Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These accompanying financial statements present our results of operations, financial position and cash flows on a consolidated basis. The unaudited consolidated financial statements include Expedia, Inc., 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 have eliminated significant intercompany transactions and accounts. We have prepared the accompanying unaudited consolidated financial statements in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial reporting. We have included all adjustments necessary for a fair presentation of the results of the interim period. These adjustments consist of normal recurring items. Our interim unaudited 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 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, 2015, previously filed with the Securities and Exchange Commission.
Accounting Estimates	Accounting Estimates We use estimates and assumptions in the preparation of our interim unaudited 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 interim unaudited 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 interim unaudited consolidated financial statements include revenue recognition; recoverability of current and long-lived assets, intangible assets and goodwill; income and transactional taxes, such as potential settlements related to occupancy and excise taxes; loss contingencies; loyalty program liabilities; redeemable noncontrolling interests; acquisition purchase price allocations; stock-based compensation and accounting for derivative instruments.
Reclassifications	Reclassifications We have reclassified certain amounts related to our prior period results to conform to our current period presentation.
Seasonality	Seasonality We generally experience seasonal fluctuations in the demand for our travel products and services. For example, traditional leisure travel bookings are generally the highest in the first three quarters as travelers plan and book their spring, summer and holiday travel. The number of bookings typically decreases in the fourth quarter. Because revenue for most of our travel products, including merchant and agency hotel, is recognized when the travel takes place rather than when it is booked, revenue typically lags bookings by several weeks or longer. The seasonal revenue impact is exacerbated with respect to income by the nature of our variable cost of revenue and direct sales and marketing costs, which we typically realize in closer alignment to booking volumes, and the more stable nature of our fixed costs. Furthermore, operating profits for our primary advertising business, trivago, are experienced in the second half of the year as selling and marketing costs offset revenue in the first half of the year as we aggressively market during the busy booking period for summer travel. As a result, revenue and income are typically the lowest in the first quarter and highest in the third quarter. The continued growth of our international operations or a change in our product mix, including the assimilation, growth and shift to more of a transaction-based business model for the vacation rental listing business of HomeAway, may influence the typical trend of the seasonality in the future.
Recent Accounting Policies	Recent Accounting Policies Not Yet Adopted In May 2014, the FASB issued an ASU amending revenue recognition guidance and requiring more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. In August 2015, the FASB issued an ASU deferring the effective date of the revenue standard so it would be effective for annual and interim reporting periods beginning after December 15, 2017, with early adoption prohibited before December 15, 2016. We are in the process of evaluating the impact of the adoption of this new guidance on our consolidated financial statements. In January 2016, the FASB issued new guidance related to accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The new standard is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. We are in the process of evaluating the impact of adopting this new guidance on our consolidated financial statements. In February 2016, the FASB issued new guidance related to accounting and reporting guidelines for leasing arrangements. The new guidance requires entities that lease assets to recognize assets and liabilities on the balance sheet related to the rights and obligations created by those leases regardless of whether they are classified as finance or operating leases. Consistent with current guidance, the recognition, measurement, and presentation of expenses and cash flows arising from a lease primarily will depend on its classification as a finance or operating lease. The guidance also requires new disclosures to help financial statement users better understand the amount, timing and uncertainty of cash flows arising from leases. This guidance is effective for annual and interim reporting periods beginning after December 15, 2018. Early adoption is permitted and should be applied using a modified retrospective approach. We are in the process of evaluating the impact of adopting this new guidance on our consolidated financial statements. In August 2016, the FASB issued new guidance related to the statement of cash flows which clarifies how companies present and classify certain cash receipts and cash payments. The new standard is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 with early adoption permitted. We are in the process of evaluating the impact of adopting this new guidance on our consolidated financial statements. Recently Adopted Accounting Policies As of January 1, 2016, we adopted the Accounting Standard Update (“ASU”) requiring debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. Upon adoption, we retroactively restated deferred issuance costs from current and long-term assets to the respective debt liability. The adoption of this guidance and prior fiscal year reclassifications did not have a material impact on our previously reported consolidated financial statements. As of January 1, 2016, we prospectively adopted the ASU clarifying the accounting for fees paid by a customer in a cloud computing arrangement. This standard clarified whether a customer should account for a cloud computing arrangement as an acquisition of a software license or as a service arrangement by providing characteristics that a cloud computing arrangement must have in order to be accounted for as a software license acquisition. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If the arrangement does not include a software license, the customer should account for a cloud computing arrangement as a service contract. The adoption of this new guidance did not have a material impact on our consolidated financial statements. In March 2016, the Financial Accounting Standards Board (“FASB”) issued new guidance related to accounting for share-based payments. The updated guidance changes how companies account for certain aspects of share-based payments awards to employees, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The guidance is effective for annual and interim reporting periods beginning after December 15, 2016, with early adoption permitted. We elected to early adopt the new guidance in the second quarter of 2016, which requires us to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. The primary impact of adoption was the recognition of excess tax benefits in our provision for income taxes rather than additional paid-in capital for all periods in 2016. Additionally, our consolidated statement of cash flows now present excess tax benefits as an operating activity on a prospective basis. Finally, we have elected to account for forfeitures as they occur, rather than estimate expected forfeitures. The net cumulative effect of this change was recognized as a $7 million reduction to retained earnings as of January 1, 2016. Adoption of the new guidance resulted in the recognition of excess tax benefits in our provision for income taxes rather than additional paid-in capital of $10 million and $27 million for the three and nine months ended September 30, 2016.
Fair Value Measurements	We also hold time deposit investments with financial institutions. Time deposits with original maturities of less than three months are classified as cash equivalents and those with remaining maturities of less than one year are classified within short-term investments. Derivative instruments are carried at fair value on our consolidated balance sheets. We use foreign currency forward contracts to economically hedge certain merchant revenue exposures, foreign denominated liabilities related to certain of our loyalty programs and our other foreign currency-denominated operating liabilities. 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. Our foreign currency forward contracts are typically short-term and, as they do not qualify for hedge accounting treatment, we classify the changes in their fair value in other, net. We classify our cash equivalents and investments within Level 1 and Level 2 as we value our cash equivalents and investments using quoted market prices or alternative pricing sources and models utilizing market observable inputs. Valuation of the foreign currency forward contracts is based on foreign currency exchange rates in active markets, a Level 2 input.