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Fair Value of Financial Instruments - Narrative (Details) $ in Millions	Sep. 30, 2020 USD ($)
Fair Value Disclosures [Abstract]
Percent of derivative liabilities using level 3 fair value inputs	9.00%
Fair value assets, measured on recurring basis, valuation techniques, impact of credit reserve to fair value	$ 10

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- Definition

This element represents the increase (decrease) to fair value from applying a credit reserve to reflect credit risk on the valuation techniques used to measure fair value of Level 2 and 3 derivative contracts which is calculated based on credit default swaps.

+ References

No definition available.

+ Details

Name:	cwen_FairValueAssetsMeasuredOnRecurringBasisValuationTechniquesImpactOfCreditReserveToFairValue
Namespace Prefix:	cwen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Percent of Derivative Liabilities Using Level 3 Fair Value Inputs

+ References

No definition available.

+ Details

Name:	cwen_PercentofDerivativeLiabilitiesUsingLevel3FairValueInputs
Namespace Prefix:	cwen_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration