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Summary of Significant Accounting Policies - Schedule of Depreciation of Fixed Asset Over Estimated Lives (Details) | Sep. 30, 2025
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Schedule of Depreciation of Fixed Asset Over Estimated Lives [Abstract] |
Software | 10 years

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

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant