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Summary of Significant Accounting Policies - Credit loss provision for the current and non-current assets (Details) link:presentationLink link:calculationLink link:definitionLink 99940204 - Disclosure - Summary of Significant Accounting Policies - Property, plant and equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 99940205 - Disclosure - Summary of Significant Accounting Policies - Intangibles through impairment (Details) link:presentationLink link:calculationLink link:definitionLink 99940207 - Disclosure - Summary of Significant Accounting Policies - Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 99940208 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 99940401 - Disclosure - Concentration and Risks (Details) link:presentationLink link:calculationLink link:definitionLink 99940902 - Disclosure - Long-term investments - 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Disclosure - Ordinary Shares (Details) link:presentationLink link:calculationLink link:definitionLink 99942201 - Disclosure - Share-based Compensation - Expense allocation (Details) link:presentationLink link:calculationLink link:definitionLink 99942202 - Disclosure - Share-based Compensation - Nio Incentive Plans - Text and Options (Details) link:presentationLink link:calculationLink link:definitionLink 99942203 - Disclosure - Share-based Compensation - Nio Incentive Plans - Options Assumptions and Unrecognized (Details) link:presentationLink link:calculationLink link:definitionLink 99942204 - Disclosure - Share-based Compensation - Nio Incentive Plans - Restricted Shares (Details) link:presentationLink link:calculationLink link:definitionLink 99942205 - Disclosure - Share-based Compensation - Share-based compensation of subsidiaries (Details) link:presentationLink link:calculationLink link:definitionLink 99942301 - Disclosure - Taxation (Details) link:presentationLink link:calculationLink link:definitionLink 99942304 - 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Sales of raw materials or long-lived assets (Details) link:presentationLink link:calculationLink link:definitionLink 99942506 - Disclosure - Related Party Balances and Transactions - Convertible notes issued to related parties and interest accrual (Details) link:presentationLink link:calculationLink link:definitionLink 99942507 - Disclosure - Related Party Balances and Transactions - Proceeds from borrowings from related parties and interest accrual (Details) link:presentationLink link:calculationLink link:definitionLink 99942508 - Disclosure - Related Party Balances and Transactions - Due from related parties (Details) link:presentationLink link:calculationLink link:definitionLink 99942509 - Disclosure - Related Party Balances and Transactions - Due to related parties, current (Details) link:presentationLink link:calculationLink link:definitionLink 99942510 - Disclosure - Related Party Balances and Transactions - Amount due to related parties, non-current (Details) link:presentationLink link:calculationLink link:definitionLink 99942701 - 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