Document And Entity Information [Abstract] Entity Registrant Name Entity Central Index Key Trading Symbol Entity Current Reporting Status Entity Filer Category Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Common Stock, Shares Outstanding Entity Voluntary Filers Document Type Document Period End Date Amendment Flag Document Fiscal Year Focus Document Fiscal Period Focus Entity Shell Company Entity Emerging Growth Company Statement of Financial Position [Abstract] Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Series A1 And A2 Convertible Redeemable Preferred Shares [Member] Series A-1 & A-2 Series A-1 and A-2 convertible redeemable preferred shares This member stands for Series A1 and A2 convertible redeemable preferred shares. Series A-3 convertible redeemable preferred shares Series A-3 Series A-3 convertible redeemable preferred shares This member stands for Series A3 convertible redeemable preferred shares. Series B Convertible Redeemable Preferred Shares [Member] Series B Series B convertible redeemable preferred shares This member stands for Series B convertible redeemable preferred shares Series C Convertible Redeemable Preferred Shares [Member] Series C Series C convertible redeemable preferred shares This member stands for Series C convertible redeemable preferred shares. Series D Convertible Redeemable Preferred Shares [Member] Series D Series D convertible redeemable preferred shares This member stands for Series D convertible redeemable preferred shares. Series A1 Convertible Redeemable Preferred Shares [Member] Series A-1 Series A-1 convertible redeemable preferred shares Common Class A [Member] Class A Ordinary Shares Common Class B [Member] Class B Ordinary Shares Common Class C [Member] Class C Ordinary Shares Statement [Line Items] Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents at beginning of the year Cash and cash equivalents at end of the year Restricted Cash and Cash Equivalents, Current Restricted cash Short-term Investments Short-term investment Short-term investments Receivables, Net, Current Trade receivable Due from Related Parties, Current Amounts due from related parties Inventory, Net Inventory Total Prepaid Expense and Other Assets, Current Prepayments and other current assets Total Assets, Current Total current assets Total current assets Assets, Noncurrent [Abstract] Non-current assets: Restricted Cash and Cash Equivalents, Noncurrent Long-term restricted cash Property, Plant and Equipment, Net Property, plant and equipment, net Total property, plant and equipment, net Finite-Lived Intangible Assets, Net Intangible assets, net Net carrying value Land Use Rights, Net Land use rights, net Total land use rights, net Represents amount for total net land use rights. Total land use rights, net Long-term Investments Long-term investments Due from Related Parties, Noncurrent Amounts due from related parties Other Assets, Noncurrent Other non-current assets Total Assets, Noncurrent Total non-current assets Total non-current assets Assets Total assets Total assets Liabilities [Abstract] LIABILITIES Liabilities, Current [Abstract] Current liabilities: Short-term Debt Short-term borrowings Accounts Payable, Current Trade payable Due to Related Parties, Current Amounts due to related parties Taxes Payable, Current Taxes payable Long-term Debt, Current Maturities Current portion of long-term borrowings Current portion of long-term borrowings Accounts Payable and Accrued Liabilities, Current Accruals and other liabilities Total Liabilities, Current Total current liabilities Total current liabilities Liabilities, Noncurrent [Abstract] Non-current liabilities: Long-term Debt, Excluding Current Maturities Long-term borrowings Total Other Liabilities, Noncurrent Other non-current liabilities Total Liabilities, Noncurrent Total non-current liabilities Total non-current liabilities Liabilities Total liabilities Total liabilities Commitments and Contingencies Commitments and contingencies (Note 28) Temporary Equity [Abstract] MEZZANINE EQUITY Temporary Equity, Receivable From Holder Outstanding consideration Receivable from a holder Represent amount of convertible redeemable preferred shares receivable from a holders. Receivable from a holder Redeemable Noncontrolling Interest, Equity, Carrying Amount Redeemable non-controlling interests Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Total mezzanine equity Accretion on redeemable non-controlling interests to redemption value Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] SHAREHOLDERS' (DEFICIT)/EQUITY Common Stock, Value, Issued Ordinary shares Ordinary shares Treasury Stock, Value Treasury shares Treasury shares Additional Paid in Capital Additional paid in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income/(loss) Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Total NIO Inc. shareholders' (deficit)/equity Balance Balance Stockholders' Equity Attributable to Noncontrolling Interest Non-controlling interests Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total shareholders' deficit Total shareholders' (deficit)/equity Balance Balance Liabilities And Stockholders Equity Total liabilities, mezzanine equity and shareholders' deficit Total liabilities, mezzanine equity and shareholders' (deficit)/equity Total liabilities, mezzanine equity and shareholders' equity Temporary Equity, Par or Stated Value Per Share Mezzanine equity, par value (in dollars per share) Convertible redeemable preferred shares, per share Temporary Equity, Shares Authorized Mezzanine equity, shares authorized Temporary Equity, Shares Issued Mezzanine equity, shares issued Balances (in shares) Balances (in shares) Temporary Equity, Shares Outstanding Mezzanine equity, shares outstanding Common Stock, Par or Stated Value Per Share Ordinary shares, par value (in dollars per share) Ordinary shares, 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 Ordinary shares, shares outstanding Statement of Comprehensive Income [Abstract] Product and Service [Axis] Product and Service [Domain] Vehicle Sales [Member] Vehicle sales This member represent information about vehicle sales. Other Sales [Member] Other sales This member represents information about other sales. Revenues [Abstract] Revenues: Revenue from Contract with Customer, Including Assessed Tax Revenue by source Vehicle sales and other sales revenue Revenues Total revenues Total revenues Total revenues Cost of Revenue [Abstract] Cost of sales: Cost of Goods and Services Sold Vehicle sales and other sales cost of sales Vehicle sales and other sales cost of sales Cost of Revenue Total cost of sales Total cost of sales Gross Profit Gross loss Gross loss Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development Total Research and development Total Selling, General and Administrative Expense Selling, general and administrative Total Selling, general and administrative Total Operating Expenses Total operating expenses Total operating expenses Total operating expenses Total operating expenses Operating Income (Loss) Loss from operations Loss from operations Loss from operations Investment Income, Interest Interest income Interest income Interest Expense Interest expenses Interest expenses Gain (Loss) on Investments Share of losses of equity investees Share of losses of equity investee Investment Income, Nonoperating, Total Investment income Investment income Other Nonoperating Income (Expense) Other income/(loss), net Other income/(loss), net Other loss, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before income tax expense Loss before income tax expense Loss before income tax expense Loss before income tax expense Income Tax Expense (Benefit) Income tax expense Current income tax expense Income tax expense Income tax expense Profit Loss Net loss Net loss Net loss Net loss Accretion On Convertible Redeemable Preferred Shares To Redemption Value Adjustment Accretion on convertible redeemable preferred shares to redemption value Accretion on convertible redeemable preferred shares to redemption value Amount of decrease to net income for convertible redeemable preferred shares to redemption value to derive net income apportioned to common stockholders. Accretion on convertible redeemable preferred shares to redemption value Accretion on convertible redeemable preferred shares to redemption value Temporary Equity, Accretion to Redemption Value, Adjustment Accretion on redeemable non-controlling interests to redemption value Accretion on redeemable non-controlling interests to redemption value Accretion on redeemable non-controlling interests to redemption value Accretion on redeemable non-controlling interests to redemption value Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to non-controlling interests Net loss attributable to non-controlling interests Net loss attributable to non-controlling interests Net loss attributable to non-controlling interests Net Income (Loss) Available to Common Stockholders, Basic, Total Net loss attributable to ordinary shareholders of NIO Inc. for basic/dilutive net loss per share Net loss attributable to ordinary shareholders of NIO Inc. Net loss attributable to ordinary shareholders of NIO Inc. for basic/dilutive net loss per share Net loss attributable to ordinary shareholders of NIO Inc. Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income/(loss) Foreign currency translation adjustment Foreign currency translation adjustment (gains)/losses Foreign currency translation adjustment, net of nil tax Foreign currency translation adjustment, net of nil tax Foreign currency translation adjustment (gains)/losses Foreign currency translation adjustment Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income/(loss) Total other comprehensive income/(loss) Total other comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive loss Total comprehensive loss Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss attributable to ordinary shareholders of NIO Inc. Comprehensive loss attributable to ordinary shareholders of NIO Inc. Comprehensive loss attributable to ordinary shareholders of NIO Inc. Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of ordinary shares used in computing net loss per share Weighted average number of ordinary shares used in computing net loss per share Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted-average number of ordinary shares outstanding - basic and diluted Basic and diluted (in shares) Earnings Per Share, Basic and Diluted [Abstract] Net loss per ADS attributable to ordinary shareholders Net loss per share attributable to ordinary shareholders Earnings Per Share, Basic and Diluted Basic and diluted net loss per share attributable to ordinary shareholders of NIO Inc. Basic and diluted Basic and diluted net loss per share attributable to ordinary shareholders of NIO Inc. Weighted Average Number Of American Depository Shares Outstanding [Abstract] Weighted average number of ADS used in computing net loss per ADS Weighted average number of ordinary shares used in computing net loss per share Weighted Average Number Of American Depository Shares Outstanding Weighted-average number of ordinary shares outstanding - basic and diluted (in shares) Basic and diluted (in shares) Represents the weighted average number of american depository shares (ADS) outstanding. Net Loss Per Ads Attributable To Ordinary Shareholders [Abstract] Net loss per ADS attributable to ordinary shareholders Net loss per share attributable to ordinary shareholders Earnings Loss Per American Depository Share Basic And Diluted Basic and diluted net loss per share attributable to ordinary shareholders of NIO Inc. Basic and diluted Represents the earnings (loss) per american depository share (ADS), basic and diluted. Basic and diluted net loss per share attributable to ordinary shareholders of NIO Inc. (in dollars per share) Statement of Stockholders' Equity [Abstract] SHAREHOLDERS' DEFICIT Equity Components [Axis] Common Stock [Member] Ordinary Shares Treasury Stock [Member] Treasury Shares Additional Paid-in Capital [Member] Additional paid in capital AOCI Attributable to Parent [Member] Accumulated other comprehensive income/(loss) Retained Earnings [Member] Accumulated deficit Parent [Member] Total Shareholders' Deficit Noncontrolling Interest [Member] Non- Controlling Interests Equity Component [Domain] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares, Issued Shares issued Balance (in shares) Balance (in shares) Temporary Equity Accretion To Redemption Value Preferred Shares Accretion on convertible redeemable preferred shares to redemption value Value of accretion of temporary equity to its redemption value during the period. Temporary Equity Carrying Amount To Noncontrolling Interests carrying amount, attributable to parent and noncontrolling interestsRepresents Accretion on redeemable non-controlling interests to redemption value Stock Issued During Period, Value, New Issues Issuance of ordinary shares Stock Issued During Period, Shares, New Issues Issuance of ordinary shares (in shares) Number of newly issued ordinary shares Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of preferred shares Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of preferred shares (in shares) Stock Issued During Period, Value, Stock Options Exercised Exercise of share options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of share options (in shares) Exercised Exercised Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Vesting of restricted shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Vesting of restricted shares (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition Vesting of share options Stock Issued During Period Value Restricted Stock Granted Grant of restricted shares Value of stock related to restricted Stock Awards granted during the period. Stock Issued During Period Shares Restricted Stock Granted Grant of restricted shares (in shares) Number of shares related to Restricted stock award granted during the period. Stock Cancelled During Period Value Restricted Stock Granted Cancellation of restricted shares Value of stock related to restricted Stock Awards cancelled during the period. Stock Cancelled During Period Shares Restricted Stock Granted Cancellation of restricted shares (in shares) Number of shares related to Restricted stock award cancelled during the period. Minority Interest, Capital Injection By Non Controlling Interests Capital injection by non-controlling interests Represents amount of capital injection by non-controlling interests. Noncontrolling Interest, Increase from Subsidiary Equity Issuance Acquisition of additional interests in subsidiaries from non-controlling interests Acquisition of additional interests in subsidiaries from non-controlling interests Statement of Cash Flows [Abstract] Series A Convertible Redeemable Preferred Shares [Member] Series A convertible redeemable preferred shares Series A This member stands for Series A convertible redeemable preferred shares. 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 loss to net cash used in operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Foreign Currency Transaction Gain (Loss), Unrealized Foreign exchange loss Share-based Compensation Share-based compensation expenses Total Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee Share of losses of equity investee Gain (Loss) on Disposition of Property Plant Equipment Loss on disposal of property, plant and equipment Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepayments and other current assets Prepayments and other current assets Increase (Decrease) in Inventories Inventory Increase (Decrease) in Other Noncurrent Assets Other non-current assets Increase (Decrease) in Income Taxes Taxes payable Increase Decrease In Trade Receivable Trade receivable The increase (decrease) during the reporting period in amount of trade receivable. Trade receivable Increase Decrease In Trade Payable Trade payable The increase (decrease) during the reporting period in amount of trade payable. Increase (Decrease) in Long-term Receivables, Current Long-term receivables Long-term receivables Increase (Decrease) in Deferred Revenue Non-current deferred revenue Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Accruals and other liabilities Increase (Decrease) in Other Noncurrent Liabilities Other non-current liabilities Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES Payments To Acquire Property Plant And Equipment And Intangible Assets The cash outflow associated with the acquisition of long-lived, physical assets and intangible assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Purchase of property, plant and equipment and intangible assets Payments to Acquire Short-term Investments Purchases of short-term investments Purchases of short-term investments Proceeds from Sale of Short-term Investments Proceeds from sale of short-term investments Payments to Acquire Trading Securities Held-for-investment Purchase of held for trading securities Purchase of held for trading securities Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment Sale of held for trading securities Proceeds from sale of trading securities Payments to Fund Long-term Loans to Related Parties Loan to related parties Loan to related party Loan to related parties Proceeds from Collection of Long-term Loans to Related Parties Loan repayment from related parties Payments to Acquire Equity Method Investments Acquisitions of equity investees Acquisitions of equity investees Payments to Acquire Additional Interest in Subsidiaries Acquisition of additional interests in subsidiaries from non-controlling interests Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net cash provided by/(used in) investing activities Net cash provided by/(used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from (Repurchase of) Equity Repurchase of ordinary shares Proceeds from Stock Options Exercised Proceeds from exercise of stock options Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of convertible redeemable preferred shares, net of issuance costs