Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements present our results of operations, financial position and cash flows on a consolidated basis. The unaudited condensed 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. All inter-company accounts and transactions have been eliminated in consolidation. One of our subsidiaries that operates in China has 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 these 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 activity of these affiliates. Our variable interest entities’ financial results were not material for all periods presented. Investments in entities in which we do not have a controlling financial interest are accounted for under the equity method, the fair value option, as available-for-sale securities or at cost adjusted for observable price changes and impairments, as appropriate. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) and include all normal and recurring adjustments that management of the Company considers necessary for a fair presentation of its financial position and operating results. We prepared the unaudited condensed consolidated financial statements following the requirements of the U.S. Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, we condensed or omitted certain footnotes or other financial information that are normally required by GAAP for annual financial statements. Additionally, certain prior period amounts have been reclassified for comparability with the current period presentation. Our interim unaudited condensed consolidated financial statements are not necessarily indicative of results that may be expected for any other interim period or for the full year. These interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2019, previously filed with the SEC. The unaudited condensed consolidated balance sheet as of December 31, 2019 included herein was derived from the audited consolidated financial statements as of that date, but does not include all disclosures including notes required by GAAP. As of June 30, 2020, Liberty TripAdvisor Holdings, Inc. (“LTRIP”) beneficially owned approximately 18.2 million shares of our common stock and 12.8 million shares of our Class B common stock, which constitute 14.9% 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 23.0% of the outstanding common stock. Because each share of Class B common stock 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 58.6% of our voting power. We had no related party transactions with LTRIP during the three and six months ended June 30, 2020 and 2019, respectively.
Accounting Estimates	Accounting Estimates We use estimates and assumptions in the preparation of our unaudited condensed 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 unaudited condensed 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 unaudited condensed consolidated financial statements include: (i) recognition and recoverability of goodwill, definite-lived intangibles and other long-lived assets; and (ii) accounting for income taxes. The COVID-19 pandemic has created and may continue to create significant uncertainty in macroeconomic conditions, which may cause further business disruptions and adversely impact our results of operations. As a result, some of our estimates and assumptions required increased judgment and carry a higher degree of variability and volatility. As events continue to evolve and additional information becomes available, our estimates may change materially in future periods.
Risks and Uncertainties	Risks and Uncertainties In December 2019, a novel strain of coronavirus (“COVID-19”) was reported in Wuhan, China, and on March 11, 2020 was declared a global pandemic. We are subject to risks and uncertainties as a result of the COVID-19 pandemic. COVID-19 has caused material declines in demand within the travel, hospitality, restaurant, and leisure industry. The pandemic’s proliferation, concurrent with travel bans, increased governmental restrictions and mandates globally, to limit the spread of the virus, has dampened consumer demand for our products and services, which has adversely and materially affected our business, results of operations and financial condition. We believe the travel industry and our business will continue to be adversely and materially affected while travel bans and other government restrictions and mandates continue to remain in place. However, the extent of the impact of the COVID-19 pandemic on our business remains highly uncertain and difficult to predict, as the response to the pandemic continues to be ongoing and shifting as information is rapidly evolving, and the duration and severity of the pandemic are also uncertain and cannot be predicted. In addition, we do not have visibility into when these bans will be lifted, where additional bans may be initiated, or where bans that have been previously lifted are reinstated due to resurgence of virus, nor do we have visibility into the changes to consumer usage patterns on our platform or travel behavior patterns when travel bans and other government restrictions and mandates are fully lifted. Furthermore, capital markets and economies worldwide have also been negatively impacted by the COVID-19 pandemic, and it is possible that it could cause a protracted local and/or global economic recession. Such economic disruption could have a material adverse effect on our business as consumers reduce their discretionary spending. Policymakers around the globe have responded with fiscal policy actions to support certain areas of the travel industry and economy as a whole. The magnitude and overall effectiveness of these actions remains uncertain. The Company's future results of operations and liquidity could also be adversely impacted by delays in payments of outstanding accounts receivable amounts beyond normal payment terms, travel supplier and restaurant insolvencies, and the impact of any initiatives or programs that the Company may undertake to address financial and operational challenges faced by the Company and its customers. As of the date of issuance of these unaudited condensed consolidated financial statements, the extent and duration to which the COVID-19 pandemic may materially impact the Company's financial condition, liquidity, or results of operations in the future continues to be uncertain.
Seasonality	Seasonality Consumers’ travel expenditures have historically followed a seasonal pattern. Correspondingly, travel partners’ advertising investments, and therefore our revenue and profits, have also historically followed a seasonal pattern. Our financial performance tends to be seasonally highest in the second and third quarters of a given year, which includes the seasonal peak in consumer demand, traveler hotel and rental stays, and travel activities and experiences taken, compared to the first and fourth quarters, which represent seasonal low points. Significant shifts in our business mix or adverse economic conditions could result in future seasonal patterns that are different from historical trends. In addition, due to the impact of COVID-19 to our business, we did not experience our typical seasonal pattern for revenue and profit during the three months ended June 30, 2020. In addition, cash outflows to travel suppliers related to deferred merchant payables significantly exceeded cash received from travelers during the first six months of 2020, reflecting the decline in consumer demand for our products and cancellations of reservations related to COVID-19, contributing significantly to unfavorable working capital trends and material negative operating cash flow during the six months ended June 30, 2020. It is difficult to forecast the seasonality for the upcoming quarters, given the uncertainty related to the extent and duration of the impact from COVID-19 and the shape and timing of a recovery.
Significant Accounting Policies	Significant Accounting Policies With the exception of the change for the accounting of credit losses as a result of adopting ASC 326 – Financial Instruments – Credit Losses (“ASC 326”) on January 1, 2020, as discussed below, there have been no other significant changes to our accounting policies since December 31, 2019, as described under “Note 2: Significant Accounting Policies”, in the notes to consolidated financial statements in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2019.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Credit Losses In June 2016, the FASB issued new accounting guidance which replaces the incurred loss impairment model with an expected loss methodology on the measurement of credit losses for financial assets measured at amortized cost, which includes accounts receivable, notes receivable, and available-for-sale debt securities. For financial assets measured at amortized cost, this new guidance requires an entity to: (1) estimate its lifetime expected credit losses upon recognition of the financial assets and establish an allowance to present the net amount expected to be collected; (2) recognize this allowance and changes in the allowance during subsequent periods through net income; and (3) consider relevant information about past events, current conditions and reasonable and supportable forecasts in assessing the lifetime expected credit losses. For available-for-sale debt securities, this new guidance made several targeted amendments to the existing other-than-temporary impairment model, including: (1) requiring disclosure of the allowance for credit losses; (2) allowing reversals of the previously recognized credit losses until the entity has the intent to sell, is more-likely-than-not required to sell the securities or the maturity of the securities; (3) limiting impairment to the difference between the amortized cost basis and fair value; and (4) not allowing entities to consider the length of time that fair value has been less than amortized cost as a factor in evaluating whether a credit loss exists. In addition, ASC 326 made changes to the accounting for available-for-sale debt securities. One such change is to require credit losses to be presented as an allowance rather than as a write-down on available-for-sale debt securities management does not intend to sell or believes that it is more likely than not they will be required to sell. The Company adopted ASC 326 on January 1, 2020, using a modified retrospective transition method for all financial assets measured at amortized cost, which requires a cumulative-effect adjustment of initial application, if any, to be recognized on the date of adoption. The cumulative-effect adjustment recorded by the Company on January 1, 2020 to retained earnings on its unaudited condensed consolidated balance sheet was $3 million. Financial results for reporting periods beginning after January 1, 2020 are presented under the new guidance, while prior period amounts are not adjusted and continue to be reported in accordance with previous GAAP. During the three and six months ended June 30, 2020, the impact of adopting the expected credit loss model was not material to the Company. Credit loss estimates on accounts receivable are recorded in general and administrative expenses on our unaudited condensed consolidated statement of operations. Credit loss estimates on available-for-sale debt securities are recorded in interest expense on our unaudited condensed consolidated statement of operations. The Company has updated its significant accounting policies as described below as of January 1, 2020. Accounts Receivable and Allowance for Credit Losses. The Company historically recorded an allowance for doubtful accounts using the incurred loss model. Upon adoption of ASC 326, the Company transitioned to the “expected credit loss” methodology in estimating its allowance for credit losses. We apply the “expected credit loss” methodology by first assessing our historical losses based on credit sales and then adding in an assessment of expected changes in the foreseeable future, whether positive or negative, to the Company’s ability to collect its outstanding accounts receivables, or the expectation for future losses. The Company develops its expectation for future losses by assessing the profiles of its customers using their historical payment patterns, any known changes to those customers’ ability to fulfill their payment obligations, and assessing broader economic conditions that may impact our customers’ ability to pay their obligations. Where appropriate, the Company performs this analysis using a portfolio approach. Portfolios comprise customers with similar characteristics and payment history, and we have concluded that the aggregation of these customers into various portfolios does not produce a result that is materially different from considering the affected customers individually. Customers are assigned internal credit ratings, as determined by the Company, based on our collection profiles. Customers whose outstanding obligations are less likely to experience a credit loss are assigned a higher internal credit rating, and those customers whose outstanding obligations are more likely to experience a credit loss are assigned a lower credit rating. We recognize a greater credit loss allowance on the accounts receivable due from those customers in the lower credit tranche, as determined by the Company. When the Company becomes aware of facts and circumstances affecting an individual customer, it also takes that specific customer information into account as part of its calculation of expected credit losses. The Company's exposure to credit losses may increase if our customers are adversely affected by changes in macroeconomic pressures or uncertainty associated with local or global economic recessions, including the economic impact to our customers associated with COVID-19, or other customer-specific factors. Available-for-sale debt securities. The Company's investment portfolio at any point in time may contain investments in U.S. treasury and U.S. government agency securities, taxable and tax-exempt municipal notes, corporate notes and bonds, commercial paper, non-U.S. government agency securities, cash and term deposits, and money market funds. The Company segments its portfolio based on the underlying risk profiles of the securities and has a zero loss expectation for U.S. treasury and U.S. government agency securities. The Company regularly reviews the securities in an unrealized loss position and evaluates the expected credit loss risk by considering factors such as historical experience, market data, issuer-specific factors, and current economic conditions. As of June 30, 2020, the Company had no available-for-sale-debt securities.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2020

The accompanying unaudited condensed consolidated financial statements present our results of operations, financial position and cash flows on a consolidated basis. The unaudited condensed 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. All inter-company accounts and transactions have been eliminated in consolidation. One of our subsidiaries that operates in China has 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 these 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 activity of these affiliates. Our variable interest entities’ financial results were not material for all periods presented. Investments in entities in which we do not have a controlling financial interest are accounted for under the equity method, the fair value option, as available-for-sale securities or at cost adjusted for observable price changes and impairments, as appropriate.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”) and include all normal and recurring adjustments that management of the Company considers necessary for a fair presentation of its financial position and operating results. We prepared the unaudited condensed consolidated financial statements following the requirements of the U.S. Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, we condensed or omitted certain footnotes or other financial information that are normally required by GAAP for annual financial statements. Additionally, certain prior period amounts have been reclassified for comparability with the current period presentation. Our interim unaudited condensed consolidated financial statements are not necessarily indicative of results that may be expected for any other interim period or for the full year. These interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2019, previously filed with the SEC. The unaudited condensed consolidated balance sheet as of December 31, 2019 included herein was derived from the audited consolidated financial statements as of that date, but does not include all disclosures including notes required by GAAP.

As of June 30, 2020, Liberty TripAdvisor Holdings, Inc. (“LTRIP”) beneficially owned approximately 18.2 million shares of our common stock and 12.8 million shares of our Class B common stock, which constitute 14.9% 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 23.0% of the outstanding common stock. Because each share of Class B common stock 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 58.6% of our voting power. We had no related party transactions with LTRIP during the three and six months ended June 30, 2020 and 2019, respectively.

Accounting Estimates

We use estimates and assumptions in the preparation of our unaudited condensed 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 unaudited condensed 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 unaudited condensed consolidated financial statements include: (i) recognition and recoverability of goodwill, definite-lived intangibles and other long-lived assets; and (ii) accounting for income taxes.

The COVID-19 pandemic has created and may continue to create significant uncertainty in macroeconomic conditions, which may cause further business disruptions and adversely impact our results of operations. As a result, some of our estimates and assumptions required increased judgment and carry a higher degree of variability and volatility. As events continue to evolve and additional information becomes available, our estimates may change materially in future periods.

