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Concentration and Risks - Additional Information (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Concentration and Risks |  |
Cash, cash equivalents and restricted cash subject to currency conversion controls | ¥ 22,634,977 | ¥ 19,902,484

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- Definition The amount of cash, cash equivalents and restricted cash that is subject to governmental controls on the convertibility of currency. + References No definition available. + Details
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Namespace Prefix: | nio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration