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Borrowings - Additional information (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2024 CNY (¥) shares | Feb. 01, 2024 USD ($) shares | Jan. 15, 2021 USD ($) shares | Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2024 USD ($) shares | Nov. 30, 2024 CNY (¥) shares | Nov. 30, 2024 USD ($) shares | Nov. 30, 2020 USD ($) shares | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2023 CNY (¥) | Dec. 31, 2025 USD ($) | Feb. 28, 2025 CNY (¥) | Feb. 28, 2025 USD ($) | Dec. 31, 2024 USD ($) | Feb. 29, 2024 CNY (¥) | Feb. 29, 2024 USD ($) | Dec. 31, 2023 USD ($) | Oct. 31, 2023 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares | Jan. 31, 2021 USD ($) $ / shares | Feb. 28, 2019 USD ($)
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  | ¥ 5,729,561 |  |  |  |  | ¥ 4,691,910 |  | ¥ 5,729,561 |  | $ 670,934 |  |  |  |  |  |  |  |  |  |
Sales and leaseback arrangement |  |  |  |  |  |  |  |  | 1,024,395 |  | 157,001 |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments pledged to secure short-term bank borrowings |  |  |  | 0 |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding amount |  |  |  |  |  |  |  |  | 2,712,421 | $ 387,871 | 3,302,213 | ¥ 3,387,648 |  |  |  |  |  |  |  |  |  |  |
Derecognized treasury stock |  |  |  |  |  |  |  |  |  |  | (902,829) |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 73,772,832 |  |  |  |  | 77,756,566 |  | 73,772,832 |  |  |  |  |  |  |  |  |  |  |  |
Non-collateral based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 15,441,290 |  |  |  |  | 7,752,160 |  | 15,441,290 |  |  |  |  |  |  |  |  |  |  |  |
Collateral-based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 58,331,542 |  |  |  |  | 70,004,406 |  | ¥ 58,331,542 |  |  |  |  |  |  |  |  |  |  |  |
Treasury Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding amount | ¥ 1,168,732 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of capped call options and zero strike call options (in shares) | shares | 13,404,825 | 13,404,825 |  |  |  |  |  |  |  |  | 13,404,825 |  |  |  |  |  |  |  |  |  |  |  |
Settlement of capped call options and zero strike call options | ¥ 709,490 |  |  |  |  |  |  |  |  |  | ¥ (709,490) |  |  |  |  |  |  |  |  |  |  |  |
Derecognized treasury stock |  |  |  |  |  |  |  |  |  |  | (2,214,029) |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of capped call options and zero strike call options |  |  |  |  |  |  |  |  |  |  | 709,490 |  |  |  |  |  |  |  |  |  |  |  |
Derecognized treasury stock |  |  |  |  |  |  |  |  |  |  | 1,311,200 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | Non-collateral based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 7,104,500 |  |  |  |  | 2,480,000 |  | 7,104,500 |  |  |  |  |  |  |  |  |  |  |  |
Letters of Guarantee | Non-collateral based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 2,537,005 |  |  |  |  | 690,000 |  | 2,537,005 |  |  |  |  |  |  |  |  |  |  |  |
Letters of Guarantee | Collateral-based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 2,058,607 |  |  |  |  | 8,088,343 |  | 2,058,607 |  |  |  |  |  |  |  |  |  |  |  |
Banker's acceptance | Non-collateral based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 330,000 |  |  |  |  | 237,000 |  | 330,000 |  |  |  |  |  |  |  |  |  |  |  |
Banker's acceptance | Collateral-based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | 16,658,660 |  |  |  |  | 24,447,520 |  | 16,658,660 |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Collateral-based bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility amount |  |  |  |  |  |  |  |  | 102,052 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short Term Borrowings At December 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  | 4,490,000 |  |  |  |  |  |  | ¥ 4,490,000 |  |  |  |  |  |  |  |  |  |  |  |
Short Term Borrowings At December 2023 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.10% |  |  |  |  |  |  |  |  |  |  |  |
Short Term Borrowings At December 2023 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  |  |  |  |  |  |
Short Term Borrowings At December 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |  | ¥ 3,580,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short Term Borrowings At December 2024 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.20% | 2.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Short Term Borrowings At December 2024 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.90% | 2.90% |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 650,000
Additional convertible senior notes | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  | 0.50% |  |  |  | 4.50%
Aggregate principal amount converted | $ |  |  |  |  |  |  |  | $ 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes | Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion | shares |  |  |  |  |  |  |  | 735 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.12 | $ 11.12 | $ 93.06 |
Convertible Notes 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding amount | $ |  | $ 164,520 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes | $ |  |  |  |  |  |  |  |  |  |  |  |  | 578,902 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount converted | $ |  |  | $ 581,685 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion | shares |  |  | 62,192,017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion premium | $ |  |  | $ 56,359 |  |  |  |  |  |  |  |  |  | 56,359 |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes |  |  |  | 6,534 |  |  |  |  | ¥ 6,409 |  | ¥ 6,534 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 |
Portion of notes repurchased |  |  |  | 1,801,685 |  |  |  |  |  |  | 1,801,685 | ¥ 1,317,106 |  |  |  | $ 253,762 | ¥ 2,122,155 | $ 298,689 | $ 190,962 |  |  |  |
Convertible Senior Notes Due 2026 | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of notes to be repurchased for repurchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Convertible Senior Notes Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes |  |  |  | 2,706,285 |  |  |  |  | 1,493 |  | 2,706,285 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 |
Portion of notes repurchased |  |  |  | 1,719,944 |  |  |  |  |  |  | 1,719,944 |  |  | ¥ 2,712,412 | $ 378,312 | $ 242,249 |  |  |  |  |  |  |
Aggregate principal amount converted | $ |  |  |  |  | $ 127,090 |  | $ 127,090 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of convertible notes |  |  |  |  |  |  |  |  | 2,706,285 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate principle amount | $ |  |  |  |  | $ 1,000 |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2027 | Treasury Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derecognized treasury stock |  |  |  | 2,214,029 |  | ¥ 2,214,029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2027 | Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derecognized treasury stock |  |  |  | ¥ 1,311,200 |  | ¥ 1,311,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2027 | ASU 2020-06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term borrowings | $ |  |  |  |  |  |  |  |  |  |  |  |  | 26,340 |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2027 | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion | shares |  |  |  | 27,690,071 | 27,690,071 | 27,690,071 | 27,690,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2027 | Minimum | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rates |  |  |  | 207 | 207 | 207 | 207 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2027 | Maximum | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rates |  |  |  | 227.6 | 227.6 | 227.6 | 227.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capped Call Transactions and Zero-Strike Call Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion | shares |  |  | 16,402,643 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, debt |  |  |  |  |  |  |  |  | 1,849,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 575,000 |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.875% |  |
Convertible Senior Notes, Due 2029 | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of notes to be repurchased for repurchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Convertible Senior Notes, Due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 575,000 |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.625% |  |  |
Convertible Senior Notes, Due 2030 | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of notes to be repurchased for repurchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Convertible Senior Notes Due 2029 and 2030 | ASU 2020-06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes |  |  |  | ¥ 8,160,462 |  |  |  |  | ¥ 7,996,217 |  | ¥ 8,160,462 |  |  |  |  |  |  |  |  |  |  |  |
Long-term borrowings | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,855 |  |  |  |  |  |  |  |  |  |

X
- Definition Amount of the convertible senior notes. + References No definition available. + Details
Name: | nio_AdditionalConvertibleNotesPayable
Namespace Prefix: | nio_
Data Type: | xbrli:monetaryItemType
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