Risks and Uncertainties

In December 2019, a novel strain of coronavirus (“COVID-19”) was reported in Wuhan, China, and on March 11, 2020 was declared a global pandemic. We are subject to risks and uncertainties as a result of the COVID-19 pandemic. COVID-19 has caused material declines in demand within the travel, hospitality, restaurant, and leisure industry. The pandemic’s proliferation, concurrent with travel bans, increased governmental restrictions and mandates globally, to limit the spread of the virus, has dampened consumer demand for our products and services, which has adversely and materially affected our business, results of operations and financial condition. We believe the travel industry and our business will continue to be adversely and materially affected while travel bans and other government restrictions and mandates continue to remain in place. However, the extent of the impact of the COVID-19 pandemic on our business remains highly uncertain and difficult to predict, as the response to the pandemic continues to be ongoing and shifting as information is rapidly evolving, and the duration and severity of the pandemic are also uncertain and cannot be predicted. In addition, we do not have visibility into when these bans will be lifted, where additional bans may be initiated, or where bans that have been previously lifted are reinstated due to resurgence of virus, nor do we have visibility into the changes to consumer usage patterns on our platform or travel behavior patterns when travel bans and other government restrictions and mandates are fully lifted.

Furthermore, capital markets and economies worldwide have also been negatively impacted by the COVID-19 pandemic, and it is possible that it could cause a protracted local and/or global economic recession. Such economic disruption could have a material adverse effect on our business as consumers reduce their discretionary spending. Policymakers around the globe have responded with fiscal policy actions to support certain areas of the travel industry and economy as a whole. The magnitude and overall effectiveness of these actions remains uncertain.

The Company's future results of operations and liquidity could also be adversely impacted by delays in payments of outstanding accounts receivable amounts beyond normal payment terms, travel supplier and restaurant insolvencies, and the impact of any initiatives or programs that the Company may undertake to address financial and operational challenges faced by the Company and its customers. As of the date of issuance of these unaudited condensed consolidated financial statements, the extent and duration to which the COVID-19 pandemic may materially impact the Company's financial condition, liquidity, or results of operations in the future continues to be uncertain.

Seasonality

Consumers’ travel expenditures have historically followed a seasonal pattern. Correspondingly, travel partners’ advertising investments, and therefore our revenue and profits, have also historically followed a seasonal pattern. Our financial performance tends to be seasonally highest in the second and third quarters of a given year, which includes the seasonal peak in consumer demand, traveler hotel and rental stays, and travel activities and experiences taken, compared to the first and fourth quarters, which represent seasonal low points. Significant shifts in our business mix or adverse economic conditions could result in future seasonal patterns that are different from historical trends.

In addition, due to the impact of COVID-19 to our business, we did not experience our typical seasonal pattern for revenue and profit during the three months ended June 30, 2020. In addition, cash outflows to travel suppliers related to deferred merchant payables significantly exceeded cash received from travelers during the first six months of 2020, reflecting the decline in consumer demand for our products and cancellations of reservations related to COVID-19, contributing significantly to unfavorable working capital trends and material negative operating cash flow during the six months ended June 30, 2020. It is difficult to forecast the

seasonality for the upcoming quarters, given the uncertainty related to the extent and duration of the impact from COVID-19 and the shape and timing of a recovery.

Significant Accounting Policies

With the exception of the change for the accounting of credit losses as a result of adopting ASC 326 – Financial Instruments – Credit Losses (“ASC 326”) on January 1, 2020, as discussed below, there have been no other significant changes to our accounting policies since December 31, 2019, as described under “Note 2: Significant Accounting Policies”, in the notes to consolidated financial statements in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2019.

Recently Adopted Accounting Pronouncements

Credit Losses

In June 2016, the FASB issued new accounting guidance which replaces the incurred loss impairment model with an expected loss methodology on the measurement of credit losses for financial assets measured at amortized cost, which includes accounts receivable, notes receivable, and available-for-sale debt securities. For financial assets measured at amortized cost, this new guidance requires an entity to: (1) estimate its lifetime expected credit losses upon recognition of the financial assets and establish an allowance to present the net amount expected to be collected; (2) recognize this allowance and changes in the allowance during subsequent periods through net income; and (3) consider relevant information about past events, current conditions and reasonable and supportable forecasts in assessing the lifetime expected credit losses. For available-for-sale debt securities, this new guidance made several targeted amendments to the existing other-than-temporary impairment model, including: (1) requiring disclosure of the allowance for credit losses; (2) allowing reversals of the previously recognized credit losses until the entity has the intent to sell, is more-likely-than-not required to sell the securities or the maturity of the securities; (3) limiting impairment to the difference between the amortized cost basis and fair value; and (4) not allowing entities to consider the length of time that fair value has been less than amortized cost as a factor in evaluating whether a credit loss exists. In addition, ASC 326 made changes to the accounting for available-for-sale debt securities. One such change is to require credit losses to be presented as an allowance rather than as a write-down on available-for-sale debt securities management does not intend to sell or believes that it is more likely than not they will be required to sell.

The Company adopted ASC 326 on January 1, 2020, using a modified retrospective transition method for all financial assets measured at amortized cost, which requires a cumulative-effect adjustment of initial application, if any, to be recognized on the date of adoption. The cumulative-effect adjustment recorded by the Company on January 1, 2020 to retained earnings on its unaudited condensed consolidated balance sheet was $3 million. Financial results for reporting periods beginning after January 1, 2020 are presented under the new guidance, while prior period amounts are not adjusted and continue to be reported in accordance with previous GAAP. During the three and six months ended June 30, 2020, the impact of adopting the expected credit loss model was not material to the Company. Credit loss estimates on accounts receivable are recorded in general and administrative expenses on our unaudited condensed consolidated statement of operations. Credit loss estimates on available-for-sale debt securities are recorded in interest expense on our unaudited condensed consolidated statement of operations. The Company has updated its significant accounting policies as described below as of January 1, 2020.

Accounts Receivable and Allowance for Credit Losses. The Company historically recorded an allowance for doubtful accounts using the incurred loss model. Upon adoption of ASC 326, the Company transitioned to the “expected credit loss” methodology in estimating its allowance for credit losses.

We apply the “expected credit loss” methodology by first assessing our historical losses based on credit sales and then adding in an assessment of expected changes in the foreseeable future, whether positive or negative, to the Company’s ability to collect its outstanding accounts receivables, or the expectation for future losses. The Company develops its expectation for future losses by assessing the profiles of its customers using their historical payment patterns, any known changes to those customers’ ability to fulfill their payment obligations, and assessing broader economic conditions that may impact our customers’ ability to pay their obligations. Where appropriate, the Company performs this analysis using a portfolio approach. Portfolios comprise customers with similar characteristics and payment history, and we have concluded that the aggregation of these customers into various portfolios does not produce a result that is materially different from considering the affected customers individually. Customers are assigned internal credit ratings, as determined by the Company, based on our collection profiles. Customers whose outstanding obligations are less likely to experience a credit loss are assigned a higher internal credit rating, and those customers whose outstanding obligations are more likely to experience a credit loss are assigned a lower credit rating. We recognize a greater credit loss allowance on the accounts receivable due from those customers in the lower credit tranche, as determined by the Company. When the Company becomes aware

of facts and circumstances affecting an individual customer, it also takes that specific customer information into account as part of its calculation of expected credit losses.

The Company's exposure to credit losses may increase if our customers are adversely affected by changes in macroeconomic pressures or uncertainty associated with local or global economic recessions, including the economic impact to our customers associated with COVID-19, or other customer-specific factors.

Available-for-sale debt securities. The Company's investment portfolio at any point in time may contain investments in U.S. treasury and U.S. government agency securities, taxable and tax-exempt municipal notes, corporate notes and bonds, commercial paper, non-U.S. government agency securities, cash and term deposits, and money market funds. The Company segments its portfolio based on the underlying risk profiles of the securities and has a zero loss expectation for U.S. treasury and U.S. government agency securities. The Company regularly reviews the securities in an unrealized loss position and evaluates the expected credit loss risk by considering factors such as historical experience, market data, issuer-specific factors, and current economic conditions. As of June 30, 2020, the Company had no available-for-sale-debt securities.