Document and Entity Information Statement [Table] Statement [Line Items] Statement Balance Sheet Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag 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 Document Fiscal Year Focus Document Fiscal Period Focus Consolidated Balance Sheets Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents end of the year Cash and cash equivalents beginning of the year Cash and cash equivalents Cash at bank and demand deposits Represents certificate of deposits or savings account held by a bank or other financial institution for a short-term specified period of time. These investments generally have original maturities of three months or more but less than a year. Time Deposits Short Term Time deposits-short term Time deposits Restricted Cash, Current Restricted cash Restricted cash, current Accounts Receivable, Net, Current Accounts receivable, net Inventory, Net Inventories, net Prepaid Expense and Other Assets, Current Prepayments and other current assets Prepayments and other current assets Short-term Investments. Short-term investments Cost Assets, Current Total current assets Assets, Noncurrent [Abstract] Non-current assets: Property, Plant and Equipment, Net Property, equipment and software, net Net book value The cost of an acquired contractual arrangement associated with the use of land minus accumulated amortization. Land Use Right. Land use right, net Deferred Income Tax Assets, Net Deferred tax assets Total Represents certificate of deposits or savings account held by a bank or other financial institution for a long-term specified period of time. These investments generally have original maturities of more than a year. Time Deposits Long Term Time deposits-long term Time deposits Restricted Cash, Noncurrent Restricted cash, non-current Restricted cash Long-term Investments. Long-term investments Total Other Assets, Noncurrent Other long-term assets Total Assets, Noncurrent Total non-current assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Shareholders' Equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable of the consolidated VIEs without recourse to the primary beneficiaries Accounts payable (including accounts payable of the consolidated VIEs without recourse to the primary beneficiaries of RMB917,264 and RMB941,358 as of December 31, 2016 and 2017, respectively) Employee-related Liabilities, Current Salary and welfare payables (including salary and welfare payables of the consolidated VIEs without recourse to the primary beneficiaries of RMB89,578 and RMB106,265 as of December 31, 2016 and 2017, respectively) Salary and welfare payables of the consolidated VIEs without recourse to the primary beneficiaries Taxes Payable, Current Taxes payable (including taxes payable of the consolidated VIEs without recourse to the primary beneficiaries of RMB43,309 and RMB22,058 as of December 31, 2016 and 2017, respectively) Total taxes payable Taxes payable of the consolidated VIEs without recourse to the primary beneficiaries Short-term Bank Loans and Notes Payable Short-term loans Deferred Revenue, Current Reduction of deferred revenue Deferred revenue (including deferred revenue of the consolidated VIEs without recourse to the primary beneficiaries of RMB7,223,764 and RMB5,853,904 as of December 31, 2016 and 2017, respectively) Deferred revenue of the consolidated VIEs without recourse to the primary beneficiaries Accrued Liabilities, Current Accrued liabilities and other payables (including accrued liabilities and other payables of the consolidated VIEs without recourse to the primary beneficiaries of RMB1,697,195 and RMB1,966,436 as of December 31, 2016 and 2017, respectively) Total accrued liabilities and other payables Accrued liabilities and other payables of the consolidated VIEs without recourse to the primary beneficiaries Liabilities, Current Total current liabilities Liabilities, Noncurrent [Abstract] Long-term payable: Deferred Tax Liabilities, Gross Deferred tax liabilities Other Liabilities, Noncurrent Other long-term payable (including long-term payable of the consolidated VIEs without recourse to the primary beneficiaries of nil and RMB7,500 as of December 31, 2016 and 2017, respectively) Long-term payable of the consolidated VIEs without recourse to the primary beneficiaries Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (See Note 21) Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Redeemable noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' equity: Common Stock, Value, Issued Ordinary shares, US$0.0001 par value: 1,000,300,000 shares authorized, 3,281,480 shares issued and outstanding as of December 31, 2016 and 3,283,217 shares issued and outstanding as of December 31, 2017 Additional Paid in Capital, Common Stock Additional paid-in capital Represents appropriations to certain non-distributable statutory reserves in accordance with laws applicable to the reporting entity, its subsidiaries and consolidated VIEs. The reporting entity and its subsidiaries have to make appropriations from its after-tax profit. Statutory Reserves Statutory reserves Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Retained Earnings (Accumulated Deficit) Retained earnings Increase to retained earnings Stockholders' Equity Attributable to Parent NetEase, Inc's shareholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance Balance Total shareholders' equity Liabilities and Equity Total liabilities, redeemable noncontrolling interests and shareholders' equity Common Stock, Par or Stated Value Per Share Ordinary shares, US$0.0001 par value (in dollars per share) Common Stock, Shares Authorized Ordinary shares, shares authorized Common Stock, Shares, Issued Ordinary shares, shares issued Common Stock, Shares, Outstanding Balance (in shares) Balance (in shares) Ordinary shares, shares outstanding Consolidated Statements of Operations and Comprehensive Income Revenue, Net [Abstract] Net revenues: Sales Revenue, Services, Net Services Sales Revenue, Goods, Net Product Revenue, Net Net revenues Total net revenues Cost of Revenue [Abstract] Cost of revenues Cost of Services Services Cost of Goods Sold Product Cost of Revenue Cost of revenues Total Cost of revenues Gross Profit Gross profit