Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We are subject to both direct and indirect taxation in the U.S. and various states and foreign jurisdictions. We are under examination by certain tax authorities for the 2008 to 2018 tax years. We believe that adequate amounts have been reserved for any adjustments that may ultimately result from these or other examinations. The material jurisdictions where we are subject to potential examination by tax authorities for tax years after 2007 include, among others, the U.S. (Federal and California), Germany, Korea, Israel, Switzerland and the United Kingdom. Although the timing of the resolution and/or closure of audits is highly uncertain, it is reasonably possible that the balance of gross unrecognized tax benefits could significantly change in the next 12 months. Given the number of years remaining subject to examination and the number of matters being examined, we are unable to estimate the full range of possible adjustments to the balance of gross unrecognized tax benefits. We expect the gross amount of unrecognized tax benefits to be reduced within the next twelve months by at least $16 million. We have recognized the tax consequences of all foreign unremitted earnings and management has no specific plans to indefinitely reinvest the unremitted earnings of our foreign subsidiaries as of the balance sheet date. We have not provided for deferred taxes on outside basis differences in our investments in our foreign subsidiaries that are unrelated to unremitted earnings. With the exception of our Classifieds entities, these basis differences will be indefinitely reinvested. A determination of the unrecognized deferred taxes related to these other components of our outside basis difference is not practicable. In connection with the intent to sell the Classifieds business as discussed in “Note 1 – The Company and Summary of Significant Accounting Policies”, we assessed the outside basis differences relating to Classifieds and determined that they were not material as of June 30, 2020. On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion invalidating the regulations relating to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. A final decision was issued by the Tax Court in December 2015. The Internal Revenue Service (“IRS”) appealed the decision in June 2016. On July 24, 2018, the Ninth Circuit Federal Court issued a decision that was subsequently withdrawn and a reconstituted panel has conferred on the appeal. On June 7, 2019, the Ninth Circuit Federal Court upheld the cost-sharing regulations and on November 11, 2019 the U.S. Tax Court of Appeals for the Ninth Circuit released a court order denying an en banc rehearing of the case Altera Corp. v Commissioner following Altera’s petition filed on July 22, 2019. On February 10, 2020, a petition for writ of certiorari was filed with the U.S. Supreme Court. On June 22, 2020, the U.S. Supreme Court declined to issue a writ of certiorari, thus leaving the Ninth Circuit’s ruling intact. There is no impact to our consolidated financial statements.

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.