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Deferred Revenue/Income - Additional information (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Deferred Revenue/Income |  |
Unrecognized deferred revenue | ¥ 6,019,930 | ¥ 6,202,276

X
- Definition The amount of unrecognized deferred revenue at the balance sheet date. + References No definition available. + Details
Name: | nio_UnrecognizedDeferredRevenue
Namespace Prefix: | nio_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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