Fair Value of Financial Instruments - Narrative (Details) $ in Millions	Sep. 30, 2024 USD ($)
Fair Value Disclosures [Abstract]
Percent of derivative assets using level 3 fair value inputs	7.00%
Percent of financial instruments using level 3 fair value inputs	99.00%
Fair value assets, measured on recurring basis, valuation techniques, impact of credit reserve to fair value	$ 17

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.

No definition available.

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