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Fair Value of Financial Instruments - Narrative (Details) $ in Millions | Sep. 30, 2020 USD ($)
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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