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v3.23.3

Statutory Reserves (Details) | 6 Months Ended
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Jun. 30, 2023 USD ($) | Jun. 30, 2022 CNY (¥)
Statutory Reserves (Details) [Line Items] |  |
Least statutory reserve | 10.00% |
Statutory reserve |  |
PRC [Member] |  |
Statutory Reserves (Details) [Line Items] |  |
Statutory reserve requirement | 50.00% |

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- Definition Statutory reserve reqirement. + References No definition available. + Details
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Namespace Prefix: | ck0001872302_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ck0001872302_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition least statutory reserve. + References No definition available. + Details
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Namespace Prefix: | ck0001872302_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |