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Revenue from Contracts with Customers - Narrative (Details) $ in Millions	3 Months Ended
	Jun. 30, 2023 USD ($)
Revenue from Contract with Customer [Abstract]
ZEC revenue recognized	$ 218

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- Definition

Revenue Recognized, Zero Emissions Credits Receivable

+ References

No definition available.

+ Details

Name:	ceg_RevenueRecognizedZeroEmissionsCreditsReceivable
Namespace Prefix:	ceg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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