to the consolidated financial statements. This future commitment has been excluded from the table above.
	-6	Excludes spending on anticipated leasehold improvements on our Needham, Massachusetts lease, including design, development, construction costs, and the purchase and installation of equipment, net of related landlord incentives, which we estimate will be in the range of $25-$30 million primarily incurred during the first six months of 2015.
	-7	Excludes current liabilities already recorded on the consolidated balance sheet at December 31, 2014, as these liabilities are expected to be paid within one year.

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Accumulated Other Comprehensive Loss Primarily Comprised of Accumulated Foreign Currency Translation Adjustments	Accumulated other comprehensive loss is primarily comprised of accumulated foreign currency translation adjustments, as follows for the periods presented:
			December 31,			December 31,
			2014			2013
			(In millions)
	Cumulative foreign currency translation adjustments (1)		$	(31	)	$	—
	Total accumulated other comprehensive loss		$	(31	)	$	—
	-1	We consider our foreign subsidiary earnings indefinitely reinvested; therefore; deferred taxes are not provided on foreign currency translation adjustments.

Segment_and_Geographic_Informa1

Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Summary of Segment Information	The following tables present our segment information for the years ended December 31, 2014, 2013 and 2012.
			Year ended December 31, 2014
			Hotel			Other			Corporate and			Total
									unallocated
			(in millions)
	Revenue		$	1,135		$	111		$	—		$	1,246
	Adjusted EBITDA (1)			472			(4	)		—			468
	Depreciation			—			—			(47	)		(47	)
	Amortization of intangible assets			—			—			(18	)		(18	)
	Stock-based compensation			—			—			(63	)		(63	)
	Operating income (loss)		$	472		$	(4	)	$	(128	)		340
	Other expense, net												(18	)
	Income before income taxes												322
	Provision for income taxes												(96	)
	Net income												226
			Year ended December 31, 2013
			Hotel			Other			Corporate and			Total
									unallocated
			(in millions)
	Revenue		$	899		$	46		$	—		$	945
	Adjusted EBITDA (1)			384			(5	)		—			379
	Depreciation			—			—			(30	)		(30	)
	Amortization of intangible assets			—			—			(6	)		(6	)
	Stock-based compensation			—			—			(49	)		(49	)
	Operating income (loss)		$	384		$	(5	)	$	(85	)		294
	Other expense, net												(10	)
	Income before income taxes												284
	Provision for income taxes												(79	)
	Net income												205
			Year ended December 31, 2012
			Hotel			Other			Corporate and			Total
									unallocated
			(in millions)
	Revenue		$	732		$	31		$	—		$	763
	Adjusted EBITDA (1)			349			3			—			352
	Depreciation			—			—			(20	)		(20	)
	Amortization of intangible assets			—			—			(6	)		(6	)
	Stock-based compensation			—			—			(30	)		(30	)
	Operating income (loss)		$	349		$	3		$	(56	)		296
	Other expense, net												(14	)
	Income before income taxes												282
	Provision for income taxes												(87	)
	Net income												195
	-1	Includes allocated general and administrative expenses in our Hotel segment of $87 million, $72 million and $56 million; and in our Other segment of $18 million, $9 million and $6 million for the years ended December 31, 2014, 2013 and 2012, respectively.
Reconciliation of Adjusted EBITDA to Net Income	The following table is a reconciliation of our Adjusted EBITDA to net income, the most directly comparable financial measure calculated and presented in accordance with GAAP, for the periods presented:
			Year ended December 31,
			2014			2013			2012
			(in millions)
	Adjusted EBITDA		$	468		$	379		$	352
	Depreciation (1)			(47	)		(30	)		(20	)
	OIBA (2)			421			349			332
	Amortization of intangible assets			(18	)		(6	)		(6	)
	Stock-based compensation			(63	)		(49	)		(30	)
	Other expense, net			(18	)		(10	)		(14	)
	Provision for income taxes			(96	)		(79	)		(87	)
	Net income		$	226		$	205		$	195
	-1	Includes amortization of internal use software and website development costs.
	-2	We define OIBA as net income (loss) plus: (1) provision for income taxes; (2) other income (expense), net; (3) stock-based compensation; (4) amortization of intangible assets; and (5) non-recurring expenses. This operating metric is only used by our management to calculate our annual obligation for our charitable foundation. Refer to “Note 12— Commitments and Contingencies” for a discussion of our charitable foundation.
Summary of Total Revenue by Product	The following table presents revenue by product for the periods presented:
			Year ended December 31,
			2014			2013			2012
			(in millions)
	Click-based advertising		$	870		$	696		$	588
	Display-based advertising			140			119			94
	Subscription, transaction and other			236			130			81
	Total revenue		$	1,246		$	945		$	763
Summary of Revenue by Geographic Area	The following table presents revenue by geographic area, the United States, the United Kingdom and all other countries, based on the geographic location of our websites for the periods presented:
			Year ended December 31,
			2014			2013			2012
			(in millions)
	Revenue
	United States		$	593		$	463		$	386
	United Kingdom			191			141			110
	All other countries			462			341			267
			$	1,246		$	945		$	763
Property and Equipment, Net	The following table presents property and equipment, net for the United States and all other countries based on the geographic location of the assets for the periods presented:
			December 31,
			2014			2013
			(in millions)
	Property and equipment, net
	United States		$	170		$	67
	All other countries			25			15
			$	195		$	82

Interest_Income_and_Other_Net_

Interest Income and Other, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Interest And Other Income [Abstract]
Schedule of Interest Income and Other, Net	The following table presents the detail of interest income and other, net, for the periods presented:
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Net loss, realized and unrealized, on foreign exchange and	$	(10	)	$	(2	)	$	(3	)
	foreign currency derivative contracts and other, net
	Interest income		1			2			-
	Total interest income and other, net	$	(9	)	$	-		$	(3	)

Quarterly_Financial_Informatio1

Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The following table presents selected unaudited financial information for the eight quarters in the period ended December 31, 2014. The results for any quarter are not necessarily indicative of future quarterly results and, accordingly, period to period comparisons should not be relied upon as an indication of future performance.
		Three Months Ended
		March 31		June 30		September 30		December 31
		(in millions)
	Year ended December 31, 2014
	Revenue	$	281	$	323	$	354	$	288
	Operating income		96		100		84		60
	Net income		68		68		54		36
	Net income attributable to TripAdvisor, Inc.		68		68		54		36
	Basic earnings per share	$	0.48	$	0.48	$	0.38	$	0.25
	Diluted earnings per share	$	0.47	$	0.47	$	0.37	$	0.25
	Year ended December 31, 2013
	Revenue	$	230	$	247	$	255	$	213
	Operating income		88		94		84		28
	Net income		62		67		56		20
	Net income attributable to TripAdvisor, Inc.		62		67		56		20
	Basic earnings per share	$	0.44	$	0.47	$	0.39	$	0.14
	Diluted earnings per share	$	0.43	$	0.46	$	0.38	$	0.14

