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Other Receivables (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Receivables [Abstract] |  |  |
Advance to third party | $ 7,739 | $ 7,663 | $ 7,167
Advance to employees | 8,742 | 11,011 |
Advance to suppliers | 2,786 | 4,791 |
Other receivables | 12,269 | 12,222 | 22,449
Social insurance receivable | $ 4,625 | 4,579 |
Social insurance |  | $ 4,579 |
Tax and maintenance cost receivable |  |  | $ 1,001,527

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- Definition Amount of advance to employees. + References No definition available. + Details
Name: | creg_AdvanceToEmployees
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Advance to suppliers. + References No definition available. + Details
Name: | creg_AdvanceToSuppliers
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition It represent the value of third party advance. + References No definition available. + Details
Name: | creg_AdvanceToThirdParty
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition It represent the value of social insurance. + References No definition available. + Details
Name: | creg_SocialInsurance
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition SocialInsuranceReceivable. + References No definition available. + Details
Name: | creg_SocialInsuranceReceivable
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Tax and maintenance cost receivable. + References No definition available. + Details
Name: | creg_TaxAndMaintenanceCostReceivable
Namespace Prefix: | creg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount due from parties in nontrade transactions, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherReceivables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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