Gross profit Operating Expenses [Abstract] Operating expenses: Selling and Marketing Expense Selling and marketing expenses General and Administrative Expense General and administrative expenses Research and Development Expense Research and development expenses Operating Expenses Total operating expenses Operating Income (Loss) Operating profit Nonoperating Income (Expense) [Abstract] Other income/(expenses): Investment Income, Nonoperating Investment income, net Interest Income, Deposits with Financial Institutions Interest income Foreign Currency Transaction Gain (Loss), before Tax Exchange gains/(losses) Other Nonoperating Income (Expense) Other, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before tax Income Tax Expense (Benefit) Income tax Income tax expenses Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net income Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Net income attributable to redeemable noncontrolling interests Net Income (Loss) Available to Common Stockholders, Basic Net income attributable to the NetEase, Inc.'s shareholders Net income attributable to NetEase, Inc.'s shareholders for basic/dilutive net income per share calculation Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized gains/(losses) on available-for-sale securities, net of tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax Reclassification adjustment for losses on available-for-sale securities recorded in net income, nil of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive income Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to the NetEase, Inc.'s shareholders Earnings Per Share, Basic Net income per share, basic (in CNY and dollars per share) Net income per share, basic The amount of net income (loss) for the period per each American depositary share of common stock or unit outstanding during the reporting period. Earnings Per American Depositary Share, Basic Net income per ADS, basic (in CNY and dollars per share) Earnings Per Share, Diluted Net income per share, diluted (in CNY and dollars per share) Net income per share, diluted The amount of net income (loss) for the period available to each American depositary share of common stock or common unit outstanding during the reporting period and to each American depositary share or unit that would have been outstanding assuming the issuance of common American depositary shares or units for all dilutive potential American depositary common shares or units outstanding during the reporting period. Earnings Per American Depositary Share, Diluted Net income per ADS, diluted (in CNY and dollars per share) Weighted Average Number of Shares Outstanding, Basic Weighted average number of ordinary shares outstanding, basic (in shares) Number of basic American depositary shares or units after adjustment, for contingently issuable American depositary shares or units and other American depositary shares or units not deemed outstanding, which is determined by relating the portion of time within a reporting period that American depositary shares or units have been outstanding to the total time in that period. Weighted Average Number of American Depositary Shares Outstanding, Basic Weighted average number of ADS outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average number of ordinary shares outstanding, diluted (in shares) Weighted average number of ordinary shares outstanding, diluted The average number of American depositary shares or units issued and outstanding that is used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of the issuance of American depositary shares or units in the period. Weighted Average Number of Diluted American Depositary, Shares Outstanding Weighted average number of ADS outstanding, diluted (in shares) Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax Reclassification adjustment for losses on available-for-sale securities recorded in net income, tax Consolidated Statements of Shareholders' Equity Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Ordinary shares Additional Paid In Capital [Member] Additional paid-in capital Treasury Stock [Member] Treasury stock Represents appropriations to certain non-distributable statutory reserves in accordance with laws applicable to the reporting entity. The reporting entity and its subsidiaries have to make appropriations from its after-tax profit. Statutory Reserves [Member] Statutory reserves Accumulated Other Comprehensive Income [Member] Accumulated other comprehensive income Retained Earnings [Member] Retained earnings Noncontrolling Interest [Member] Noncontrolling interests Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Ordinary shares issued upon settlement of restricted share units Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Ordinary shares issued upon settlement of restricted share units (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation Represents appropriations to certain non-distributable statutory reserves in accordance with laws applicable to the countries in which the reporting entity's subsidiaries and variable interest entities operate. Appropriation to statutory reserves Appropriation to statutory reserves Appropriations to general reserve funds and statutory surplus funds The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest but excluding the portion attributable to the mezzanine classified noncontrolling interest. Profit Loss Excluding Net Income Attributable To Mezzanine Classified Noncontrolling Interest Net income attributable to NetEase, Inc. and noncontrolling interest shareholders Treasury Stock, Value, Acquired, Cost Method Repurchase of shares Value of shares repurchased Treasury Stock, Shares, Acquired Repurchase of shares (in shares) Shares repurchased (in shares) Treasury Stock, Retired, Cost Method, Amount Cancellation of treasury stock Treasury Stock, Shares, Retired Cancellation of treasury stock (in shares) Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net change in unrealized gains on available-for-sale securities Total net unrealized gains (losses) (net of tax) recorded in other comprehensive income Represents an increase in noncontrolling interest from injections of capital from non-controlling shareholders. Minority Interest Increase from Capital Contributions Capital injection in subsidiaries by noncontrolling interest shareholders Dividends, Common Stock, Cash Dividends to shareholders Cash dividend declared and paid Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock Exchanges losses on repurchase of redeemable noncontrolling interests Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax Foreign currency translation adjustment Noncontrolling Interest, Decrease from Deconsolidation Deconsolidation of a subsidiary Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Cost-method Investments, Other than Temporary Impairment Investment impairment Impairment charges of certain cost method investments Impairment provision Share-based Compensation. Share-based compensation cost Provision for Doubtful Accounts Allowance for provision for doubtful accounts Charged to (write-back against) cost and expenses Gain (Loss) on Disposition of Property Plant Equipment Loss on disposal of property, equipment and software Foreign Currency Transaction Gain (Loss), Unrealized Unrealized exchange (gains)/losses Gain on Sale of Investments Gain on disposal of long-term investments Gain related to the partial disposal of the Group's investment in an equity investee Deferred Income Taxes and Tax Credits Deferred income taxes Income (Loss) from Equity Method Investments Net equity share of losses from associated companies Amount of expense (income) related to adjustment to fair value of short-term investments. Fair value changes of short-term investments Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Expense and Other Assets Prepayments and other current assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Employee Related Liabilities Salary and welfare payables Increase (Decrease) in Accrued Taxes Payable Taxes payable Increase (Decrease) in Deferred Revenue Deferred revenue Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Accrued liabilities and other payables Net Cash Provided by (Used in) Operating Activities Net cash provided by/(used in) 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 Property, Plant, and Equipment Purchase of property, equipment and software Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property, equipment and software Payments to Acquire Intangible Assets Purchase of intangible assets and licensed copyrights of music content Payments to Acquire Land Held-for-use Purchase of land use right Represents the net cash inflow (outflow) of short-term investments with terms of three months or less during the period. Increase Decrease in Short Term Investments with Terms of Three Months or Less Net change of short-term investments with terms of three months or less Payments to Acquire Short-term Investments Purchase of short-term investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Proceeds from maturities of short-term investments Payments to Acquire Interest in Subsidiaries and Affiliates Investment in an associated company The cash outflow for securities or other assets acquired, which are not separately disclosed, qualify for treatment as an investing activity and are to be liquidated, if necessary, beyond the current operating cycle. Includes, but is not limited to, equity investments and available-for-sale securities. Payments to Acquire Other Long-term Investments Acquisitions of other long-term investments The cash inflow associated with the amount received from the disposal of investment in associated company and long-term investments. Proceeds from Disposal of Investment in Associated Company and Long-term Investments Proceeds from disposal of investment in associated company and long-term investments Increase (Decrease) in Restricted Cash Transfer to restricted cash Represents the cash outflow or inflow during the reporting period in the matured time deposits. Increase (Decrease) in Placement or Rollover of Matured Time Deposits Placement/rollover of matured time deposits Represents cash inflow during the reporting period from upliftment of matured time deposits. Proceeds from Matured Time Deposits Proceeds from maturity of time deposits Payments for (Proceeds from) Other Investing Activities Change in other assets Net Cash Provided by (Used in) Investing Activities Net cash (used in)/provided by investing activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Bank Debt Proceeds of short-term bank loans Repayments of Bank Debt Payment of short-term bank loans Payments of Ordinary Dividends, Common Stock Dividends paid to shareholders Proceeds from (Repurchase of) Redeemable Preferred Stock Capital (repurchase of)/injection from redeemable noncontrolling interests shareholders Total cash consideration from issuance of redeemable noncontrolling interest Proceeds from Noncontrolling Interests Capital injection from noncontrolling interest shareholders Cash consideration from issuance of noncontrolling interests Payments for Repurchase of Common Stock Repurchase of shares Net Cash Provided by (Used in) Financing Activities Net cash (used in)/provided by financing activities Net cash used in financing activities Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rate changes on cash held in foreign currencies Cash and Cash Equivalents, Period Increase (Decrease) Net increase/(decrease) in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Income Taxes Paid, Net Cash paid for income taxes, net of tax refund Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental schedule of non-cash investing and financing activities: Capital Expenditures Incurred but Not yet Paid Fixed asset purchases financed by accounts payable Organization and Nature of Operations The entire disclosure for the organization, consolidation and nature of operations of the reporting entity. Organization Consolidation and Nature of Operations [Text Block] Organization and Nature of Operations Principal Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Principal Accounting Policies Concentrations and Risks Concentration Risk Disclosure [Text Block] Concentrations and Risks Allowance for Doubtful Accounts The entire disclosure for allowance for doubtful accounts. Allowance for Doubtful Accounts Disclosure [Text Block] Allowance for Doubtful Accounts Prepayments and Other Current Assets