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Prepaid Expenses (Details) ¥ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)
Prepaid Expenses (Textual)
Percentage of funds raised	2.00%	2.00%
Consulting fee	$ 1,500,000	¥ 9.2
Percentage of funds actually contributed	2.00%	2.00%
Prepaid consulting expense	$ 710,000		$ 650,000
Prepaid tax	$ 34,026		$ 32,050

X

- Definition

The payment of consulting fee during the reporting period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The percentage of funds actually contributed as annual management fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	creg_
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X

- Definition

The percentage of funds raised during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	creg_
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X

- Definition

The amount of prepaid consulting expenses as of the balance sheet date.

+ References

No definition available.

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Namespace Prefix:	creg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

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X

- Definition

Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (g)(4)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section 05
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5865-108316

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 340
-SubTopic 10
-Section 05
-Paragraph 5
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