Income Statement [Abstract] Operating Expenses [Abstract] Operating expenses: Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Foreign currency translation adjustments Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized securities holding gains/(losses) Unrealized securities holding gains / (losses) Unrealized securities holding gains / (losses) Total comprehensive income Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest Total Comprehensive income Comprehensive Income, Net of Tax, Attributable to Noncontrolling Interest Less: Comprehensive income attributable to noncontrolling interests Less: Comprehensive income attributable to noncontrolling interests Less: Comprehensive income attributable to noncontrolling interests Comprehensive Income, Net of Tax, Attributable to Parent Comprehensive income attributable to Ctrip's shareholders Comprehensive income attributable to Ctrip's shareholders Earnings Per Share [Abstract] Earnings per ordinary share Business Tax And Related Surcharges Less: business tax and related surcharges Less: business tax and related surcharges Less: business tax and related surcharges Business tax and related surcharges Packaged Tour Revenue Packaged tour revenue. Packaged-tour Air Ticketing Revenue Air ticketing revenue. Air-ticketing Hotel Reservation Revenue Hotel reservation revenue. Hotel reservation Gross Profit Gross profit Gross profit Selling and Marketing Expense Sales and marketing Sales and marketing Sales and marketing General and Administrative Expense General and administrative General and administrative General and Administrative Expense, Total General and administrative Operating Expenses Total operating expenses Total operating expenses Total operating expenses Operating Income (Loss) Income from operations Income from operations Investment Income, Interest Interest income Other Nonoperating Income Other income Other income Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Income before income tax expense, equity in income of affiliates and noncontrolling interests Income before income tax expense and equity in income Income Tax Expense (Benefit) Income tax expense Income Tax Expense (Benefit), Total Income tax expense Income (Loss) from Equity Method Investments Equity in income of affiliates Equity in income of affiliates Equity in income of affiliates Equity in income of affiliates Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net income Net Income (Loss) Attributable to Noncontrolling Interest Less: Net income attributable to noncontrolling interests Less: Net loss / (income) attributable to noncontrolling interests Less: Net income attributable to noncontrolling interests* Net Income (Loss) Attributable to Parent Net income attributable to Ctrip's shareholders Net income attributable to Ctrip's shareholders Earnings Per Share, Basic - Basic - Basic Earnings Per Share, Diluted - Diluted - Diluted Weighted Average Number of Shares Outstanding, Basic - Basic shares - Basic shares Weighted Average Number of Shares Outstanding, Diluted - Diluted shares - Diluted shares Share-based Compensation [Abstract] Share-based compensation included in Operating expense above is as follows: Prepayments And Other Current Assets Prepayments and other current assets. Prepayments and other current assets Statement of Financial Position [Abstract] Balance Sheets Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of year Cash and cash equivalents, beginning of year Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Restricted Cash and Cash Equivalents, Current Restricted cash Short-term Investments Short-term Investments, Total Short-term investment Accounts Receivable, Net, Current Accounts Receivable, Net, Current, Total Accounts receivable, net Due from Related Parties, Current Due from Related Parties, Current, Total Due from related parties Deferred Tax Assets, Net, Current Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred tax assets, current Deferred tax assets, current Assets, Current Total current assets Deposits Assets, Noncurrent Long-term deposits Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Property, equipment and software Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill Assets Total assets Total assets Liabilities [Abstract] LIABILITIES Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts Payable, Current, Total Accounts payable Due to Related Parties, Current Due to Related Parties, Current, Total Due to related parties Employee-related Liabilities, Current Employee-related Liabilities, Current, Total Salary and welfare payable Accrued Income Taxes, Current Taxes payable Customer Advances, Current Advances from customers Liabilities, Current Total current liabilities Total current liabilities Deferred Tax Liabilities, Noncurrent Deferred tax liabilities, non-current Deferred tax liabilities, non-current Liabilities Total liabilities Total liabilities Commitments and contingencies (Note 16) Commitments and Contingencies Shareholders' equity Stockholders' Equity Attributable to Parent [Abstract] Share capital (US$0.01 par value; 100,000,000 shares authorized , 34,054,944 and 35,885,163 share issued and outstanding as of December 31, 2009 and 2010, respectively.) Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive income/(loss) Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Retained earnings Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Total Ctrip's shareholders' equity Total Ctrip's shareholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Noncontrolling interests Noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Total shareholders' equity Total shareholders' equity Liabilities and Stockholders' Equity Total liabilities and shareholders' equity Total liabilities and shareholders? equity Common Stock, Par or Stated Value Per Share Ordinary shares, par value Common Stock, Shares Authorized Share capital, shares authorized Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Share capital, share issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Share capital, share outstanding Statement [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Statement [Line Items] Statutory Reserves Statutory reserves. Statutory reserves Increase In Prepayments And Other Current Assets Increase in prepayments and other current assets Increase in prepayments and other current assets. Consolidated Statements of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to cash provided by operating activities: Foreign Currency Transaction Gain (Loss), Unrealized Foreign exchange gain not related to operating expense Share-based Compensation Share-based Compensation, Total Share-based compensation Provision for Doubtful Accounts Provision for doubtful accounts Cost of Goods Sold, Depreciation Depreciation of property, equipment and software Amortization of Intangible Assets Amortization of Intangible Assets, Total Amortization of intangible assets and land use rights Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Deferred income tax (benefit) provision Gain (Loss) on Sale of Property Plant Equipment Loss from disposal of property, equipment and software Gain (Loss) on Sale of Property Plant Equipment, Total Increase (Decrease) in Operating Capital [Abstract] Changes in current assets and liabilities: Increase (Decrease) in Accounts Receivable Increase in accounts receivable Increase (Decrease) in Due from Related Parties, Current Increase in due from related parties Increase (Decrease) in Due from Related Parties, Current, Total Increase (Decrease) in Deposits Outstanding (Increase) Decrease in long-term deposits Increase (Decrease) in Accounts Payable, Trade Increase (Decrease) in accounts payable Increase (Decrease) in Due to Related Parties, Current Increase (Decrease) in Due to Related Parties, Current, Total Decrease in due to related parties Increase (Decrease) in Employee Related Liabilities Increase (Decrease) in Employee Related Liabilities, Total Increase (Decrease) in salary and welfare payable Increase (Decrease) in Accrued Income Taxes Payable Increase in taxes payable Increase (Decrease) in Customer Advances Increase in advances from customers Increase (Decrease) in Other Accrued Liabilities Increase in accrued liability for customer reward program Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Increase in other payables and accruals Increase in other payables and accruals Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Investments Cash paid for investments Payments to Acquire Investments, Total Cash paid for investments Payments to Acquire Businesses, Net of Cash Acquired Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Cash paid for acquisitions, net of cash acquired Payments to Acquire Intangible Assets Purchase of intangible assets Purchase of intangible assets Increase (Decrease) in Restricted Cash Increase in restricted cash Increase (Decrease) in Restricted Cash, Total Increase in restricted cash Payments for (Proceeds from) Short-term Investments (Increase) Decrease in short-term investment Payments for (Proceeds from) Short-term Investments, Total (Increase) Decrease in short-term investment Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net cash used in investing activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Stock Options Exercised Proceeds from exercise of share option Proceeds from Noncontrolling Interests Cash received from noncontrolling investors Payments of Dividends, Common Stock Dividends paid Dividends paid Net Cash Provided by (Used in) Financing Activities Net cash (used in) provided by financing activities Net cash (used in) provided by financing activities Effect of Exchange Rate on Cash and Cash Equivalents Effect of foreign exchange rate changes on cash and cash equivalents Effect of foreign exchange rate changes on cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, Period Increase (Decrease), Total Net increase in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information Income Taxes Paid, Net Income Taxes Paid, Net, Total Cash paid during the year for income taxes Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental schedule of non-cash investing and financing activities Purchase Of Land Use Right Purchase of land use right Purchase of land use right Purchase of land use right. Capitalization Of Statutory Reserves Capitalization of statutory