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Supplemental Financial Information - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Supplemental Balance Sheet Information [Line Items]
Accounts payable	$ 1,302	$ 1,302
Compensation-related accruals	797	680
Taxes accrued	219	399
Nuclear PTCs
Supplemental Balance Sheet Information [Line Items]
Estimated nuclear PTCs credits used	140
Constellation Energy Generation, LLC
Supplemental Balance Sheet Information [Line Items]
Accounts payable	1,286	1,289
Compensation-related accruals	555	576
Taxes accrued	$ 201	$ 390

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for payroll, employee benefits, incentive compensation and vacation. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Supplemental Balance Sheet Information.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Section S99
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Amount of decrease in liability from government assistance.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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