Organization_and_Business_Desc1

Organization and Business Description - Additional Information (Detail)	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2011	Dec. 11, 2012	Dec. 31, 2013
	Segment	Company
	Country
	Brand
Description Of Business And Basis Of Presentation [Line Items]
Number of separate independent public companies		2
Number of countries with localized versions of website	45
Number of other media brands with websites	24
Number of reportable segment	2
Other Segment
Description Of Business And Basis Of Presentation [Line Items]
Number of operating segments	3
Class B Common Stock
Description Of Business And Basis Of Presentation [Line Items]
Right to voting	10 votes per share
Vote per common stock share	10
Liberty
Description Of Business And Basis Of Presentation [Line Items]
Common stock purchased by Liberty			4,799,848
Beneficially ownership of shares of common stock			18,159,752
Percentage of interest held by related party	100.00%			100.00%
Liberty | Class B Common Stock
Description Of Business And Basis Of Presentation [Line Items]
Beneficially ownership of shares of common stock				12,799,999
Beneficially ownership of shares of Common Stock Class B			12,799,999
LTRIP
Description Of Business And Basis Of Presentation [Line Items]
Beneficially ownership of shares of common stock	18,159,752
Percentage taken from outstanding shares of common stock	14.00%
Percentage of beneficially ownership of shares of common stock	21.70%
Right to voting	one vote per share
Vote per common stock share	1
Beneficially ownership of equity securities	56.60%
LTRIP | Class B Common Stock
Description Of Business And Basis Of Presentation [Line Items]
Beneficially ownership of shares of common stock	12,799,999
Percentage taken from outstanding shares of common stock	100.00%
Percentage taken from outstanding shares of Class B Common Stock	100.00%
Right to voting	Ten votes per share
Vote per common stock share	10

Significant_Accounting_Policie3

Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Accounting Policies [Line Items]
Minimum maturity for short term marketable security	90 days
Maximum remaining maturity for short term marketable security	12 months
Maximum maturity period for marketable security	3 years
Weighted Average Maturity	18 months
Minimum maturity at purchase date for a short term marketable security	90 days
Accounts receivable due period	30 days
Minimum probability that the fair value of the reporting unit is less than the carrying amount	50.00%
Goodwill, Impairment Loss	$0	$0	$0
Indefinite-lived intangible assets, Impairment Loss	0	0	0
Foreign exchange losses	10,000,000	0	3,000,000
Advertising expense	341,000,000	237,000,000	175,000,000
Prepaid marketing expenses	5,000,000	1,000,000
Prepaid Expense, Current	5,000,000
Deferred merchant payables	93,000,000	30,000,000
Payable balance acquired with business acquisition	76,000,000
Stock Options
Schedule Of Accounting Policies [Line Items]
Stock options vest period	4 years
Restricted Stock Units
Schedule Of Accounting Policies [Line Items]
Stock options vest period	4 years
Minimum
Schedule Of Accounting Policies [Line Items]
Depreciation over the estimated useful lives of the assets	3 years
Amortized estimated useful lives of Intangible assets	2 years
Maximum
Schedule Of Accounting Policies [Line Items]
Depreciation over the estimated useful lives of the assets	5 years
Amortized estimated useful lives of Intangible assets	12 years
Expedia | Reclassification of Operating Cash Flow
Schedule Of Accounting Policies [Line Items]
Prior Period Reclassification Adjustment		-8,000,000	17,000,000
Expedia | Reclassification of Revenue
Schedule Of Accounting Policies [Line Items]
Prior Period Reclassification Adjustment		217,000,000	204,000,000
Expedia | Reclassification of Receivables
Schedule Of Accounting Policies [Line Items]
Prior Period Reclassification Adjustment		($16,000,000)
Customer Concentration Risk | Sales | Expedia
Schedule Of Accounting Policies [Line Items]
Customer concentration risk	10.00%	10.00%	10.00%
Customer Concentration Risk | Sales | Expedia and Priceline
Schedule Of Accounting Policies [Line Items]
Customer concentration risk	46.00%	47.00%	48.00%
Customer Concentration Risk | Sales | Priceline
Schedule Of Accounting Policies [Line Items]
Customer concentration risk	10.00%	10.00%	10.00%
Credit Concentration Risk | Accounts Receivable | Expedia
Schedule Of Accounting Policies [Line Items]
Customer concentration risk	15.00%	14.00%

Significant_Accounting_Policie4

Significant Accounting Policies - Summary of Changes in the Allowance for Doubtful Accounts (Detail) (Allowance for Doubtful Accounts, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance, beginning of period	$3	$3	$5
Charges (recoveries) to earnings	3	1	-1
Write-offs, net of recoveries and other adjustments	1	-1	-1
Balance, end of period	$7	$3	$3

Significant_Accounting_Policie5

Significant Accounting Policies - Reconciliation of Weighted Average Number of Shares of Common Stock Outstanding In Calculating EPS (Detail) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income	$36	$54	$68	$68	$20	$56	$67	$62	$226	$205	$194
Denominator:
Basic									142,721	142,854	139,462
Weighted average effect of dilutive securities:
Stock options									2,734	2,131	1,207
RSUs									345	278	161
Stock warrants											511
Weighted average shares used to compute Diluted EPS									145,800	145,263	141,341
Basic	$0.25	$0.38	$0.48	$0.48	$0.14	$0.39	$0.47	$0.44	$1.58	$1.44	$1.39
Diluted	$0.25	$0.37	$0.47	$0.47	$0.14	$0.38	$0.46	$0.43	$1.55	$1.41	$1.37

Significant_Accounting_Policie6

Significant Accounting Policies - Common Shares Related to Stock Options, Stock Warrants and RSUs Excluded from Calculated Diluted EPS (Detail)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	1,641,000	[1]	2,271,000	[2]	3,965,000	[3]
Stock Option
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	1,450,000	[1]	2,244,000	[2]	3,944,000	[3]
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	191,000	[1]	27,000	[2]	21,000	[3]
[1]	These totals do not include 66,666 performance based options and 44,000 performance based RSUs representing the right to acquire 110,666 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
[2]	These totals do not include 155,000 performance based options and 44,000 performance based RSUs representing the right to acquire 199,000 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
[3]	These totals do not include 110,000 performance based options and 200,000 performance based RSUs representing the right to acquire 310,000 shares of common stock, respectively, for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.

Significant_Accounting_Policie7

Significant Accounting Policies - Common Shares Related to Stock Options, Stock Warrants and RSUs Excluded from Calculated Diluted EPS (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total Performance based options and restricted stock units, bearing right to acquire common stock	66,666		155,000		110,000
Antidilutive securities excluded from computation of earnings per share, amount	1,641,000	[1]	2,271,000	[2]	3,965,000	[3]
Performance Shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	110,666		199,000		310,000
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	191,000	[1]	27,000	[2]	21,000	[3]
Restricted stock units, bearing right to acquire common stock	44,000		44,000		200,000
[1]	These totals do not include 66,666 performance based options and 44,000 performance based RSUs representing the right to acquire 110,666 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
[2]	These totals do not include 155,000 performance based options and 44,000 performance based RSUs representing the right to acquire 199,000 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
[3]	These totals do not include 110,000 performance based options and 200,000 performance based RSUs representing the right to acquire 310,000 shares of common stock, respectively, for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Details) (USD $)	1 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Aug. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
		Property	Business
		Business
Business Acquisition [Line Items]
Cash consideration paid, net of cash acquired		$331	$35	$3
Cash acquired from acquisition		62	3
Noncontrolling interest subsidiary, remaining amount				22
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Acquisition-related costs		4	2
Total purchase price consideration	192	208	40	3
Cash consideration paid	187
Cash consideration paid, net of cash acquired	132	199	35
Cash acquired from acquisition	55	7	3
Stock option issued related to acquisition	100,595
Fair value of stock option issued related to acquisition	5
Unrecognized compensation expense, Stock Options	3
Period of recognition (in years)	3 years
Number of business acquired		6	6
Cash held back on acquisition		2	2
Number of properties featured		14,000
Percentage of consolidated revenue accounted by acquisitions		3.00%
Repayment of cash held back on acquisition		$1
Vacation Home Rentals
Business Acquisition [Line Items]
Business acquisition percentage of outstanding shares of capital stock		100.00%
Date of acquisition		31-May-14
Tripbod
Business Acquisition [Line Items]
Business acquisition percentage of outstanding shares of capital stock		100.00%
Date of acquisition		31-May-14
Lafourchette
Business Acquisition [Line Items]
Business acquisition percentage of outstanding shares of capital stock		100.00%
Date of acquisition		31-May-14
MyTable and Restopolis
Business Acquisition [Line Items]
Business acquisition percentage of outstanding shares of capital stock		100.00%
Date of acquisition		31-Oct-14
Iens
Business Acquisition [Line Items]
Business acquisition percentage of outstanding shares of capital stock		100.00%
Date of acquisition		31-Dec-14
Subsidiary Acquired In 2008
Business Acquisition [Line Items]
Complete Ownership interest				100.00%

Acquisitions_Summary_of_Purcha

Acquisitions - Summary of Purchase Price Allocation Initially Recorded on Consolidated Balance Sheet for all Acquisitions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Business Combinations [Abstract]
Goodwill	$253	[1],[2]	$30	[1],[3]
Intangible assets	194	[4]	19	[5]
Net tangible liabilities	-7	[6]	-10	[7]
Deferred tax liabilities, net	-40
Total purchase price consideration	400	[8]	40	[9]
Deferred tax assets			$1
[1]	The additions to goodwill relate to our business acquisitions. See “Note 3— Acquisitions,” for further information.
[2]	Goodwill in the amount of $5 million is expected to be deductible for tax purposes.
[3]	Goodwill in the amount of $14 million is expected to be deductible for tax purposes.
[4]	Identifiable definite-lived intangible assets acquired during 2014 were comprised of trade names of $44 million with a weighted average life of 10.0 years, customer lists and supplier relationships of $82 million with a weighted average life of 7.2 years, subscriber relationships of $25 million with a weighted average life of 6.0 years and developed technology and other of $43 million with a weighted average life of 4.9 years. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2014 was 7.2 years, and will be amortized on a straight-line basis over their estimated useful lives from acquisition date.
[5]	Identifiable definite-lived intangible assets acquired during 2013 were comprised of trade names of $8 million, subscriber relationships of $8 million, and developed technology and other of $3 million. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2013 was 8.0 years, which is being amortized on a straight-line basis over their estimated useful lives from acquisition date.
[6]	Includes assets acquired, including cash of $62 million and accounts receivable of $25 million and liabilities assumed, including deferred merchant payables of $76 million, accrued expenses and other current liabilities of $15 million and deferred revenue of $5 million which reflect their respective fair values at acquisition date.
[7]	Includes assets acquired, including cash of $3 million and accounts receivable of $2 million and liabilities assumed, including accounts payables of $11 million, accrued expenses and other current liabilities of $1 million and deferred revenue of $3 million which reflected their respective fair values at acquisition date.
[8]	Subject to adjustment based on (i) final working capital adjustment calculations to be determined for Restopolis and Iens, and (ii) indemnification obligations for general representations and warranties of the acquired company stockholders.
[9]	Subject to adjustment based on (i) indemnification obligations for general representations and warranties of the acquired company stockholders.

Acquisitions_Summary_of_Purcha1

Acquisitions - Summary of Purchase Price Allocation Initially Recorded on Consolidated Balance Sheet for all Acquisitions (Parenthetical) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill expected to be deductible for tax purposes	$5		$14
Identifiable definite-lived intangible assets	194	[1]	19	[2]
Weighted average life of identifiable definite-lived intangible assets acquired	7 years 2 months 12 days		8 years
Cash acquired from acquisition	62		3
Assets acquired, accounts receivable	25		2
Liabilities assumed, deferred merchant payables	76		11
Liabilities assumed, accrued expenses	15		1
Liabilities assumed, deferred revenue	5		3
Developed Technology
Business Acquisition [Line Items]
Identifiable definite-lived intangible assets	43
Weighted average life of identifiable definite-lived intangible assets acquired	4 years 10 months 24 days
Trade Names
Business Acquisition [Line Items]
Identifiable definite-lived intangible assets	44		8
Weighted average life of identifiable definite-lived intangible assets acquired	10 years
Customer Lists and Supplier Relationships
Business Acquisition [Line Items]
Identifiable definite-lived intangible assets	82
Weighted average life of identifiable definite-lived intangible assets acquired	7 years 2 months 12 days
Subscriber Relationships
Business Acquisition [Line Items]
Identifiable definite-lived intangible assets	25		8
Weighted average life of identifiable definite-lived intangible assets acquired	6 years
Developed Technology and Other
Business Acquisition [Line Items]
Identifiable definite-lived intangible assets			$3
[1]	Identifiable definite-lived intangible assets acquired during 2014 were comprised of trade names of $44 million with a weighted average life of 10.0 years, customer lists and supplier relationships of $82 million with a weighted average life of 7.2 years, subscriber relationships of $25 million with a weighted average life of 6.0 years and developed technology and other of $43 million with a weighted average life of 4.9 years. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2014 was 7.2 years, and will be amortized on a straight-line basis over their estimated useful lives from acquisition date.
[2]	Identifiable definite-lived intangible assets acquired during 2013 were comprised of trade names of $8 million, subscriber relationships of $8 million, and developed technology and other of $3 million. The overall weighted-average life of the identifiable definite-lived intangible assets acquired in the purchase of the companies during 2013 was 8.0 years, which is being amortized on a straight-line basis over their estimated useful lives from acquisition date.

Stock_Based_Awards_and_Other_E2

Stock Based Awards and Other Equity Instruments - Amount of Stock-Based Compensation Related to Stock-Based Awards, Primarily Stock Options and RSUs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	$63	$49	$30
Income tax benefit from stock-based compensation	-24	-18	-10
Total stock-based compensation, net of tax effect	39	31	20
Selling and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	13	11	5
Technology and Content
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	27	21	11
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation	$23	$17	$14

Stock_Based_Awards_and_Other_E3

Stock Based Awards and Other Equity Instruments - Additional Information (Details) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended
In Millions, except Share data, unless otherwise specified	Jun. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 20, 2011	Sep. 12, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capitalized stock based compensation for website development costs		$8	$5
Common shares registered for issuance under incentive plan					17,500,000
Common stock share issuance under plan	15,000,000
Number of stock options issued		579,000
Total intrinsic value		75	58	25
Total fair value of stock options vested		34	27	10
Expiration date of conversion		7-May-12
Common stock, shares issued		132,315,465	131,537,798
One Tranche of Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$6.48
Common stock share exercisable for each warrant				0.25%
One Tranche of Warrants | Prior to Adjustment
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$12.23
Other Tranche of Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$7.66
Common stock share exercisable for each warrant				0.25%
Other Tranche of Warrants | Prior to Adjustment
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$14.45
Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants Exercised				32,186,791
Common stock, shares issued				7,952,456
Weighted average exercise price of warrants				$27.11
Exercise proceeds received				$215
Cashless warrants exercised				545,454
Weighted average exercise price of cashless warrants				$25.92
Warrants convertible to common shares				0
Warrants | Exercise Price Paid in Cash
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants Exercised				31,641,337
Maximum | Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants convertible into common stock shares at spin-off					8,046,698
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options issued		679,568
Term of stock options, granted		10 years
Stock options vest period		4 years
Closing stock price		$74.66
Grant-date fair value per option		$46.65	$28.30	$20.36
Acquisition Related Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant-date fair value per option		$80.31	$0	$0
2011 Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares registered for issuance under incentive plan					17,400,000
Common shares previously registered for issuance under incentive plan					7,400,000
Share registered under amendment					10,000,000
Common stock share issuance under plan		17,691,977
Stock options vest period		4 years
RSU's issued under incentive plan		752,460
Deferred Compensation Plan for Non Employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares registered for issuance under incentive plan					100,000
2010 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock						100,595

Stock_Based_Awards_and_Other_E4

Stock Based Awards and Other Equity Instruments - Summary of Stock Option (Details) (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014
Options Outstanding
Options Outstanding, Beginning balance	9,470
Options Outstanding, Assumed from acquisition	101
Options Outstanding, Granted	579
Options Outstanding, Exercised	-1,202	[1]
Options Outstanding, Cancelled or expired	-297
Options Outstanding, Ending balance	8,651
Options Outstanding, Exercisable	4,080
Options Outstanding, Vested and expected to vest	8,445
Weighted Average Exercise Price per share
Options Outstanding, Weighted Average Exercise Price, Beginning Balance	$40.18
Options Assumed from acquisition, Weighted Average Exercise Price	$16.36
Options Granted, Weighted Average Exercise Price	$95.87
Options Exercised, Weighted Average Exercise Price	$32.87	[1]
Options Cancelled or expired, Weighted Average Exercise Price	$45.40
Options Outstanding, Weighted Average Exercise Price, Ending balance	$44.47
Options Exercisable, Weighted Average Exercise Price	$32.05
Options Vested and expected to vest, Weighted Average Exercise Price	$44.11
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value
Options Outstanding, Weighted Average Remaining Contractual Life	5 years
Options Exercisable, Weighted Average Remaining Contractual Life	2 years 8 months 12 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life	4 years 10 months 24 days
Options Outstanding, Aggregate Intrinsic Value	$273
Options Exercisable, Aggregate Intrinsic Value	174
Options Vested and expected to vest, Aggregate Intrinsic Value	$269
[1]	Inclusive of 628,010 options, which were not converted into shares due to net share settlement in order to cover the aggregate exercise price and the minimum amount of required employee withholding taxes. Potential shares which had been convertible under stock options that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Incentive Plan and can be reissued by the Company. We began net-share settling the majority of our stock option exercises during the third quarter of 2013. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.

Stock_Based_Awards_and_Other_E5

Stock Based Awards and Other Equity Instruments - Summary of Stock Option (Parenthetical) (Details) (Stock Options)	12 Months Ended
	Dec. 31, 2014
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options non converted into shares due to net share settlement	628,010

Stock_Based_Awards_and_Other_E6

Stock Based Awards and Other Equity Instruments - Weighted-Average Assumptions of Estimated Fair Value of Stock Option Grants (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk free interest rate	1.79%	1.41%	1.03%
Expected term (in years)	5 years 9 months 18 days	6 years 22 days	6 years 2 months 16 days
Expected volatility	44.04%	50.78%	53.46%

Stock_Based_Awards_and_Other_E7

Stock Based Awards and Other Equity Instruments - Summary of RSU Activity (Details) (Restricted Stock Units, USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014
Restricted Stock Units
RSUs outstanding
Unvested RSUs outstanding, Beginning balance	1,135,000
Unvested RSUs, Granted	752,000
Unvested RSUs, Vested and released	-307,000	[1]
Unvested RSUs, Cancelled	-132,000
Unvested RSUs outstanding, Ending balance	1,448,000
Weighted Average Grant-Date Fair Value Per Share
Unvested RSUs outstanding, Weighted Average Grant-Date Fair Value Per Share, Beginning balance	$49.64
Weighted Average Grant-Date Fair Value Per Share, Granted	$93.36
Weighted Average Grant-Date Fair Value Per Share, Vested and released	$46.78	[1]
Weighted Average Grant-Date Fair Value Per Share, Cancelled	$67.50
Unvested RSUs outstanding, Weighted Average Grant-Date Fair Value Per Share, Ending balance	$71.33
Aggregate Intrinsic Value
Unvested RSUs outstanding, Aggregate Intrinsic Value	$108
[1]	Inclusive of 103,641 RSUs withheld to satisfy employee minimum tax withholding requirements due to net share settlement. Potential shares which had been convertible under RSUs that were withheld under net share settlement remain in the authorized but unissued pool under the 2011 Plan and can be reissued by the Company. Total payments for the employees’ tax obligations to the taxing authorities due to net share settlements are reflected as a financing activity within the consolidated statements of cash flows.

Stock_Based_Awards_and_Other_E8

Stock Based Awards and Other Equity Instruments - Summary of RSU Activity (Parenthetical) (Details) (Restricted Stock Units)	12 Months Ended
	Dec. 31, 2014
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs withheld to satisfy minimum tax withholding requirements	103,641

Stock_Based_Awards_and_Other_E9

Stock Based Awards and Other Equity Instruments - Summary of Unrecognized Compensation Expense, Net of Estimated Forfeitures and Weighted Average Period Remaining (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense (net of forfeitures), Stock Options	$84
Period of recognition (in years)	2 years 8 months 12 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period of recognition (in years)	2 years 10 months 24 days
Unrecognized compensation expense (net of forfeitures), RSUs	$70

Financial_Instruments_Schedule

Financial Instruments - Schedule of Cash, Cash Equivalents and Marketable Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$594	$670
Fair Value	594	670
Cash and cash equivalents	455	351	367	183
Short-Term Marketable Securities	108	131
Long-Term Marketable Securities	31	188
Cash	447	195
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents	8	156
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	139	319
Fair Value	139	319
Short-Term Marketable Securities	108	131
Long-Term Marketable Securities	31	188
Level 2 | U.S. Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	38	37
Fair Value	38	37
Short-Term Marketable Securities	35	14
Long-Term Marketable Securities	3	23
Level 2 | Certificates of Deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	8	23
Fair Value	8	23
Short-Term Marketable Securities	8	16
Long-Term Marketable Securities		7
Level 2 | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	1	5
Fair Value	1	5
Short-Term Marketable Securities	1	5
Level 2 | Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	92	254
Fair Value	92	254
Short-Term Marketable Securities	64	96
Long-Term Marketable Securities	$28	$158

Financial_Instruments_Addition

Financial Instruments - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Investments Debt And Equity Securities [Abstract]
Financial instruments including money market funds maturities period	90 days
Maximum maturities period of long-term marketable securities	3 years
Minimum maturities period of long-term marketable securities	1 year
Maximum remaining maturity for short term marketable security	12 months
Minimum maturity for short term marketable security	90 days
Total fair value of marketable securities	$68
Derivative Instruments Not Designated as Hedging Instruments, Description of Terms	Our current forward contracts are not designated as hedges and have current maturities of less than 90 days

Financial_Instruments_Fair_Val

Financial Instruments - Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments (Details) (Not Designated as Hedging Instrument, Foreign Exchange Contract, USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivatives Fair Value [Line Items]
Foreign exchange-forward contracts	$20	[1],[2]	$5	[1],[2]
[1]	Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. Dollar.
[2]	The fair value of our derivatives are not material for all periods presented and are reported as liabilities in accrued and other current liabilities on our consolidated balance sheets. We measure the fair value of our outstanding or unsettled derivatives using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.

Property_and_Equipment_Net_Com

Property and Equipment, Net - Components of Property and Equipment (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Property Plant And Equipment [Line Items]
Property and equipment, gross	$186		$122
Less: accumulated depreciation	-77		-48
Construction in progress	86	[1]	8	[1]
Property and equipment, net	195		82
Capitalized Software and Website Development
Property Plant And Equipment [Line Items]
Property and equipment, gross	104		73
Property and equipment, net	61		46
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	40		22
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	31		21
Furniture, Office Equipment and Other
Property Plant And Equipment [Line Items]
Property and equipment, gross	$11		$6
[1]	We capitalize construction in progress for build-to-suit lease agreements where we are considered the owner, for accounting purposes only, during the construction period.  These amounts represent construction costs to date incurred by the landlord and the Company related to our future corporate headquarters in Needham, MA. During the years ended December 31, 2014 and 2013, we capitalized $52 million and $8 million, respectively, in non-cash construction costs which were incurred by the landlord, with a corresponding liability recorded in other long-term liabilities, and in addition, we capitalized $26 million in normal and structural tenant improvements on our consolidated balance sheet incurred by the Company. Refer to “Note 12 – Commitments and Contingencies,” for additional information on our future corporate headquarters lease. Â

Property_and_Equipment_Net_Com1

Property and Equipment, Net - Components of Property and Equipment (Parenthetical) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Line Items]
Capitalization of construction in-process related to build to suit lease obligation	$52	$8
Other Noncurrent Liabilities
Property Plant And Equipment [Line Items]
Capitalization of construction in-process related to build to suit lease obligation	52	8
Other Noncurrent Assets
Property Plant And Equipment [Line Items]
Normal and structural tenant improvements	$26

Property_and_Equipment_Net_Add

Property and Equipment, Net - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Property Plant And Equipment [Line Items]
Property and equipment, net (Note 6)	$195		$82
Depreciation of property and equipment, including amortization of internal-use software and website development	47	[1]	30	[1]	20	[1]
Capitalized Software and Website Development
Property Plant And Equipment [Line Items]
Property and equipment, net (Note 6)	61		46
Capitalized computer software and website development costs	47		38
Depreciation of property and equipment, including amortization of internal-use software and website development	30		20		13
Property and equipment, dispositions	22
Accumulated depreciation, dispositions	-20
Loss on property and equipment, dispositions	($2)
[1]	Includes amortization of internal use software and website development costs.

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets, Net - Summary of Changes in Goodwill (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Goodwill [Line Items]
Beginning balance	$502		$472
Additions	253	[1],[2]	30	[1],[3]
Foreign exchange translation adjustment	-21	[4]
Ending balance	734		502
Trip Advisor Segment
Goodwill [Line Items]
Beginning balance	502		472
Additions	253	[1]	30	[1]
Foreign exchange translation adjustment	-21	[4]
Allocation to new segments	-734	[5]
Ending balance			502
Hotels Segment
Goodwill [Line Items]
Allocation to new segments	442	[5]
Ending balance	442
Other Segment
Goodwill [Line Items]
Allocation to new segments	292	[5]
Ending balance	$292
[1]	The additions to goodwill relate to our business acquisitions. See “Note 3— Acquisitions,” for further information.
[2]	Goodwill in the amount of $5 million is expected to be deductible for tax purposes.
[3]	Goodwill in the amount of $14 million is expected to be deductible for tax purposes.
[4]	Primarily related to impact of changes in foreign exchange rates to goodwill.
[5]	See “Note 16—Segments and Geographic Information” for information on our reporting segment changes in the fourth quarter of 2014.

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets, Net - Summary of Intangible Assets Acquired in Business Combinations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets with definite lives	$202	$36
Less: accumulated amortization	-18	-14
Intangible assets with definite lives, net	184	22
Intangible assets with indefinite lives	30	30
Intangible assets, net	$214	$52

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets, Net - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$18	$6	$6

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets, Net - Components of Intangible Assets with Definite Lives (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	6 years 9 months 18 days
Gross Carrying Amount	$202	$36
Accumulated Amortization	-18	-14
Intangible assets with definite lives, net	184	22
Trade Names and Trademarks
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	9 years 4 months 24 days
Gross Carrying Amount	52	18
Accumulated Amortization	-5	-7
Intangible assets with definite lives, net	47	11
Customer Lists and Supplier Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	6 years 9 months 18 days
Gross Carrying Amount	77
Accumulated Amortization	-5
Intangible assets with definite lives, net	72
Subscriber Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	4 years 8 months 12 days
Gross Carrying Amount	31	14
Accumulated Amortization	-4	-6
Intangible assets with definite lives, net	27	8
Technology and Other
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	5 years
Gross Carrying Amount	42	4
Accumulated Amortization	-4	-1
Intangible assets with definite lives, net	$38	$3

Goodwill_and_Intangible_Assets6

Goodwill and Intangible Assets, Net - Summary of Estimated Future Amortization Expense Related to Intangible Assets with Definite Lives (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]
2015	$31
2016	31
2017	29
2018	27
2019	24
2020 and thereafter	42
Intangible assets with definite lives, net	$184	$22

Debt_Term_Loan_Facility_Due_Tw

Debt - Term Loan Facility Due Twenty Sixteen and Revolving Credit Facility - Additional Information (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 20, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Principal repayment of term loan		2.50%
Principal payments on long-term debt		$40,000,000	$40,000,000	$20,000,000
Credit facility borrowings (Note 8)		38,000,000	28,000,000
Total interest and commitments fees		9,000,000	10,000,000	11,000,000
Amortization expense		1,000,000	1,000,000	1,000,000
Term Loan and Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing limits	600,000,000
Borrowings, interest rate description		interest at LIBOR plus 150 basis points, or the Eurocurrency Spread, or the alternate base rate (“ABR”) plus 50 basis points
Commitment fee on undrawn amount		0.23%
Borrowings, interest rate basis		1.70%
Term Loan and Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Borrowings interest rate basis point		1.50%
Term Loan and Revolving Credit Facility | Alternate Base Rate
Debt Instrument [Line Items]
Borrowings interest rate basis point		0.50%
Term Loan
Debt Instrument [Line Items]
Term Loan Facility, principal amount	400,000,000
Period of Term Loan Facility	5 years
Borrowings, maturity date	31-Dec-16
Total interest and commitments fees		6,000,000	8,000,000	9,000,000
Deferred financing costs	3,500,000
Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity under Credit Facility	200,000,000
Credit facility, expiration period	5 years
Borrowings, maturity date	31-Dec-16
Credit facility borrowings (Note 8)		0
Letter of Credit
Debt Instrument [Line Items]
Borrowing capacity under Credit Facility		40,000,000
Letters of credit outstanding amount		1,000,000
Borrowings On Same Day Notice
Debt Instrument [Line Items]
Borrowing capacity under Credit Facility		$40,000,000

Debt_Summary_of_Total_Outstand

Debt - Summary of Total Outstanding Borrowings (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Short-Term Debt:
Total Short-Term Borrowings	$40	$40
Long-Term Debt:
Total Long-Term Borrowings	260	300
Term Loan
Short-Term Debt:
Total Short-Term Borrowings	40	40
Long-Term Debt:
Total Long-Term Borrowings	$260	$300

Debt_Schedule_of_Future_Minimu

Debt - Schedule of Future Minimum Principal Payment Obligations (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Debt Disclosure [Abstract]
2015	$40
2016	260
Total	$300

Debt_Chinese_Credit_Facilities

Debt - Chinese Credit Facilities - Additional Information (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	USD ($)	Chinese Credit Facility	Chinese Credit Facility	Chinese Credit Facility-BOA	Chinese Credit Facility-BOA	Chinese Credit Facility-JPM	Chinese Credit Facility-JPM
			USD ($)	USD ($)	USD ($)	CNY	USD ($)	CNY
Debt Instrument [Line Items]
Outstanding borrowings	$38,000,000	$28,000,000	$38,000,000	$28,000,000	$19,000,000		$19,000,000
Borrowing capacity under Credit Facility					$30,000,000	189,000,000	$20,000,000	125,000,000
Period of Term Loan Facility					1 year	1 year	1 year	1 year
Line of credit rate basis					100.00%	100.00%	100.00%	100.00%
Borrowings, interest rate basis					5.60%	5.60%	5.60%	5.60%
Interest rate of Chinese Credit Facility BOA					Chinese Credit Facility—BOA currently bears interest at a 100% of the People’s Bank of China’s base rate which was 5.6% as of December 31, 2014	Chinese Credit Facility—BOA currently bears interest at a 100% of the People’s Bank of China’s base rate which was 5.6% as of December 31, 2014	Chinese Credit Facility—JPM currently bears interest at a 100% of the People’s Bank of China’s base rate which was 5.6% as of December 31, 2014	Chinese Credit Facility—JPM currently bears interest at a 100% of the People’s Bank of China’s base rate which was 5.6% as of December 31, 2014

Income_Taxes_Summary_of_Our_Do

Income Taxes - Summary of Our Domestic and Foreign Income Before Income Taxes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Domestic	$146	$129	$133
Foreign	176	155	149
Income before income taxes	$322	$284	$282

Income_Taxes_Summary_of_the_Co

Income Taxes - Summary of the Components of Our Provision for Income Taxes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax expense:
Federal	$93	$48	$56
State	14	9	6
Foreign	6	17	30
Current income tax expense	113	74	92
Deferred income tax (benefit) expense:
Federal	-12	6	-3
State	-1	1
Foreign	-4	-2	-2
Deferred income tax (benefit) expense:	-17	5	-5
Provision for income taxes	$96	$79	$87

Income_Taxes_Summary_of_Deferr

Income Taxes - Summary of Deferred Tax Assets and Deferred Tax Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Deferred tax assets:
Stock-based compensation	$43	$30
Net operating loss carryforwards	34	18
Provision for accrued expenses	13	7
Deferred rent	5
Build-to-suit lease	26
Foreign advertising spend	9
Other	5	4
Total deferred tax assets	135	59
Less: valuation allowance	-19	-13
Net deferred tax assets	116	46
Deferred tax liabilities:
Intangible assets	-88	-32
Property and equipment	-25	-18
Prepaid expenses	-4	-2
Lease financing obligation	-26
Other	-1	-2
Total deferred tax liabilities	-144	-54
Net deferred tax liability	($28)	($8)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Valuation allowance related to net operating loss carryforwards	$19
Foreign net operating loss carryforwards			6
Undistributed earnings of foreign subsidiaries	630
Effective income tax federal statutory rate	35.00%
Unrecognized tax benefits	67	13	36	24
Unrecognized tax benefits that would impact effective tax rate	65
Unrecognized tax benefits that would impact goodwill	2
Total gross interest and penalties accrued	4		2
Estimated unrecognized tax benefit amount	1
Singapore
Income Taxes [Line Items]
Effective income tax federal statutory rate		5.00%
Singapore's statutory tax rate		17.00%
Tax incentive agreement expiration date	30-Jun-16
Agreement maturity extension period	5 years
Decrease to the 2014 tax provision	6
Increase in Diluted EPS	$0.04
Federal
Income Taxes [Line Items]
Operating loss carryforwards	42
Expiration date of NOLs	Between 2020 and 2033
State
Income Taxes [Line Items]
Operating loss carryforwards	36
Expiration date of NOLs	Between 2020 and 2033
Foreign
Income Taxes [Line Items]
Operating loss carryforwards	$84
Expiration date of NOLs	Between 2020 and 2033

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of the Provision for Income Taxes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense at the federal statutory rate of 35%	$113	$100	$99
Foreign rate differential	-49	-41	-25
State income taxes, net of effect of federal tax benefit	13	8	5
Unrecognized tax benefits and related interest	14	9	5
Non-deductible transaction costs	1
Change in valuation allowance	5	2	2
Other, net	-1	1	1
Provision for income taxes	$96	$79	$87

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of the Provision for Income Taxes (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate	35.00%

Income_Taxes_Reconciliation_of2

Income Taxes - Reconciliation of the Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance, beginning of year	$36	$24	$13
Increases to tax positions related to the current year	13	12	12
Increases to tax positions related to the prior year	18	4
Decreases to tax positions related to the prior year		-4
Settlements during current year			-1
Balance, end of year	$67	$36	$24

Accrued_Expenses_and_Other_Cur2

Accrued Expenses and Other Current Liabilities - Details of Accrued Expenses and Other Current Liabilities (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Payables And Accruals [Abstract]
Accrued salary, bonus, and related benefits	$41		$35
Accrued marketing costs	24		22
Accrued charitable foundation payments	9	[1]	7	[1]
Other	40		22
Total accrued expenses and other current liabilities	$114		$86
[1]	See “Note 12— Commitments and Contingencies” for information regarding our charitable foundation.

Other_LongTerm_Liabilities_Sch

Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Other Liabilities Noncurrent [Abstract]
Unrecognized tax benefits	$68	[1]	$38	[1]
Construction liabilities	67	[2]	8	[2]
Other	19	[3]	6	[3]
Total other long-term liabilities	$154		$52
[1]	See “Note 9—Income Taxes” for additional information on our unrecognized tax benefits. Amount includes accrued interest related to this liability.
[2]	We capitalize construction in progress and record a corresponding long-term liability for build-to-suit lease agreements where we are considered the owner during the construction period for accounting purposes only. Refer to “Note 12 – Commitments and Contingencies,” for additional information on our future corporate headquarters lease.
[3]	Amounts primarily consist of long term deferred rent balances related to operating leases for office space.

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Details) (USD $)	12 Months Ended			1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013
	Location
Commitment And Contingencies [Line Items]
Rental expense	$17	$11	$8
Lease expiration date	1-Dec-30
Leased area				280,000
Aggregate future minimum lease payments, total	114
Aggregate future minimum lease payments in 2015	19
Aggregate future minimum lease payments in 2020 and thereafter	42
Leased location	40
Criteria percentage of damages claims	10.00%
Letter of Credit
Commitment And Contingencies [Line Items]
Letter of credit issued	1
North America And Europe And Asia Pacific
Commitment And Contingencies [Line Items]
Lease expiration date	1-Nov-24
Leased area	470,000
New Corporate Headquarters
Commitment And Contingencies [Line Items]
Initial term of Lease				15 years 7 months
Initial base rent				33
Increase in base rent				34.5
Extended Lease Term				5 years
Aggregate future minimum lease payments, total	143
Aggregate future minimum lease payments in 2015	1
Aggregate future minimum lease payments in 2016	9
Aggregate future minimum lease payments in 2017	9
Aggregate future minimum lease payments in 2018	9
Aggregate future minimum lease payments in 2019	9
Aggregate future minimum lease payments in 2020 and thereafter	106
Security Deposits	$1
Newton, Massachusetts
Commitment And Contingencies [Line Items]
Lease expiration date	1-Apr-15
Headquarters | Newton, Massachusetts
Commitment And Contingencies [Line Items]
Leased area	119,000

Commitments_and_Contingencies_2

Commitments and Contingencies - Material Contractual Obligations, Commercial Commitments and Outstanding Debt (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Commitment And Contingencies [Line Items]
Operating leases, Total	$114
Operating leases, Less than 1 year	19
Operating leases, 1 to 3 years	27
Operating leases, 3 to 5 years	26
Operating leases, More than 5 years	42
Contractual Obligation, Total	266
Contractual Obligation, Less than 1 year	25
Contractual Obligation, 1 to 3 years	49
Contractual Obligation, 3 to 5 years	44
Contractual Obligation, More than 5 years	148
Build to Suit Lease Obligation
Commitment And Contingencies [Line Items]
Contractual Obligation, Total	143
Contractual Obligation, Less than 1 year	1
Contractual Obligation, 1 to 3 years	18
Contractual Obligation, 3 to 5 years	18
Contractual Obligation, More than 5 years	106
Expected Interest Payments on Term Loan
Commitment And Contingencies [Line Items]
Contractual Obligation, Total	9
Contractual Obligation, Less than 1 year	5
Contractual Obligation, 1 to 3 years	$4

Commitments_and_Contingencies_3

Commitments and Contingencies - Material Contractual Obligations, Commercial Commitments and Outstanding Debt (Parenthetical) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Commitment And Contingencies [Line Items]
Unrecognized tax benefits	$68
Estimated future payment of unrecognized tax benefits including accrued interest	1
Percent of OIBA for Charitable Foundation	2.00%
Term Loan
Commitment And Contingencies [Line Items]
Expected principal payments term	2 years
Corporate Lease | Minimum
Commitment And Contingencies [Line Items]
Estimated cost of lease	25
Corporate Lease | Maximum
Commitment And Contingencies [Line Items]
Estimated cost of lease	$30

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Automatic enrollment feature pre-tax	3.00%
Maximum employer contribution	50.00%
Maximum employee contributions percentage to receive 50% matching	6.00%
Employer match, percent	3.00%
Contributions vested with the employees	2 years
Contributions to plans	$5	$5	$3
Director
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Common stock reserved for issuance to non-employee directors	557
Director | 2011 Incentive Plan
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Common stock reserved for issuance to non-employee directors	100,000
Maximum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
No of installments for payments upon termination	Payments upon termination will be made in either one lump sum or up to five annual installments, as elected by the eligible director at the time of the deferral election
Pre-tax basis
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum annual employee contribution, percent	50.00%
After-tax basis
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum annual employee contribution, percent	10.00%

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 15, 2013
	Directors
Schedule Of Capitalization Equity [Line Items]
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares issued	0	0
Common stock, shares authorized	1,600,000,000	1,600,000,000
Common stock, par value	$0.00	$0.00
Percentage of directors elected by common stock holders	25.00%
Number of directors	3
Conversion of Class B common stock	1
Common stock, shares issued	132,315,465	131,537,798
Common stock, shares outstanding	130,121,292	129,417,089
Authorized the repurchase of shares of common stock				250,000,000
Repurchase of common stock, shares	2,120,709
Aggregate cost of shares repurchased, common stock	$145	$145
Remaining authorized share repurchased amount	$105
Dividend declared on common stock	$0	$0	$0
Class B Common Stock
Schedule Of Capitalization Equity [Line Items]
Common stock, shares authorized	400,000,000	400,000,000
Common stock, par value	$0.00	$0.00
Right to voting	10 votes per share
Vote per common share	10
Common stock, shares issued	12,799,999	12,799,999
Common stock, shares outstanding	12,799,999	12,799,999
Common Stock
Schedule Of Capitalization Equity [Line Items]
Common stock, shares authorized	1,600,000,000
Common stock, par value	$0.00
Right to voting	one vote per share
Vote per common share	1

Stockholders_Equity_Accumulate

Stockholders' Equity - Accumulated Other Comprehensive Loss Primarily Comprised of Accumulated Foreign Currency Translation (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Schedule Of Capitalization Equity [Line Items]
Total accumulated other comprehensive loss	($31)
Cumulative Foreign Currency Translation Adjustments
Schedule Of Capitalization Equity [Line Items]
Total accumulated other comprehensive loss	($31)