reserves. Capitalization of statutory reserves Appropriations To Statutory Reserves Appropriations to statutory reserves. Appropriations to statutory reserves Acquisition Of Additional Stake In Subsidiary Acquisition of additional stake in a subsidiary Acquisition of additional stake in a subsidiary Acquisition of additional stake in a subsidiary. Shares, Issued Ending Balance, Shares Beginning Balance, Shares Ending Balance, Shares Stock Issued During Period, Value, Stock Options Exercised Exercise of share option Stock Issued During Period, Shares, Stock Options Exercised Exercise of share option, Shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value Share-based compensation Consolidated Statements of Shareholders' Equity (Parenthetical) [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Total Ctrip's shareholders' equity Ordinary shares Additional paid-in capital Retained earnings Accumulated other comprehensive income/(loss) Other cumulative comprehensive income/(loss) Noncontrolling interests Stock Issued During Period, Value, Acquisitions Acquisition of a subsidiary Acquisition of a subsidiary Organization and Nature of Operations [Abstract] Organization And Nature Of Operations Principal Accounting Policies Abstract Principal Accounting Policies. Principal Accounting Policies Significant Accounting Policies [Text Block] PRINCIPAL ACCOUNTING POLICIES Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Text Block] PREPAYMENTS AND OTHER CURRENT ASSETS Property, Plant and Equipment Disclosure [Text Block] PROPERTY, EQUIPMENT AND SOFTWARE Property, Equipment and Software [Abstract] Property, Equipment And Software Goodwill [Abstract] Goodwill. Commitments and Contingencies [Abstract] Commitments And Contingencies Commitments And Contingencies. Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES Subsequent Events [Abstract] Subsequent Events. Subsequent Events Goodwill and Intangible Assets Disclosure [Text Block] GOODWILL Intangible Assets [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] INTANGIBLE ASSETS Income Tax Disclosure [Text Block] TAXATION Taxation [Abstract] Taxation Pension and Other Postretirement Benefits Disclosure [Text Block] EMPLOYEE BENEFITS Employee Benefits [Abstract] Employee Benefits Related Party Transactions Disclosure [Text Block] RELATED PARTY TRANSACTIONS Related Party Transactions [Abstract] Related Party Transaction, Due from (to) Related Party, Noncurrent, Total Accounts Payable and Accrued Liabilities Disclosure [Text Block] OTHER PAYABLES AND ACCRUALS Other Payables and Accruals [Abstract] Other Payables And Accruals Earnings Per Share [Text Block] EARNINGS PER SHARE Schedule of Subsequent Events [Text Block] SUBSEQUENT EVENTS Land Use Rights [Abstract] Land Use Rights Land Use Rights. Land Use Rights Text Block LAND USE RIGHTS Land Use Rights. Document and Entity Information [Abstract] Document And Entity Information Abstract Document And Entity Information Abstract Statutory Reserves Member Statutory reserves Statutory reserves. Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Antidilutive Securities, Name [Domain] Investments Text Block INVESTMENTS Investments. Amendment Flag Investments [Abstract] Sales Revenue, Services, Net [Abstract] Revenues: Other Revenues Others Other Revenues. Sales Revenue, Services, Net Net revenues Net revenues Cost of Services Cost of revenues Cost of Services, Total Product development Expense Product development Product development Product development Expense. Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income: American Depositary Shares Member American Depositary Shares American Depositary Shares. Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average ordinary shares outstanding Land use rights Land use rights. Land use rights Long-term Investments Long-term Investments, Total Investments Intangible Assets, Net (Excluding Goodwill) Intangible assets Accrued liability for customer reward program Accrued liability for customer reward program. Accrued liability for customer reward program Other payables and accruals Other payables and accruals Other payables and accruals Other payables and accruals. Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' equity Equity in income of affiliates Equity in gain of affiliates Equity in income of affiliates. Payments to Acquire Property, Plant, and Equipment Purchase of property, equipment and software Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Additional Interest in Subsidiaries Disposal of a subsidiary Capital Expenditures Incurred but Not yet Paid Accruals related to purchase of property, equipment and software Other Comprehensive Income, Available-for-sale Securities Adjustment, Net of Tax Other Comprehensive Income, Available-for-sale Securities Adjustment, Net of Tax, Total Transfer of unrealized securities holding losses on obtaining control in the investee Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Disposal of a subsidiary Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] ORGANIZATION AND NATURE OF OPERATIONS Prepayments and Other Current Assets [Abstract] Prepayments and Other Current Assets. Long Term Deposits [Abstract] Long-Term Deposits.