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Organization and Nature of Operations - Subsidiaries (Details) | Dec. 31, 2025 | Jul. 31, 2025 | Dec. 31, 2024 | Sep. 29, 2024
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NIO Nextev Limited ("NIO HK") (formerly known as Nextev Limited) |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO GmbH (formerly known as NextEV GmbH) |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Co., Ltd. ("NIO SH") (formerly known as NextEV Co., Ltd.) |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO USA, Inc. ("NIO US") (formerly known as NextEV USA, Inc.) |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
XPT Limited ("XPT") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
XPT (Jiangsu) Investment Co., Ltd. ("XPT Jiangsu") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
XPT Holding (Anhui) Co., Ltd. |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
XPT EDS (Hefei) Co., Ltd. |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Power Express Limited ("PE HK) |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO User Enterprise Limited ("UE HK") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Sales and Services Co., Ltd. ("UE CNHC") (formerly known as Shanghai NIO Sales and Service Co., Ltd.) |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Energy Investment (Hubei) Co., Ltd. ("PE CNHC") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  | 100.00% |
Wuhan NIO Energy Co., Ltd. ("PE WHJV") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Holding Co., Ltd. ("NIO China") (formerly known as NIO (Anhui) Holding Co., Ltd.) |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% | 91.80% | 100.00% | 88.25%
XPT (Jiangsu) Automotive Technology Co., Ltd. ("XPT AUTO") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Financial Leasing Co., Ltd. ("NIO Leasing") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO (Anhui) Co., Ltd. ("NIO AH") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Technology (Anhui) Co., Ltd. ("NIO R&D") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
New Horizon B.V. |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO Nextev Europe Holding B.V.("NIO NL") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NEU Battery Asset Co., Ltd. ("BAC Cayman") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
Instant Power Europe B.V. Co., Ltd. ("BAC NL") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NEU Battery Asset (Hong Kong) Co., Ltd. ("BAC HK") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
GeniTech Co., Ltd |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 100.00% |  |  |
NIO AI Technology Limited ("NIO AI Technology") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 96.97% |  |  |
NIO AI Technology Limited |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 96.97% |  |  |
Anhui NIO Autonomous Driving Technology Co., Ltd. ("Anhui NIO AD") |  |  |  |
Organization and Nature of Operations |  |  |  |
Equity interest held | 96.97% |  |  |

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