Income Taxes	6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 9: INCOME TAXES Each interim period is considered an integral part of the annual period and, accordingly, we measure our income tax expense using an estimated annual effective tax rate. An enterprise is required, at the end of each interim reporting period, to make its best estimate of the annual effective tax rate for the full fiscal year and use that rate to provide for income taxes on a current year-to-date basis, as adjusted for discrete taxable events that occur during the interim period. On March 27, 2020, the U.S. government enacted the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act"). The CARES Act is an emergency economic stimulus package in response to the COVID-19 pandemic, which among other things contains numerous income tax provisions. Some of these tax provisions are expected to be effective retroactively for fiscal years ended before the date of enactment. We anticipate that we will benefit from the temporary five-year net operating loss carryback provisions to generate a refund of previously paid income taxes, modifications to the net interest deduction limitations, the technical correction for qualified leasehold improvements, which changes 39-year property to 15-year property, eligible for 100% tax bonus depreciation, and potentially other provisions within the CARES Act. We had income tax benefits of $26 million and $38 million for the three and six months ended June 30, 2020, respectively, and income tax expense of $34 million and $41 million for the three and six months ended June 30, 2019, respectively. The decrease in our income tax expense during the three and six months ended June 30, 2020, when compared to the same periods in 2019, was primarily due to pretax losses incurred during both the three and six months ended June 30, 2020, respectively, and a tax benefit of $5 million and $19 million during the three and six months ended June 30, 2020, respectively, from the tax rate differential in tax years applicable to U.S. loss carryforwards that became eligible for carryback under the CARES Act enacted in March 2020, offset by an increase in the recognition of stock-based compensation shortfalls related to the decline in the Company’s stock price during both the three and six months ended June 30, 2020, respectively. Our policy is to recognize accrued interest and penalties related to unrecognized tax benefits and income tax liabilities as part of our income tax expense. As of June 30, 2020, we had an accrued interest liability of $24 million, net of federal and state benefit, and no penalties have been accrued. By virtue of consolidated income tax returns previously filed with Expedia, we are currently under an IRS audit for the 2009, 2010 and short-period 2011 tax years. We are separately under examination by the IRS for the short-period 2011 and 2012 through 2016 tax years, under an employment tax audit by the IRS for the 2015 through 2017 tax years, and have various ongoing audits for state income tax returns. These audits include questioning of the timing and the amount of income and deductions and the allocation of income among various tax jurisdictions. These examinations may lead to proposed or ordinary course adjustments to our taxes. We are no longer subject to tax examinations by tax authorities for years prior to 2009. As of June 30, 2020, no material assessments have resulted, except as noted below regarding our 2009, 2010, and 2011 IRS audit with Expedia and our 2012 and 2013 standalone IRS audit. In January 2017 and April 2019, as part of the IRS audit of Expedia, we received Notices of Proposed Adjustment from the IRS for the 2009, 2010, and 2011 tax years. Subsequently, in September 2019, as part of Tripadvisor’s standalone audit, we received Notices of Proposed Adjustment from the IRS for the 2012 and 2013 tax years. These proposed adjustments are related to certain transfer pricing arrangements with our foreign subsidiaries, and would result in an increase to our worldwide income tax expense in an estimated range of $50 million to $60 million at the close of the audit if the IRS prevails. The estimated range takes into consideration competent authority relief and transition tax regulations, and is exclusive of interest, which would be significant. We disagree with the proposed adjustments and we intend to defend our position through applicable administrative and, if necessary, judicial remedies. Our policy is to review and update tax reserves as facts and circumstances change. Based on our interpretation of the regulations and available case law, we believe the position we have taken with regard to transfer pricing with our foreign subsidiaries is sustainable. In addition to the risk of additional tax for 2009 through 2013 transactions, if the IRS were to seek transfer pricing adjustments of a similar nature for transactions in subsequent years, we would be subject to significant additional tax liabilities. We have requested competent authority assistance under the Mutual Agreement Procedure (“MAP”) for tax years 2009 through 2013. We expect the competent authorities to present a resolution for the 2009 through 2011 tax years in the near future. Upon receipt, we will assess the resolution provided by the competent authorities as well as its impact on our existing income tax reserves for all open subsequent years. In July 2015, the United States Tax Court (the “Court”) issued an opinion favorable to Altera with respect to Altera’s litigation with the IRS. This opinion was submitted as a final decision under Tax Court Rule 155 during December 2015. The litigation relates to the treatment of stock-based compensation expense in an inter-company cost-sharing arrangement with Altera’s foreign subsidiary. In its opinion, the Court accepted Altera’s position of excluding stock-based compensation from its inter-company cost-sharing arrangement. The IRS appealed the Court decision on February 19, 2016. On June 7, 2019, a three-judge panel from the Ninth Circuit Court of Appeals reversed the Court’s decision and upheld the validity of the Treasury regulation (Reg. sec. 1.482-7A(d)(2)) requiring stock-based compensation costs to be included in the costs shared in a cost-sharing arrangement. Based on this Ninth Circuit Court of Appeals decision, we recorded a cumulative income tax expense of $15 million during the year ended December 31, 2019, which was a reversal of income tax benefits taken by the Company since the Court’s 2015 opinion. In November 2019, the Ninth Circuit denied Altera’s request for a rehearing en banc. On February 10, 2020, Altera filed a certiorari petition with the Supreme Court, asking it to hear an appeal of the Ninth Circuit’s decision. On June 22, 2020, the Supreme Court denied Altera’s request to review the Ninth Circuit decision.

Income Taxes

6 Months Ended

Jun. 30, 2020

NOTE 9: INCOME TAXES

Each interim period is considered an integral part of the annual period and, accordingly, we measure our income tax expense using an estimated annual effective tax rate. An enterprise is required, at the end of each interim reporting period, to make its best estimate of the annual effective tax rate for the full fiscal year and use that rate to provide for income taxes on a current year-to-date basis, as adjusted for discrete taxable events that occur during the interim period.

On March 27, 2020, the U.S. government enacted the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act"). The CARES Act is an emergency economic stimulus package in response to the COVID-19 pandemic, which among other things contains numerous income tax provisions. Some of these tax provisions are expected to be effective retroactively for fiscal years ended before the date of enactment. We anticipate that we will benefit from the temporary five-year net operating loss carryback provisions to generate a refund of previously paid income taxes, modifications to the net interest deduction limitations, the technical correction for qualified leasehold improvements, which changes 39-year property to 15-year property, eligible for 100% tax bonus depreciation, and potentially other provisions within the CARES Act.

We had income tax benefits of $26 million and $38 million for the three and six months ended June 30, 2020, respectively, and income tax expense of $34 million and $41 million for the three and six months ended June 30, 2019, respectively. The decrease in our income tax expense during the three and six months ended June 30, 2020, when compared to the same periods in 2019, was primarily due to pretax losses incurred during both the three and six months ended June 30, 2020, respectively, and a tax benefit of $5 million and $19 million during the three and six months ended June 30, 2020, respectively, from the tax rate differential in tax years applicable to U.S. loss carryforwards that became eligible for carryback under the CARES Act enacted in March 2020, offset by an increase in the recognition of stock-based compensation shortfalls related to the decline in the Company’s stock price during both the three and six months ended June 30, 2020, respectively.

Our policy is to recognize accrued interest and penalties related to unrecognized tax benefits and income tax liabilities as part of our income tax expense. As of June 30, 2020, we had an accrued interest liability of $24 million, net of federal and state benefit, and no penalties have been accrued.

By virtue of consolidated income tax returns previously filed with Expedia, we are currently under an IRS audit for the 2009, 2010 and short-period 2011 tax years. We are separately under examination by the IRS for the short-period 2011 and 2012 through 2016 tax years, under an employment tax audit by the IRS for the 2015 through 2017 tax years, and have various ongoing audits for state income tax returns. These audits include questioning of the timing and the amount of income and deductions and the allocation of income among various tax jurisdictions. These examinations may lead to proposed or ordinary course adjustments to our taxes. We are no longer subject to tax examinations by tax authorities for years prior to 2009. As of June 30, 2020, no material assessments have resulted, except as noted below regarding our 2009, 2010, and 2011 IRS audit with Expedia and our 2012 and 2013 standalone IRS audit.

In January 2017 and April 2019, as part of the IRS audit of Expedia, we received Notices of Proposed Adjustment from the IRS for the 2009, 2010, and 2011 tax years. Subsequently, in September 2019, as part of Tripadvisor’s standalone audit, we received Notices of Proposed Adjustment from the IRS for the 2012 and 2013 tax years. These proposed adjustments are related to certain transfer pricing arrangements with our foreign subsidiaries, and would result in an increase to our worldwide income tax expense in an estimated range of $50 million to $60 million at the close of the audit if the IRS prevails. The estimated range takes into consideration

competent authority relief and transition tax regulations, and is exclusive of interest, which would be significant. We disagree with the proposed adjustments and we intend to defend our position through applicable administrative and, if necessary, judicial remedies. Our policy is to review and update tax reserves as facts and circumstances change. Based on our interpretation of the regulations and available case law, we believe the position we have taken with regard to transfer pricing with our foreign subsidiaries is sustainable. In addition to the risk of additional tax for 2009 through 2013 transactions, if the IRS were to seek transfer pricing adjustments of a similar nature for transactions in subsequent years, we would be subject to significant additional tax liabilities. We have requested competent authority assistance under the Mutual Agreement Procedure (“MAP”) for tax years 2009 through 2013. We expect the competent authorities to present a resolution for the 2009 through 2011 tax years in the near future. Upon receipt, we will assess the resolution provided by the competent authorities as well as its impact on our existing income tax reserves for all open subsequent years.

In July 2015, the United States Tax Court (the “Court”) issued an opinion favorable to Altera with respect to Altera’s litigation with the IRS. This opinion was submitted as a final decision under Tax Court Rule 155 during December 2015. The litigation relates to the treatment of stock-based compensation expense in an inter-company cost-sharing arrangement with Altera’s foreign subsidiary. In its opinion, the Court accepted Altera’s position of excluding stock-based compensation from its inter-company cost-sharing arrangement. The IRS appealed the Court decision on February 19, 2016. On June 7, 2019, a three-judge panel from the Ninth Circuit Court of Appeals reversed the Court’s decision and upheld the validity of the Treasury regulation (Reg. sec. 1.482-7A(d)(2)) requiring stock-based compensation costs to be included in the costs shared in a cost-sharing arrangement. Based on this Ninth Circuit Court of Appeals decision, we recorded a cumulative income tax expense of $15 million during the year ended December 31, 2019, which was a reversal of income tax benefits taken by the Company since the Court’s 2015 opinion. In November 2019, the Ninth Circuit denied Altera’s request for a rehearing en banc. On February 10, 2020, Altera filed a certiorari petition with the Supreme Court, asking it to hear an appeal of the Ninth Circuit’s decision. On June 22, 2020, the Supreme Court denied Altera’s request to review the Ninth Circuit decision.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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