Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] 0.500% Senior Notes Due 2028 0.5% Senior Notes Due March 2028 [Member] 0.5% Senior Notes Due March 2028 Common stock, $0.008 par value, Authorized shares: 25,000 Issued shares: 1,618 and 1,613, respectively Common Stock, Value, Issued Schedule of senior notes issued Schedule of Long-Term Debt Instruments [Table Text Block] Accruals for loss contingencies Loss Contingency Accrual Restatement Determination Date Restatement Determination Date Money market fund investments and certificates of deposit Money Market Funds and Certificates of Deposit [Member] Money Market Funds and Certificates of Deposit Derivative Instrument [Axis] Derivative Instrument [Axis] Measurement Frequency [Axis] Measurement Frequency [Axis] Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Provision charged to earnings Accounts Receivable, Credit Loss Expense (Reversal) Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 3.625% Senior Notes Due 2028 3.625% Senior Notes Due November 2028 [Member] 3.625% Senior Notes Due November 2028 INVESTMENTS Investment [Text Block] Standby Letters of Credit and Bank Guarantees Standby Letters of Credit [Member] Loss Contingencies [Table] Loss Contingencies [Table] Notional Amount, Type [Axis] Notional Amount, Type [Axis] Notional Amount, Type Before tax AOCI Including Portion Attributable to Noncontrolling Interest, Before Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Before Tax Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share ASSETS: Assets, Fair Value Disclosure [Abstract] Additions to property and equipment Segment Reporting, Long-Lived Asset, Expenditure for Addition Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Unvested, beginning of period (in shares) Unvested, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Notional amount Derivative, Notional Amount Weighted-average number of basic common shares outstanding (in shares) Weighted-average number of basic common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Cumulative impairment charges Goodwill, Impaired, Accumulated Impairment Loss Long-term investments Carrying Value Long-Term Investments Activity of Restricted Stock Units and Performance Share Units Share-Based Payment Arrangement, Activity [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Commitments and Contingencies Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Deferred merchant bookings Deferred Merchant Bookings This relates to transactions where travelers purchase hotel room reservations or car rental reservations from travel service provider at price-disclosed rates. Charges are billed to the traveler at the time of booking. Merchant revenue (the difference between the selling price and the cost of the hotel room reservation or car rental reservation) and the accounts payable to the travel service provider are recognized at the conclusion of the traveler's stay at the hotel or when the traveler returns the rental car as amounts collected are generally refundable upon cancellation prior to the hotel stay or rental car pick-up. Entity Address, City or Town Entity Address, City or Town Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Loss contingency accrual, period decrease Adjustment related to the Netherlands pension fund matter Loss Contingency Accrual, Period Increase (Decrease) Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net income Net income Net income Net Income (Loss) Available to Common Stockholders, Basic Accounts receivable, net (Allowance for expected credit losses of $141 and $137, respectively) Accounts and Other Receivables, Net, Current Intangible assets, accumulated amortization Intangible Asset, Finite-Lived, Accumulated Amortization Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Short-term debt Long-Term Debt, Current Maturities Common Stock Repurchase Program Common Stock Repurchase Program [Member] Common Stock Repurchase Program Revenue Benchmark Revenue Benchmark [Member] Restricted Stock Units and Performance Share Units Awards Other Than Options [Member] Discloses pertinent information related to awards other than stock options awarded as part of an equity-based compensation plan. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Treasury stock: 860 and 816 shares, respectively Treasury Stock, Value Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Noncash investing activity related to additions to property and equipment, including stock-based compensation and accrued liabilities Capital Expenditures Incurred but Not yet Paid Segment Reporting Segment Reporting [Table Text Block] Cost Long term investment, cost Long term investment, cost Gross Unrealized Gains / Upward Adjustments Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Carrying value of long-term debt Long-Term Debt 3.250% Senior Notes Due 2032 3.25% Senior Notes due November 2032 [Member] 3.25% Senior Notes due November 2032 Document Period End Date Document Period End Date Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Unrecognized tax benefits Unrecognized Tax Benefits Aggregate principal amount Debt Instrument, Face Amount Security Exchange Name Security Exchange Name Effective interest rate Debt Instrument, Interest Rate, Effective Percentage SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] Other comprehensive (loss) income ("OCI") for the period Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 4.750% Senior Notes Due 2034 4.75% Senior Notes Due November 2034 [Member] 4.75% Senior Notes Due November 2034 Exercise of stock options and vesting of restricted stock units and performance share units Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture Aggregate fair value of performance share units and restricted stock units vested during the period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Activity of the allowance for expected credit losses on receivables Accounts Receivable, Allowance for Credit Loss [Table Text Block] Foreign currency purchases Foreign currency purchases [Member] Foreign currency purchases NET INCOME PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Reconciliation of the weighted-average number of shares outstanding used in calculating diluted net income per share Schedule of Weighted Average Number of Shares [Table Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Tax and Customs Administration, Netherlands Tax and Customs Administration, Netherlands [Member] Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] 3.875% Senior Notes Due 2045 3.875% Senior Notes Due March 2045 [Member] 3.875% Senior Notes Due March 2045 Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Foreign currency translation Accumulated Foreign Currency Adjustment Attributable To Parent, Foreign Currency Translation [Member] Accumulated Foreign Currency Adjustment Attributable To Parent, Foreign Currency Translation [Member] Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Aggregate principal amount Long-Term Debt, Gross Sales and other expenses Sales and other expenses "Sales and other expenses" are generally variable in nature and consist primarily of: (1) credit cards and other payment processing fees associated with merchant transactions; (2) fees paid to third parties that provide call center, website content translations and other services; (3) provisions for customer chargebacks associated with merchant transactions; (4) customer relations costs; (5) provisions for credit losses and bad debt, primarily related to agency accommodation commission receivables; and (6) insurance claim costs. Cost Equity Securities, FV-NI, Cost Credit Facility [Domain] Credit Facility [Domain] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Interest and dividend income Investment Income, Interest and Dividend Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted-average number of diluted common shares outstanding (in shares) Weighted-average number of diluted common and common equivalent shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Agency revenues Agency Revenue [Member] Agency revenues are derived from travel-related transactions where the Company does not receive payments from travelers for the travel reservation services provided. Agency revenues consist almost entirely of travel reservation commissions, as well as certain global distribution fees ("GDS"), reservation booking fees and certain travel insurance fees. Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] 3.500% Senior Notes Due 2029 3.500% Senior Notes Due March 2029 [Member] 3.500% Senior Notes Due March 2029 Underlying Security Market Price Change Underlying Security Market Price Change, Percent Dividends Dividends Entities [Table] Entities [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Unfavorable Regulatory Action Unfavorable Regulatory Action [Member] Reportable Segment Reportable Segment [Member] Reportable Segment Performance shares adjustment (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Shares Adjustment Adjustment for performance share units based on estimated probable shares to be issued at the end of the performance period. Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Gross Unrealized Gains / Upward Adjustments Long term investment, gross unrealized gain Long term investment, gross unrealized gain Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Award Timing Predetermined Award Timing Predetermined [Flag] Treasury Stock Treasury Stock, Common [Member] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Letters of credit issued Letters of credit and bank guarantees issued Letters of Credit Outstanding, Amount Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Effective tax rate, percent Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Weighted-average dilutive stock options, restricted stock units and performance share units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Unvested, beginning of period (in dollars per share) Unvested, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value 4.500% Senior Notes Due 2046 4.500% Senior Notes Due May 2046 [Member] 4.500% Senior Notes Due May 2046 All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other Other Nonoperating Income (Expense), Other Miscellaneous Amounts Other Nonoperating Income (Expense), Other Miscellaneous Amounts Aggregate principal amount payable within the next twelve months Long-Term Debt, Maturities, Repayments of Principal in Next Rolling 12 Months Performance shares adjustment (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Other Adjustments Weighted Average Grant Date Fair Value The weighted average fair value of adjustments for probable shares to be issued related to performance share units granted for equity-based award plans other than stock (unit) option plans. ACCOUNTS RECEIVABLE AND OTHER FINANCIAL ASSETS Accounts and Nontrade Receivable [Text Block] Provision for expected credit losses and chargebacks Provision for expected credit losses and chargebacks Provision for expected credit losses and chargebacks Operating lease assets Operating Lease, Right-of-Use Asset Effective income tax rate at innovation box tax rate, percent Effective Income Tax Rate at Innovation Box Tax Rate This element represents the effective income tax rate on qualifying innovative activities under Innovative Box Tax. Concentration Risk Type [Domain] Concentration Risk Type [Domain] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] SEGMENT REPORTING AND GEOGRAPHIC INFORMATION Segment Reporting [Text Block] Minimum Minimum [Member] Long-term line of credit Long-Term Line of Credit Expiration Date Trading Arrangement Expiration Date 4.125% Senior Notes Due 2033 4.125% Senior Notes Due May 2033 [Member] 4.125% Senior Notes Due May 2033 Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Liabilities at fair value Financial Liabilities Fair Value Disclosure Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Income and Expenses [Abstract] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] OTHER INCOME (EXPENSE), NET Other Nonoperating Income and Expense [Text Block] Exercise Price Award Exercise Price INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Recurring Basis Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Amount of common stock repurchases authorized Share Repurchase Program, Authorized, Amount Total unrecognized estimated compensation expense, unvested share-based awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] DEBT Debt Disclosure [Text Block] Payments on maturity of debt Repayments on maturity of debt Repayments of Long-Term Debt Cost Equity Securities Without Readily Determinable Fair Value, Cost Cost of Equity Securities without readily determinable fair value Unamortized debt discounts and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Long-lived assets Finite-Lived Intangible Assets [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Foreign currency exchange derivatives Foreign Exchange Contract [Member] Change in fair value of the embedded derivative Change in fair value of the conversion option related to the convertible senior notes Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Receivables from customers Accounts Receivable, before Allowance for Credit Loss, Current Adoption Date Trading Arrangement Adoption Date Components of other income (expense), net Schedule of Other Nonoperating Income (Expense) [Table Text Block] Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Total stockholders' deficit Balance Balance Equity, Attributable to Parent Gross Unrealized Gains / Upward Adjustments Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, Before Tax Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, Before Tax Carrying value of the portions of euro-denominated debt designated as a net investment hedge Notional Amount of Nonderivative Instruments ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Gross Unrealized Losses / Downward Adjustments Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, Before Tax Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, Before Tax Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Gain related to settlement of litigation matters Litigation Settlement, Gain 3.625% Senior Notes Due 2032 3.625% Senior Notes Due March 2032 [Member] 3.625% Senior Notes Due March 2032 Nonrecurring Basis Fair Value, Nonrecurring [Member] Insider Trading Policies and Procedures [Line Items] TREASURY STOCK AND DIVIDENDS Treasury Stock [Text Block] Organization, Consolidation And Presentation Of Financial Statements [Table] Organization, Consolidation And Presentation Of Financial Statements [Table] Organization, Consolidation And Presentation Of Financial Statements [Table] Other financing activities Proceeds from (Payment for) Other Financing Activity Accounts receivable, allowance for expected credit losses Balance, beginning of year Balance, end of period Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Performance Share Units Performance Shares [Member] Deferred income taxes Deferred Income Tax Expense (Benefit) Letter of Credit Letter of Credit [Member] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Entity Central Index Key Entity Central Index Key All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Income Tax Income Tax, Policy [Policy Text Block] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation 3.500% Senior Notes Due 2030 3.500% Senior Notes Due 2030 3.5% Senior Notes due May 2030 [Member] 3.5% Senior Notes due May 2030 Income Statement [Abstract] Income Statement [Abstract] Stockholders' deficit: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Deferred merchant bookings and other current liabilities Increase (Decrease) in Operating Liabilities Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Operating expenses: Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Marketing expenses Marketing Expense Partner liability insurance maximum coverage per occurrence Partner Liability Insurance Maximum Partner Liability Insurance Maximum Accumulated Other Comprehensive Loss Total AOCI, net of tax AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Operating lease amortization Operating Lease, Right-of-Use Asset, Periodic Reduction Estimated fair value of outstanding debt Debt Instrument, Fair Value Disclosure Dividends paid Dividend paid Payments of Dividends Name Forgone Recovery, Individual Name 5.375% Senior Notes Due May 2036 5.375% Senior Notes Due May 2036 [Member] 5.375% Senior Notes Due May 2036 Total future compensation cost related to unvested share-based awards, expected period of recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 1.800% Senior Notes Due 2027 1.8% Senior Notes Due March 2027 [Member] 1.8% Senior Notes Due March 2027 [Member] Statement Statement [Line Items] Total assets Assets Weighted-average Grant-date Fair Value Per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] 4.250% Senior Notes Due 2029 4.25% Senior Notes Due May 2029 [Member] 4.25% Senior Notes Due May 2029 Convertible Senior Notes Convertible Debt [Member] Operating Segments Operating Segments [Member] 3.625% Senior Notes Due 2035 3.625% Senior Notes Due November 2035 [Member] 3.625% Senior Notes Due November 2035 Interest expense Interest Expense, Nonoperating Carrying Value Equity Securities without Readily Determinable Fair Value, Amount STOCK-BASED COMPENSATION Share-Based Payment Arrangement [Text Block] 4.125% Senior Notes Due 2038 4.125% Senior Notes Due May 2038 [Member] 4.125% Senior Notes Due May 2038 PEO PEO [Member] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Stock-based compensation expense Share-Based Payment Arrangement, Expense Cash Equivalents and Restricted Cash Equivalents Cash Equivalents [Member] Other long-term liabilities Other Liabilities, Noncurrent Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Reporting Unit [Axis] Reporting Unit [Axis] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Net (losses) gains on equity securities Net losses (gains) on equity securities Equity Securities, FV-NI, Gain (Loss) Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Operating lease liabilities Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value 4.000% Senior Notes Due 2034 4.000% Senior Notes Due 2034 4.0% Senior Notes due May 2034 [Member] 4.0% Senior Notes due May 2034 Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Net income applicable to common stockholders per diluted common share (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount General authorization for shares withheld on stock award vesting Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation LIABILITIES: Liabilities, Fair Value Disclosure [Abstract] Net losses (gains) on equity securities Unrealized Gain (Loss) on Investments 3.750% Senior Notes Due 2037 3.75% Senior Notes Due November 2037 [Member] 3.75% Senior Notes Due November 2037 Intangible assets amortization expense Intangible Asset, Finite-Lived, Amortization Expense Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Segment Adjusted EBITDA less Capex Segment Adjusted EBITDA less Capex Adjusted Earnings Before Interest Tax Depreciation And Amortization, Less Capex Adjusted Earnings Before Interest Tax Depreciation And Amortization, Less Capex FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Investments Investment [Table Text Block] Financial Instruments [Domain] Financial Instruments [Domain] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] INTANGIBLE ASSETS AND GOODWILL Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount REVENUES Revenue from Contract with Customer [Text Block] Prepaid expenses, net Prepaid Expense, Current Pension-related litigation Pension-related litigation [Member] Pension-related litigation Other investing activities Payment for (Proceeds from) Other Investing Activity 3.125% Senior Notes Due 2031 3.125% Senior Notes Due May 2031 [Member] 3.125% Senior Notes Due May 2031 Segment Reporting [Table] Segment Reporting [Table] 2025 Share Repurchase Program 2025 Share Repurchase Program [Member] 2025 Share Repurchase Program Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income Operating Income (Loss) Ewout Steenbergen [Member] Ewout Steenbergen Current Fiscal Year End Date Current Fiscal Year End Date 4.000% Senior Notes Due 2026 4.0% Senior Notes Due November 2026 [Member] 4.0% Senior Notes Due November 2026 Net investment hedges Accumulated Foreign Currency Adjustment Attributable To Parent, Net Investment Hedges [Member] Accumulated Foreign Currency Adjustment Attributable To Parent, Net Investment Hedges [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount 4.500% Senior Notes Due 2039 4.500% Senior Notes Due 2039 4.5% Senior Notes due May 2039 [Member] 4.5% Senior Notes due May 2039 Exercise of stock options and vesting of restricted stock units and performance share units (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Information technology Communications and Information Technology Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Balance Balance AOCI before Tax, Attributable to Parent Quarterly dividends per share declared Common Stock, Dividends, Per Share, Declared Notional Amount, Type [Domain] Notional Amount, Type [Domain] [Domain] for Notional Amount, Type Gross Unrealized Losses / Downward Adjustments Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Equity securities with readily determinable fair values Equity Securities [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Transformation costs Transformation costs Restructuring Costs Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Amortization of debt discount Amortization of Debt Discount (Premium) Entity Information [Line Items] Entity Information [Line Items] Treasury stock, shares (in shares) Treasury Stock (in shares) Treasury Stock (in shares) Treasury Stock, Common, Shares Balance Balance AOCI Tax, Attributable to Parent CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS BY COMPONENT Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Cash paid during the period for income taxes Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date General authorization for shares withheld on stock award vesting (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Federal statutory tax rate, percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Stock split, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets, net Other Assets, Noncurrent Document Type Document Type 4.500% Senior Notes Due 2031 4.5% Senior Notes Due November 2031 [Member] 4.5% Senior Notes Due November 2031 Unrecognized tax benefits, income tax penalties and interest accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 3.6% Senior Notes Due June 2026 3.6% Senior Notes Due June 2026 [Member] 3.6% Senior Notes Due June 2026 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gross Unrealized Losses / Downward Adjustments Long term investment, gross unrealized loss Long term investment, gross unrealized loss Accrued expenses and other current liabilities Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Remaining authorization to repurchase common stock Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Proceeds from the issuance of long-term debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Other comprehensive (loss) income ("OCI") for the period Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Euro-Denominated Debt Euro-Denominated Debt [Member] Euro-Denominated Debt [Member] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (see Note 13) Commitments and Contingencies Total revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Income Tax Contingency [Table] Income Tax Contingency [Table] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] LIABILITIES AND STOCKHOLDERS' DEFICIT Liabilities and Equity [Abstract] Paulo Pisano [Member] Paulo Pisano Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Repurchase of common stock (in shares) Authorized stock repurchase programs (in shares) Treasury Stock, Shares, Acquired Aggregate grant-date fair value of performance share units and restricted stock units granted during the period Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Grant Date Fair Value As of the balance sheet date, the aggregate grant-date fair values of the underlying non-option award shares granted during the period. PEO Name PEO Name Other segment items Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Foreign currency sales Foreign currency sales [Member] Foreign currency sales Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] 3.750% Senior Notes Due 2036 3.750% Senior Notes Due March 2036 [Member] 3.750% Senior Notes Due March 2036 Repurchase of common stock Total Repurchases Treasury Stock, Value, Acquired, Cost Method Product Concentration Risk Product Concentration Risk [Member] Total cash and cash equivalents and restricted cash and cash equivalents, beginning of period Total cash and cash equivalents and restricted cash and cash equivalents, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Merchant revenues Merchant Revenue [Member] Merchant revenues are derived from services where the Company receives payments from travelers for the travel reservation services provided, generally at the time of booking. The Company records cash collected from travelers, which includes the amounts owed to the travel service providers and the Company’s commission or margin and fees, as deferred merchant bookings until the arranged travel service begins. Merchant revenues include net revenues (i.e., the amount charged to travelers less the amount owed to travel service providers) and travel reservation commissions in connection with our accommodation reservations and rental car services; ancillary fees, including damage excess waiver insurance and certain travel insurance fees and certain GDS reservation booking fees; and customer processing fees. Substantially all merchant revenues are for merchant services derived from transactions where travelers book accommodations reservations or rental car reservations from travel service providers at disclosed rates, which are subject to contractual arrangements. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Netherlands Pension Fund Matter Netherlands Pension Fund Matter [Member] Netherlands Pension Fund Matter Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Restricted cash and cash equivalents Restricted Cash and Cash Equivalent, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Reporting Unit [Domain] Reporting Unit [Domain] Stock-based compensation expense Share-based compensation Share-Based Payment Arrangement, Noncash Expense Personnel, including stock-based compensation of $140, $154, $281, and $296, respectively Personnel expenses Labor and Related Expense Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Net income applicable to common stockholders per basic common share (in dollars per share) Earnings Per Share, Basic Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Payments for repurchase of common stock Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt Long-Term Debt, Excluding Current Maturities Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Schedule of Stock Repurchase Activity Class of Treasury Stock [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock Common Stock [Member] Estimated excise tax liability for share repurchases Share Repurchase Program, Excise Tax, Payable Advertising and other revenues Advertising and other revenues [Member] Advertising and other revenues are primarily recognized by KAYAK and OpenTable and to a lesser extent by priceline for advertising placements on its website and Booking.com's BookingSuite branded accommodation marketing and business analytics services. KAYAK recognizes advertising revenue primarily by sending referrals to online travel companies ("OTCs") and travel service providers and from advertising placements on its websites and mobile apps. Revenue related to referrals is recognized when a customer clicks on a referral placement or upon completion of the travel. Revenue for advertising placements is recognized based upon when a customer clicks on an advertisement or when KAYAK displays an advertisement. OpenTable recognizes reservation fees when diners are seated through its online restaurant reservation service and subscription fees for restaurant management services on a straight-line basis over the contractual period in accordance with how the service is provided. Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Other sources of online travel reservation services or advertising and other revenues Other sources of online travel reservation services or advertising and other revenues [Member] Other sources of online travel reservation services or advertising and other revenues Interest expense, debt, coupon interest Interest Expense, Debt, Excluding Amortization Derivative Contract [Domain] Derivative Contract [Domain] Concentration risk percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] Schedule of activity related to the conversion option of the convertible senior notes Convertible Debt [Table Text Block] Total liabilities and stockholders' deficit Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Gains (losses) on foreign currency exchange derivatives Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] 3.000% Senior Notes Due 2030 3.0% Senior Notes due November 2030 [Member] 3.0% Senior Notes due November 2030 Tax (expense) benefit AOCI Including Portion Attributable to Noncontrolling Interest, Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Tax Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Amortization of debt discount and change in fair value of the conversion option related to the convertible senior notes Total charges Debt Instrument, Convertible, Conversion Gains (Losses) Debt Instrument, Convertible, Conversion Gains (Losses) Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Carrying Value Equity Securities, FV-NI, Noncurrent Other income (expense), net Other income (expense), net Other Nonoperating Income (Expense) Reduction of commissions order duration Reduction of commissions order duration Reduction of commissions order duration Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative General and Administrative Expense Adjustment to Compensation: Adjustment to Compensation [Axis] Receivables from payment processors and networks Other Receivables, Gross, Current Goodwill Goodwill [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Other Other General Expense Credit Facility [Axis] Credit Facility [Axis] TRANSFORMATION COSTS Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Assets at fair value Assets, Fair Value Disclosure Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Name Measure Name INCOME TAXES Income Tax Disclosure [Text Block] Unrealized foreign currency transaction (gains) losses related to Euro-denominated debt Foreign currency transaction gains (losses) related to Euro-denominated debt Foreign Currency Transaction Gain (Loss), before tax associated with the remeasurement of non-functional currency debt Foreign Currency Transaction Gain (Loss), before tax associated with the remeasurement of non-functional currency debt Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Debt Instrument Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Organization, Consolidation And Presentation Of Financial Statements [Line Items] Organization, Consolidation And Presentation Of Financial Statements [Line Items] [Line Items] for Organization, Consolidation And Presentation Of Financial Statements [Table] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Name Trading Arrangement, Individual Name Write-offs and other adjustments Accounts Receivable, Allowance for Credit Loss, Write-offs and Other Adjustments, Increase (Decrease) Accounts Receivable, Allowance for Credit Loss, Write-offs and Other Adjustments, Increase (Decrease) Cash and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Reconciliation of segment Adjusted EBITDA less Capex to Income before income taxes Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization KAYAK KAYAK [Member] KAYAK Reporting Unit Unrecognized tax benefits that would impact the effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax expense Income Tax Expense (Benefit) Foreign currency transaction gains (losses) on the remeasurement of certain Euro-denominated debt and accrued interest and gains on debt-related foreign currency derivative instruments Foreign currency transaction gains (losses) Gain (Loss), Foreign Currency Transaction, before Tax Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net increase in cash and cash equivalents and restricted cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 4.000% Senior Notes Due 2044 4.000% Senior Notes Due March 2044 [Member] 4.000% Senior Notes Due March 2044 Total AOCI, net of tax AOCI Attributable to Parent, Net of Tax [Roll Forward] Prepayments to certain accommodation travel service provider customers Prepayments to accommodation travel service provider customers Prepayments to accommodation travel service provider customers Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Changes in the balances of accumulated other comprehensive loss by component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Equity securities of private entities Equity securities, private companies [Member] Equity securities, private companies [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Online accommodation reservation services Online accommodation reservation services [Member] Online accommodation reservation services Loss contingency, number of foundations filing claims on behalf of other parties Loss Contingency, Number Of Foundations Filing Claims On Behalf Of Other Parties Loss Contingency, Number Of Foundations Filing Claims On Behalf Of Other Parties BASIS OF PRESENTATION Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]