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Related Party Balances and Transactions - Purchase of equity investee (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
Related Party Balances and Transactions |  |  |  |  |
Purchase of equity investee | ¥ 279,043 | $ 40,457 | ¥ 592,570 |  | ¥ 250,826
Weilan |  |  |  |  |
Related Party Balances and Transactions |  |  |  |  |
Purchase of equity investee |  |  |  | $ 50,000 |

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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=nio_NingboMeishanFreeTradePortZoneWeilanInvestmentCo.Ltd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |