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

X
- 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