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Details)	0 Months Ended	12 Months Ended
	Dec. 11, 2012	Dec. 31, 2014	Dec. 31, 2013
Liberty
Related Party Transaction [Line Items]
Common stock purchased by Liberty	4,799,848
Beneficially ownership of shares of common stock	18,159,752
Percentage of interest held by related party		100.00%	100.00%
LTRIP
Related Party Transaction [Line Items]
Beneficially ownership of shares of common stock		18,159,752
Percentage taken from outstanding shares of common stock		14.00%
Percentage of beneficially ownership of shares of common stock		21.70%
Right to voting		one vote per share
Beneficially ownership of equity securities		56.60%
Class B Common Stock
Related Party Transaction [Line Items]
Right to voting		10 votes per share
Class B Common Stock | Liberty
Related Party Transaction [Line Items]
Beneficially ownership of shares of common stock			12,799,999
Class B Common Stock | LTRIP
Related Party Transaction [Line Items]
Beneficially ownership of shares of common stock		12,799,999
Percentage taken from outstanding shares of common stock		100.00%
Right to voting		Ten votes per share
Common Stock
Related Party Transaction [Line Items]
Right to voting		one vote per share
Common Stock | Liberty
Related Party Transaction [Line Items]
Beneficially ownership of shares of common stock			18,159,752

Segment_and_Geographic_Informa2

Segment and Geographic Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2014
	Segment
Segment Reporting Information [Line Items]
Number of reportable segment	2
Other Segment
Segment Reporting Information [Line Items]
Number of operating segments	3

Segment_and_Geographic_Informa3

Segment and Geographic Information - Summary of Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$288	$354	$323	$281	$213	$255	$247	$230	$1,246		$945		$763
Adjusted EBITDA									468	[1]	379	[1]	352	[1]
Depreciation									-47	[2]	-30	[2]	-20	[2]
Amortization of intangible assets									-18		-6		-6
Stock-based compensation									-63		-49		-30
Operating income (loss)	60	84	100	96	28	84	94	88	340		294		296
Other expense, net									-18		-10		-14
Income before income taxes									322		284		282
Provision for income taxes									-96		-79		-87
Net income	36	54	68	68	20	56	67	62	226		205		195
Operating Segments | Hotel
Segment Reporting Information [Line Items]
Revenue									1,135		899		732
Adjusted EBITDA									472	[1]	384	[1]	349	[1]
Operating income (loss)									472		384		349
Operating Segments | Other Segment
Segment Reporting Information [Line Items]
Revenue									111		46		31
Adjusted EBITDA									-4	[1]	-5	[1]	3	[1]
Operating income (loss)									-4		-5		3
Corporate and Unallocated
Segment Reporting Information [Line Items]
Depreciation									-47		-30		-20
Amortization of intangible assets									-18		-6		-6
Stock-based compensation									-63		-49		-30
Operating income (loss)									($128)		($85)		($56)
[1]	Includes allocated general and administrative expenses in our Hotel segment of $87 million, $72 million and $56 million; and in our Other segment of $18 million, $9 million and $6 million for the years ended December 31, 2014, 2013 and 2012, respectively.
[2]	Includes amortization of internal use software and website development costs.

Segment_and_Geographic_Informa4

Segment and Geographic Information - Summary of Segment Information (Parenthetical) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
General and administrative expenses	$128	[1]	$98	[1]	$76	[1]
Hotel
Segment Reporting Information [Line Items]
General and administrative expenses	87		72		56
Other Segment
Segment Reporting Information [Line Items]
General and administrative expenses	$18		$9		$6
[1]	Includes stock-based compensation expense as follows:

Segment_and_Geographic_Informa5

Segment and Geographic Information - Reconciliation of Adjusted EBITDA to Net Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting [Abstract]
Adjusted EBITDA									$468	[1]	$379	[1]	$352	[1]
Depreciation									-47	[2]	-30	[2]	-20	[2]
OIBA									421	[3]	349	[3]	332	[3]
Amortization of intangible assets									-18		-6		-6
Stock-based compensation									-63		-49		-30
Other expense, net									-18		-10		-14
Provision for income taxes									-96		-79		-87
Net income	$36	$54	$68	$68	$20	$56	$67	$62	$226		$205		$195
[1]	Includes allocated general and administrative expenses in our Hotel segment of $87 million, $72 million and $56 million; and in our Other segment of $18 million, $9 million and $6 million for the years ended December 31, 2014, 2013 and 2012, respectively.
[2]	Includes amortization of internal use software and website development costs.
[3]	We define OIBA as net income (loss) plus: (1) provision for income taxes; (2) other income (expense), net; (3) stock-based compensation; (4) amortization of intangible assets; and (5) non-recurring expenses. This operating metric is only used by our management to calculate our annual obligation for our charitable foundation. Refer to “Note 12— Commitments and Contingencies” for a discussion of our charitable foundation.

Segment_and_Geographic_Informa6

Segment and Geographic Information - Summary of Total Revenue by Product (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Total revenue	$288	$354	$323	$281	$213	$255	$247	$230	$1,246	$945	$763
Click-based advertising
Revenue from External Customer [Line Items]
Total revenue									870	696	588
Display-based advertising
Revenue from External Customer [Line Items]
Total revenue									140	119	94
Subscription, transaction and other
Revenue from External Customer [Line Items]
Total revenue									$236	$130	$81

Segment_and_Geographic_Informa7

Segment and Geographic Information - Summary of Revenue by Geographic Area (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$288	$354	$323	$281	$213	$255	$247	$230	$1,246	$945	$763
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue									593	463	386
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue									191	141	110
All Other Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue									$462	$341	$267

Segment_and_Geographic_Informa8

Segment and Geographic Information - Property and Equipment, Net (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$195	$82
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	170	67
All Other Countries
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$25	$15

Interest_Income_and_Other_Net_1

Interest Income and Other, Net - Schedule of Interest Income and Other, Net (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest And Other Income [Abstract]
Net loss, realized and unrealized, on foreign exchange and foreign currency derivative contracts	($10)	($2)	($3)
Interest income	1	2
Total interest income and other, net	($9)		($3)

Quarterly_Financial_Informatio2

Quarterly Financial Information - Summary of Selected Unaudited Financial Information (Detail) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Year ended December 31, 2014
Revenue	$288	$354	$323	$281	$213	$255	$247	$230	$1,246	$945	$763
Operating income	60	84	100	96	28	84	94	88	340	294	296
Net income	36	54	68	68	20	56	67	62	226	205	195
Net income attributable to TripAdvisor, Inc.	$36	$54	$68	$68	$20	$56	$67	$62	$226	$205	$194
Basic earnings per share	$0.25	$0.38	$0.48	$0.48	$0.14	$0.39	$0.47	$0.44	$1.58	$1.44	$1.39
Diluted earnings per share	$0.25	$0.37	$0.47	$0.47	$0.14	$0.38	$0.46	$0.43	$1.55	$1.41	$1.37